t4 dna polymerase  (Thermo Fisher)


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    Structured Review

    Thermo Fisher t4 dna polymerase
    Single-stranded DNA ligation with <t>T4</t> DNA ligase and CircLigase. A pool of 60 nt acceptor oligonucleotides (‘60N’) were ligated to 10 pmol of a 3΄ biotinylated donor oligonucleotide (CL78) using either T4 DNA ligase in the presence of a splinter oligonucleotide (TL38) or CircLigase. Ligation products were visualized on a 10% denaturing polyacrylamide gel stained with SybrGold. Band shifts from 60 nt to 80 nt indicate successful ligation. Schematic overviews of the reaction schemes are shown on top. The scheme developed by Kwok et al . ( 19 ) is shown for comparison. M: Single-stranded DNA size marker.
    T4 Dna Polymerase, supplied by Thermo Fisher, used in various techniques. Bioz Stars score: 92/100, based on 165 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/result/t4 dna polymerase/product/Thermo Fisher
    Average 92 stars, based on 165 article reviews
    Price from $9.99 to $1999.99
    t4 dna polymerase - by Bioz Stars, 2020-05
    92/100 stars

    Images

    1) Product Images from "Single-stranded DNA library preparation from highly degraded DNA using T4 DNA ligase"

    Article Title: Single-stranded DNA library preparation from highly degraded DNA using T4 DNA ligase

    Journal: Nucleic Acids Research

    doi: 10.1093/nar/gkx033

    Single-stranded DNA ligation with T4 DNA ligase and CircLigase. A pool of 60 nt acceptor oligonucleotides (‘60N’) were ligated to 10 pmol of a 3΄ biotinylated donor oligonucleotide (CL78) using either T4 DNA ligase in the presence of a splinter oligonucleotide (TL38) or CircLigase. Ligation products were visualized on a 10% denaturing polyacrylamide gel stained with SybrGold. Band shifts from 60 nt to 80 nt indicate successful ligation. Schematic overviews of the reaction schemes are shown on top. The scheme developed by Kwok et al . ( 19 ) is shown for comparison. M: Single-stranded DNA size marker.
    Figure Legend Snippet: Single-stranded DNA ligation with T4 DNA ligase and CircLigase. A pool of 60 nt acceptor oligonucleotides (‘60N’) were ligated to 10 pmol of a 3΄ biotinylated donor oligonucleotide (CL78) using either T4 DNA ligase in the presence of a splinter oligonucleotide (TL38) or CircLigase. Ligation products were visualized on a 10% denaturing polyacrylamide gel stained with SybrGold. Band shifts from 60 nt to 80 nt indicate successful ligation. Schematic overviews of the reaction schemes are shown on top. The scheme developed by Kwok et al . ( 19 ) is shown for comparison. M: Single-stranded DNA size marker.

    Techniques Used: DNA Ligation, Ligation, Staining, Marker

    Library preparation methods for highly degraded DNA. ( A ) In the single-stranded library preparation method described here (ssDNA2.0), DNA fragments (black) are 5΄ and 3΄ dephosphorylated and separated into single strands by heat denaturation. 3΄ biotinylated adapter molecules (red) are attached to the 3΄ ends of the DNA fragments via hybridization to a stretch of six random nucleotides (marked as ‘N’) belonging to a splinter oligonucleotide complementary to the adapter and nick closure with T4 DNA ligase. Following the immobilization of the ligation products on streptavidin-coated beads, the splinter oligonucleotide is removed by bead wash at an elevated temperature. Synthesis of the second strand is carried out using the Klenow fragment of Escherichia coli DNA polymerase I and a primer with phosphorothioate backbone modifications (red stars) to prevent exonucleolytic degradation. Unincorporated primers are removed through a bead wash at an elevated temperature, preventing the formation of adapter dimers in the subsequent blunt-end ligation reaction, which is again catalyzed by T4 DNA ligase. Adapter self-ligation is prevented through a 3΄ dideoxy modification in the adapter. The final library strand is released from the beads by heat denaturation. ( B ) In the single-stranded library preparation method originally described in Gansauge and Meyer, ( 4 ), the first adapter was attached through true single-stranded DNA ligation using CircLigase. The large fragment of Bst DNA polymerase was used to copy the template strand, leaving overhanging 3΄ nucleotides, which had to be removed in a blunt-end repair reaction using T4 DNA polymerase. ( C ) The ‘454’ method of double-stranded library preparation in the implementation of Meyer and Kircher, ( 23 ), is based on non-directional blunt-end ligation of a mixture of two adapters to blunt-end repaired DNA fragments using T4 DNA ligase. To prevent adapter self-ligation, no phosphate groups are present at the 5΄ ends of the adapters, resulting in the ligation of the adapter strands only and necessitating subsequent nick fill-in with a strand-displacing polymerase. Intermittent DNA purification steps are required in-between enzymatic reactions. ( D ) The ‘Illumina’ method of double-stranded library preparation, shown here as implemented in New England Biolabs’ NEBNext Ultra II kit, requires the addition of A-overhangs (marked as ‘A’) to blunt-end repaired DNA fragments using a 3΄-5΄ exonuclease deletion mutant of the Klenow fragment of E. coli DNA polymerase I. Both adapter sequences are combined into one bell-shaped structure, which carries a 3΄ T overhang to allow sticky end ligation with T4 DNA ligase. Following ligation, adapter strands are separated by excision of uracil. Excess adapters and adapter dimers are removed through size-selective purification.
    Figure Legend Snippet: Library preparation methods for highly degraded DNA. ( A ) In the single-stranded library preparation method described here (ssDNA2.0), DNA fragments (black) are 5΄ and 3΄ dephosphorylated and separated into single strands by heat denaturation. 3΄ biotinylated adapter molecules (red) are attached to the 3΄ ends of the DNA fragments via hybridization to a stretch of six random nucleotides (marked as ‘N’) belonging to a splinter oligonucleotide complementary to the adapter and nick closure with T4 DNA ligase. Following the immobilization of the ligation products on streptavidin-coated beads, the splinter oligonucleotide is removed by bead wash at an elevated temperature. Synthesis of the second strand is carried out using the Klenow fragment of Escherichia coli DNA polymerase I and a primer with phosphorothioate backbone modifications (red stars) to prevent exonucleolytic degradation. Unincorporated primers are removed through a bead wash at an elevated temperature, preventing the formation of adapter dimers in the subsequent blunt-end ligation reaction, which is again catalyzed by T4 DNA ligase. Adapter self-ligation is prevented through a 3΄ dideoxy modification in the adapter. The final library strand is released from the beads by heat denaturation. ( B ) In the single-stranded library preparation method originally described in Gansauge and Meyer, ( 4 ), the first adapter was attached through true single-stranded DNA ligation using CircLigase. The large fragment of Bst DNA polymerase was used to copy the template strand, leaving overhanging 3΄ nucleotides, which had to be removed in a blunt-end repair reaction using T4 DNA polymerase. ( C ) The ‘454’ method of double-stranded library preparation in the implementation of Meyer and Kircher, ( 23 ), is based on non-directional blunt-end ligation of a mixture of two adapters to blunt-end repaired DNA fragments using T4 DNA ligase. To prevent adapter self-ligation, no phosphate groups are present at the 5΄ ends of the adapters, resulting in the ligation of the adapter strands only and necessitating subsequent nick fill-in with a strand-displacing polymerase. Intermittent DNA purification steps are required in-between enzymatic reactions. ( D ) The ‘Illumina’ method of double-stranded library preparation, shown here as implemented in New England Biolabs’ NEBNext Ultra II kit, requires the addition of A-overhangs (marked as ‘A’) to blunt-end repaired DNA fragments using a 3΄-5΄ exonuclease deletion mutant of the Klenow fragment of E. coli DNA polymerase I. Both adapter sequences are combined into one bell-shaped structure, which carries a 3΄ T overhang to allow sticky end ligation with T4 DNA ligase. Following ligation, adapter strands are separated by excision of uracil. Excess adapters and adapter dimers are removed through size-selective purification.

    Techniques Used: Hybridization, Ligation, Modification, DNA Ligation, DNA Purification, Mutagenesis, Purification

    Effects of single-stranded ligation schemes on library characteristics. ( A ) Informative sequence content of libraries prepared with CircLigase and T4 DNA ligase as a function of the input volume of ancient DNA extract used for library preparation. ( B ) Average GC content of the sequences obtained with the two ligation schemes. Note that the average GC content exceeds that of a typical mammalian genome because most sequences derive from microbial DNA, which is the dominant source of DNA in most ancient bones. ( C ) Fragment size distribution in the libraries as inferred from overlap-merged paired-end reads. Short artifacts in the library prepared from extremely little input DNA (corresponding to ∼1 mg bone) are mainly due to the incorporation of splinter fragments. ( D ) Frequencies of damage-induced C to T substitutions near the 5΄ and 3΄ ends of sequences.
    Figure Legend Snippet: Effects of single-stranded ligation schemes on library characteristics. ( A ) Informative sequence content of libraries prepared with CircLigase and T4 DNA ligase as a function of the input volume of ancient DNA extract used for library preparation. ( B ) Average GC content of the sequences obtained with the two ligation schemes. Note that the average GC content exceeds that of a typical mammalian genome because most sequences derive from microbial DNA, which is the dominant source of DNA in most ancient bones. ( C ) Fragment size distribution in the libraries as inferred from overlap-merged paired-end reads. Short artifacts in the library prepared from extremely little input DNA (corresponding to ∼1 mg bone) are mainly due to the incorporation of splinter fragments. ( D ) Frequencies of damage-induced C to T substitutions near the 5΄ and 3΄ ends of sequences.

    Techniques Used: Ligation, Sequencing, Ancient DNA Assay

    2) Product Images from "Changes in Locus-specific V(D)J Recombinase Activity Induced by Immunoglobulin Gene Products during B Cell Development"

    Article Title: Changes in Locus-specific V(D)J Recombinase Activity Induced by Immunoglobulin Gene Products during B Cell Development

    Journal: The Journal of Experimental Medicine

    doi:

    ( A ) Diagram of the LMPCR assay used to detect signal end and coding end double stranded DNA breaks at rearranging loci. A rearranging locus is shown, with the RSS abutting the coding portion of a rearranging gene segment (J1, filled area ). Cleavage by V(D)J recombinase at an RSS generates two kinds of ends: a signal end and a coding end. The signal end is blunt and 5′-phosphorylated and available for linker ligation. The coding end is processed through a hairpin intermediate and the asterisk next to it signifies heterogeneity in the fine structure of the opened hairpin. Coding ends are blunted with T4 DNA polymerase and then subjected to linker ligation. Amplification is subsequently carried out using a linker-specific primer ( BW ) and a set of locus-specific primers (1, 2 or 1′, 2′). ( B ) SBE in developing B cells from wild-type and Eμ- myc mice. Purified DNA from sorted subpopulations of B cells from wild-type Balb/c and Eμ- myc mice was subjected to LMPCR to detect SBE upstream of the D FL16.1 , J κ1 , and J κ2 segments. PCR products were analyzed by electrophoresis on agarose gels, blot transfer to a nylon membrane, and hybridization with locus-specific oligonucleotide probes. The identities of the indicated PCR products were confirmed by DNA sequence analysis ( 28 ). Labeled products were visualized with a PhosphorImager. Lanes 1–10 , B cell development stages as defined in Table 1 ; lane 11 , 6312, a pro-B cell line derived from a RAG-2-deficient mouse ( 3 ); lane 12 , B220 + cells from bone marrow, representing all stages of B cell development; lane 13 , same as lane 12 , with no ligase added at the linker ligation step. The bottom strip shows an ethidium bromide-stained agarose gel of a control amplification of a non-rearranging locus ( CD14 ), showing equivalent amounts of amplifiable DNA in all samples.
    Figure Legend Snippet: ( A ) Diagram of the LMPCR assay used to detect signal end and coding end double stranded DNA breaks at rearranging loci. A rearranging locus is shown, with the RSS abutting the coding portion of a rearranging gene segment (J1, filled area ). Cleavage by V(D)J recombinase at an RSS generates two kinds of ends: a signal end and a coding end. The signal end is blunt and 5′-phosphorylated and available for linker ligation. The coding end is processed through a hairpin intermediate and the asterisk next to it signifies heterogeneity in the fine structure of the opened hairpin. Coding ends are blunted with T4 DNA polymerase and then subjected to linker ligation. Amplification is subsequently carried out using a linker-specific primer ( BW ) and a set of locus-specific primers (1, 2 or 1′, 2′). ( B ) SBE in developing B cells from wild-type and Eμ- myc mice. Purified DNA from sorted subpopulations of B cells from wild-type Balb/c and Eμ- myc mice was subjected to LMPCR to detect SBE upstream of the D FL16.1 , J κ1 , and J κ2 segments. PCR products were analyzed by electrophoresis on agarose gels, blot transfer to a nylon membrane, and hybridization with locus-specific oligonucleotide probes. The identities of the indicated PCR products were confirmed by DNA sequence analysis ( 28 ). Labeled products were visualized with a PhosphorImager. Lanes 1–10 , B cell development stages as defined in Table 1 ; lane 11 , 6312, a pro-B cell line derived from a RAG-2-deficient mouse ( 3 ); lane 12 , B220 + cells from bone marrow, representing all stages of B cell development; lane 13 , same as lane 12 , with no ligase added at the linker ligation step. The bottom strip shows an ethidium bromide-stained agarose gel of a control amplification of a non-rearranging locus ( CD14 ), showing equivalent amounts of amplifiable DNA in all samples.

    Techniques Used: Ligation, Amplification, Mouse Assay, Purification, Polymerase Chain Reaction, Electrophoresis, Hybridization, Sequencing, Labeling, Derivative Assay, Stripping Membranes, Staining, Agarose Gel Electrophoresis

    Related Articles

    Concentration Assay:

    Article Title: Distinct Classes of Chromatin Loops Revealed by Deletion of an RNA-Binding Region in CTCF.
    Article Snippet: .. Mammalian genomes are folded into topologically associating domains (TADs), consisting of chromatin loops anchored by CTCF and cohesin. .. Mammalian genomes are folded into topologically associating domains (TADs), consisting of chromatin loops anchored by CTCF and cohesin.

    Incubation:

    Article Title: Distinct Classes of Chromatin Loops Revealed by Deletion of an RNA-Binding Region in CTCF.
    Article Snippet: .. Mammalian genomes are folded into topologically associating domains (TADs), consisting of chromatin loops anchored by CTCF and cohesin. .. Mammalian genomes are folded into topologically associating domains (TADs), consisting of chromatin loops anchored by CTCF and cohesin.

    Article Title: Changes in Locus-specific V(D)J Recombinase Activity Induced by Immunoglobulin Gene Products during B Cell Development
    Article Snippet: .. After the plugs solidified, they were incubated overnight at 55°C (in 100 mM Tris, pH 8.0, 25 mM EDTA, 1% sarkosyl, and 400 μg/ml proteinase K), washed in TE containing 0.5 mM PMSF for 30 min, then washed three more times in TE over 24 h. The plugs were next treated with T4 DNA polymerase by adding in a 40 μl reaction mixture containing polymerase buffer, three units T4 DNA polymerase (Life Technologies), and 100 μM dNTPs, for 1 h at 37°C. .. Plugs were then washed two more times in excess TE over 12 h and used for linker ligation.

    Ligation:

    Article Title: High throughput cloning with restriction enzymes.
    Article Snippet: .. The systematic structural analysis of many target proteins involves generating expression clones in high throughput. .. The systematic structural analysis of many target proteins involves generating expression clones in high throughput.

    Article Title: Efficient cross-species capture hybridization and next-generation sequencing of mitochondrial genomes from noninvasively sampled museum specimens
    Article Snippet: .. DNA extracts were blunt-ended for adapter ligation using a 1 × 20 μL master mix of 9.5 μL of H2 O, 8 μL of 5× reaction buffer for T4 DNA polymerase, 2.5 U of T4 DNA polymerase (Fermentas) in the presence of 0.4 mM dNTPs. .. Twenty microliters of the master mix was added to 20 μL of museum DNA extract and incubated for 10 min at 70°C.

    Plasmid Preparation:

    Article Title: Tenebrio molitor antifreeze protein gene identification and regulation.
    Article Snippet: .. The yellow mealworm, Tenebrio molitor, is a freeze susceptible, stored product pest. .. The yellow mealworm, Tenebrio molitor, is a freeze susceptible, stored product pest.

    Clone Assay:

    Article Title: High throughput cloning with restriction enzymes.
    Article Snippet: .. The systematic structural analysis of many target proteins involves generating expression clones in high throughput. .. The systematic structural analysis of many target proteins involves generating expression clones in high throughput.

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    Thermo Fisher dnase i amplification grade
    Overview of RT-RamDA and single-cell RamDA-seq.  a  Schematic diagram of RT-RamDA. 1. RT primers (oligo-dT and not-so-random primers) anneal to a RNA template. 2. Complementary DNA (cDNA) is synthesized by the RNA-dependent DNA polymerase activity of RNase H minus reverse transcriptase (RTase). 3. Endonuclease (DNase I) selectively nicks the cDNA of the RNA:cDNA hybrid strand. 4. The 3′ cDNA strand is displaced by the strand displacement activity of RTase mediated by the T4 gene 32 protein (gp32), starting from the nick randomly introduced by DNase I. cDNA is amplified as a displaced strand and protected by gp32 from DNase I.  b  Relative yield of cDNA molecules using RT-qPCR ( n  = 4). Mouse ESC total RNA (10 pg) was used as a template, and 1/10 the amount of cDNA was used for qPCR. The relative yield was calculated by averaging the amplification efficiency of four mESC ( Nanog ,  Pou5f1 ,  Zfp42 , and  Sox2 ) and three housekeeping ( Gnb2l1 ,  Atp5a1 , and  Tubb5 ) genes using a conventional method (−) as a standard.  c  Schematic diagram of RamDA-seq and C1-RamDA-seq. For details, please refer to the Methods section.  d  Number of detected transcripts with twofold or lower expression changes against rdRNA-seq (count ≥ 10). For the boxplots in  b  and  d , the center line, and lower and upper bounds of each box represent the median, and first and third quartiles, respectively. The lower (upper) whisker extends to smallest (largest) values no further than 1.5 × interquartile range (IQR) from the first (third) quartile.  e  Squared coefficient of variation of the read count. All conditions were adjusted, and 10 million reads were used in  d  and  e . Transcripts were annotated by GENCODE gene annotation (vM9)
    Dnase I Amplification Grade, supplied by Thermo Fisher, used in various techniques. Bioz Stars score: 99/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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    Thermo Fisher dnase i reaction buffer
    Overview of RT-RamDA and single-cell RamDA-seq.  a  Schematic diagram of RT-RamDA. 1. RT primers (oligo-dT and not-so-random primers) anneal to a RNA template. 2. Complementary DNA (cDNA) is synthesized by the RNA-dependent DNA polymerase activity of RNase H minus reverse transcriptase (RTase). 3. Endonuclease (DNase I) selectively nicks the cDNA of the RNA:cDNA hybrid strand. 4. The 3′ cDNA strand is displaced by the strand displacement activity of RTase mediated by the T4 gene 32 protein (gp32), starting from the nick randomly introduced by DNase I. cDNA is amplified as a displaced strand and protected by gp32 from DNase I.  b  Relative yield of cDNA molecules using RT-qPCR ( n  = 4). Mouse ESC total RNA (10 pg) was used as a template, and 1/10 the amount of cDNA was used for qPCR. The relative yield was calculated by averaging the amplification efficiency of four mESC ( Nanog ,  Pou5f1 ,  Zfp42 , and  Sox2 ) and three housekeeping ( Gnb2l1 ,  Atp5a1 , and  Tubb5 ) genes using a conventional method (−) as a standard.  c  Schematic diagram of RamDA-seq and C1-RamDA-seq. For details, please refer to the Methods section.  d  Number of detected transcripts with twofold or lower expression changes against rdRNA-seq (count ≥ 10). For the boxplots in  b  and  d , the center line, and lower and upper bounds of each box represent the median, and first and third quartiles, respectively. The lower (upper) whisker extends to smallest (largest) values no further than 1.5 × interquartile range (IQR) from the first (third) quartile.  e  Squared coefficient of variation of the read count. All conditions were adjusted, and 10 million reads were used in  d  and  e . Transcripts were annotated by GENCODE gene annotation (vM9)
    Dnase I Reaction Buffer, supplied by Thermo Fisher, used in various techniques. Bioz Stars score: 99/100, based on 25 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/result/dnase i reaction buffer/product/Thermo Fisher
    Average 99 stars, based on 25 article reviews
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    92
    Thermo Fisher t4 dna polymerase
    Single-stranded DNA ligation with <t>T4</t> DNA ligase and CircLigase. A pool of 60 nt acceptor oligonucleotides (‘60N’) were ligated to 10 pmol of a 3΄ biotinylated donor oligonucleotide (CL78) using either T4 DNA ligase in the presence of a splinter oligonucleotide (TL38) or CircLigase. Ligation products were visualized on a 10% denaturing polyacrylamide gel stained with SybrGold. Band shifts from 60 nt to 80 nt indicate successful ligation. Schematic overviews of the reaction schemes are shown on top. The scheme developed by Kwok et al . ( 19 ) is shown for comparison. M: Single-stranded DNA size marker.
    T4 Dna Polymerase, supplied by Thermo Fisher, used in various techniques. Bioz Stars score: 92/100, based on 165 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/result/t4 dna polymerase/product/Thermo Fisher
    Average 92 stars, based on 165 article reviews
    Price from $9.99 to $1999.99
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    Overview of RT-RamDA and single-cell RamDA-seq.  a  Schematic diagram of RT-RamDA. 1. RT primers (oligo-dT and not-so-random primers) anneal to a RNA template. 2. Complementary DNA (cDNA) is synthesized by the RNA-dependent DNA polymerase activity of RNase H minus reverse transcriptase (RTase). 3. Endonuclease (DNase I) selectively nicks the cDNA of the RNA:cDNA hybrid strand. 4. The 3′ cDNA strand is displaced by the strand displacement activity of RTase mediated by the T4 gene 32 protein (gp32), starting from the nick randomly introduced by DNase I. cDNA is amplified as a displaced strand and protected by gp32 from DNase I.  b  Relative yield of cDNA molecules using RT-qPCR ( n  = 4). Mouse ESC total RNA (10 pg) was used as a template, and 1/10 the amount of cDNA was used for qPCR. The relative yield was calculated by averaging the amplification efficiency of four mESC ( Nanog ,  Pou5f1 ,  Zfp42 , and  Sox2 ) and three housekeeping ( Gnb2l1 ,  Atp5a1 , and  Tubb5 ) genes using a conventional method (−) as a standard.  c  Schematic diagram of RamDA-seq and C1-RamDA-seq. For details, please refer to the Methods section.  d  Number of detected transcripts with twofold or lower expression changes against rdRNA-seq (count ≥ 10). For the boxplots in  b  and  d , the center line, and lower and upper bounds of each box represent the median, and first and third quartiles, respectively. The lower (upper) whisker extends to smallest (largest) values no further than 1.5 × interquartile range (IQR) from the first (third) quartile.  e  Squared coefficient of variation of the read count. All conditions were adjusted, and 10 million reads were used in  d  and  e . Transcripts were annotated by GENCODE gene annotation (vM9)

    Journal: Nature Communications

    Article Title: Single-cell full-length total RNA sequencing uncovers dynamics of recursive splicing and enhancer RNAs

    doi: 10.1038/s41467-018-02866-0

    Figure Lengend Snippet: Overview of RT-RamDA and single-cell RamDA-seq. a Schematic diagram of RT-RamDA. 1. RT primers (oligo-dT and not-so-random primers) anneal to a RNA template. 2. Complementary DNA (cDNA) is synthesized by the RNA-dependent DNA polymerase activity of RNase H minus reverse transcriptase (RTase). 3. Endonuclease (DNase I) selectively nicks the cDNA of the RNA:cDNA hybrid strand. 4. The 3′ cDNA strand is displaced by the strand displacement activity of RTase mediated by the T4 gene 32 protein (gp32), starting from the nick randomly introduced by DNase I. cDNA is amplified as a displaced strand and protected by gp32 from DNase I. b Relative yield of cDNA molecules using RT-qPCR ( n  = 4). Mouse ESC total RNA (10 pg) was used as a template, and 1/10 the amount of cDNA was used for qPCR. The relative yield was calculated by averaging the amplification efficiency of four mESC ( Nanog , Pou5f1 , Zfp42 , and Sox2 ) and three housekeeping ( Gnb2l1 , Atp5a1 , and Tubb5 ) genes using a conventional method (−) as a standard. c Schematic diagram of RamDA-seq and C1-RamDA-seq. For details, please refer to the Methods section. d Number of detected transcripts with twofold or lower expression changes against rdRNA-seq (count ≥ 10). For the boxplots in b and d , the center line, and lower and upper bounds of each box represent the median, and first and third quartiles, respectively. The lower (upper) whisker extends to smallest (largest) values no further than 1.5 × interquartile range (IQR) from the first (third) quartile. e Squared coefficient of variation of the read count. All conditions were adjusted, and 10 million reads were used in d and e . Transcripts were annotated by GENCODE gene annotation (vM9)

    Article Snippet: A mixture containing 2 μL of conventional RT mix (1.5× PrimeScript buffer, 0.6 pmol oligo(dT)18 (Thermo Fisher), 8 pmol random hexamers (TaKaRa), and 1.5× PrimeScript enzyme mix in RNase-free water) or 2 μL of RT-RamDA mix (1.5× PrimeScript buffer, 0.6 pmol oligo(dT)18, 8 pmol random hexamers or NSRs, 0.2 U of DNase I Amplification Grade (Thermo Fisher), 100 ng of T4 gene 32 protein (Roche), and 1.5× PrimeScript enzyme mix in RNase-free water) was added to 1 μL of diluted, denatured template RNA.

    Techniques: Synthesized, Activity Assay, Amplification, Quantitative RT-PCR, Real-time Polymerase Chain Reaction, Expressing, Whisker Assay

    Overview of RT-RamDA and single-cell RamDA-seq.  a  Schematic diagram of RT-RamDA. 1. RT primers (oligo-dT and not-so-random primers) anneal to a RNA template. 2. Complementary DNA (cDNA) is synthesized by the RNA-dependent DNA polymerase activity of RNase H minus reverse transcriptase (RTase). 3. Endonuclease (DNase I) selectively nicks the cDNA of the RNA:cDNA hybrid strand. 4. The 3′ cDNA strand is displaced by the strand displacement activity of RTase mediated by the T4 gene 32 protein (gp32), starting from the nick randomly introduced by DNase I. cDNA is amplified as a displaced strand and protected by gp32 from DNase I.  b  Relative yield of cDNA molecules using RT-qPCR ( n  = 4). Mouse ESC total RNA (10 pg) was used as a template, and 1/10 the amount of cDNA was used for qPCR. The relative yield was calculated by averaging the amplification efficiency of four mESC ( Nanog ,  Pou5f1 ,  Zfp42 , and  Sox2 ) and three housekeeping ( Gnb2l1 ,  Atp5a1 , and  Tubb5 ) genes using a conventional method (−) as a standard.  c  Schematic diagram of RamDA-seq and C1-RamDA-seq. For details, please refer to the Methods section.  d  Number of detected transcripts with twofold or lower expression changes against rdRNA-seq (count ≥ 10). For the boxplots in  b  and  d , the center line, and lower and upper bounds of each box represent the median, and first and third quartiles, respectively. The lower (upper) whisker extends to smallest (largest) values no further than 1.5 × interquartile range (IQR) from the first (third) quartile.  e  Squared coefficient of variation of the read count. All conditions were adjusted, and 10 million reads were used in  d  and  e . Transcripts were annotated by GENCODE gene annotation (vM9)

    Journal: Nature Communications

    Article Title: Single-cell full-length total RNA sequencing uncovers dynamics of recursive splicing and enhancer RNAs

    doi: 10.1038/s41467-018-02866-0

    Figure Lengend Snippet: Overview of RT-RamDA and single-cell RamDA-seq. a Schematic diagram of RT-RamDA. 1. RT primers (oligo-dT and not-so-random primers) anneal to a RNA template. 2. Complementary DNA (cDNA) is synthesized by the RNA-dependent DNA polymerase activity of RNase H minus reverse transcriptase (RTase). 3. Endonuclease (DNase I) selectively nicks the cDNA of the RNA:cDNA hybrid strand. 4. The 3′ cDNA strand is displaced by the strand displacement activity of RTase mediated by the T4 gene 32 protein (gp32), starting from the nick randomly introduced by DNase I. cDNA is amplified as a displaced strand and protected by gp32 from DNase I. b Relative yield of cDNA molecules using RT-qPCR ( n  = 4). Mouse ESC total RNA (10 pg) was used as a template, and 1/10 the amount of cDNA was used for qPCR. The relative yield was calculated by averaging the amplification efficiency of four mESC ( Nanog , Pou5f1 , Zfp42 , and Sox2 ) and three housekeeping ( Gnb2l1 , Atp5a1 , and Tubb5 ) genes using a conventional method (−) as a standard. c Schematic diagram of RamDA-seq and C1-RamDA-seq. For details, please refer to the Methods section. d Number of detected transcripts with twofold or lower expression changes against rdRNA-seq (count ≥ 10). For the boxplots in b and d , the center line, and lower and upper bounds of each box represent the median, and first and third quartiles, respectively. The lower (upper) whisker extends to smallest (largest) values no further than 1.5 × interquartile range (IQR) from the first (third) quartile. e Squared coefficient of variation of the read count. All conditions were adjusted, and 10 million reads were used in d and e . Transcripts were annotated by GENCODE gene annotation (vM9)

    Article Snippet: Next, 0.5 μL of genomic DNA digestion mix (0.1 U of DNase I Amplification Grade (Thermo Fisher) and 2× DNase I Reaction Buffer (Thermo Fisher) in RNase-free water) was added to 1 μL of the single-cell lysate in a 96-well PCR plate and incubated at 25 °C for 5 min. After genomic DNA digestion, we added 0.5 µL of denaturing mix (8 mM EDTA and 0.02% NP40 in RNase-free water) to the digested sample, followed by incubation at 70 °C for 5 min to inactivate DNase I and desaturate the RNAs.

    Techniques: Synthesized, Activity Assay, Amplification, Quantitative RT-PCR, Real-time Polymerase Chain Reaction, Expressing, Whisker Assay

    Single-stranded DNA ligation with T4 DNA ligase and CircLigase. A pool of 60 nt acceptor oligonucleotides (‘60N’) were ligated to 10 pmol of a 3΄ biotinylated donor oligonucleotide (CL78) using either T4 DNA ligase in the presence of a splinter oligonucleotide (TL38) or CircLigase. Ligation products were visualized on a 10% denaturing polyacrylamide gel stained with SybrGold. Band shifts from 60 nt to 80 nt indicate successful ligation. Schematic overviews of the reaction schemes are shown on top. The scheme developed by Kwok et al . ( 19 ) is shown for comparison. M: Single-stranded DNA size marker.

    Journal: Nucleic Acids Research

    Article Title: Single-stranded DNA library preparation from highly degraded DNA using T4 DNA ligase

    doi: 10.1093/nar/gkx033

    Figure Lengend Snippet: Single-stranded DNA ligation with T4 DNA ligase and CircLigase. A pool of 60 nt acceptor oligonucleotides (‘60N’) were ligated to 10 pmol of a 3΄ biotinylated donor oligonucleotide (CL78) using either T4 DNA ligase in the presence of a splinter oligonucleotide (TL38) or CircLigase. Ligation products were visualized on a 10% denaturing polyacrylamide gel stained with SybrGold. Band shifts from 60 nt to 80 nt indicate successful ligation. Schematic overviews of the reaction schemes are shown on top. The scheme developed by Kwok et al . ( 19 ) is shown for comparison. M: Single-stranded DNA size marker.

    Article Snippet: For fill-in with T4 DNA polymerase a 50 μl reaction mix was prepared containing 1× T4 DNA polymerase buffer (ThermoFisher Scientific), 0.05% Tween-20, 100 μM each dNTP, 100 pmol primer CL130 and 2 μl 5 U/μl T4 DNA polymerase (ThermoFisher Scientific).

    Techniques: DNA Ligation, Ligation, Staining, Marker

    Library preparation methods for highly degraded DNA. ( A ) In the single-stranded library preparation method described here (ssDNA2.0), DNA fragments (black) are 5΄ and 3΄ dephosphorylated and separated into single strands by heat denaturation. 3΄ biotinylated adapter molecules (red) are attached to the 3΄ ends of the DNA fragments via hybridization to a stretch of six random nucleotides (marked as ‘N’) belonging to a splinter oligonucleotide complementary to the adapter and nick closure with T4 DNA ligase. Following the immobilization of the ligation products on streptavidin-coated beads, the splinter oligonucleotide is removed by bead wash at an elevated temperature. Synthesis of the second strand is carried out using the Klenow fragment of Escherichia coli DNA polymerase I and a primer with phosphorothioate backbone modifications (red stars) to prevent exonucleolytic degradation. Unincorporated primers are removed through a bead wash at an elevated temperature, preventing the formation of adapter dimers in the subsequent blunt-end ligation reaction, which is again catalyzed by T4 DNA ligase. Adapter self-ligation is prevented through a 3΄ dideoxy modification in the adapter. The final library strand is released from the beads by heat denaturation. ( B ) In the single-stranded library preparation method originally described in Gansauge and Meyer, ( 4 ), the first adapter was attached through true single-stranded DNA ligation using CircLigase. The large fragment of Bst DNA polymerase was used to copy the template strand, leaving overhanging 3΄ nucleotides, which had to be removed in a blunt-end repair reaction using T4 DNA polymerase. ( C ) The ‘454’ method of double-stranded library preparation in the implementation of Meyer and Kircher, ( 23 ), is based on non-directional blunt-end ligation of a mixture of two adapters to blunt-end repaired DNA fragments using T4 DNA ligase. To prevent adapter self-ligation, no phosphate groups are present at the 5΄ ends of the adapters, resulting in the ligation of the adapter strands only and necessitating subsequent nick fill-in with a strand-displacing polymerase. Intermittent DNA purification steps are required in-between enzymatic reactions. ( D ) The ‘Illumina’ method of double-stranded library preparation, shown here as implemented in New England Biolabs’ NEBNext Ultra II kit, requires the addition of A-overhangs (marked as ‘A’) to blunt-end repaired DNA fragments using a 3΄-5΄ exonuclease deletion mutant of the Klenow fragment of E. coli DNA polymerase I. Both adapter sequences are combined into one bell-shaped structure, which carries a 3΄ T overhang to allow sticky end ligation with T4 DNA ligase. Following ligation, adapter strands are separated by excision of uracil. Excess adapters and adapter dimers are removed through size-selective purification.

    Journal: Nucleic Acids Research

    Article Title: Single-stranded DNA library preparation from highly degraded DNA using T4 DNA ligase

    doi: 10.1093/nar/gkx033

    Figure Lengend Snippet: Library preparation methods for highly degraded DNA. ( A ) In the single-stranded library preparation method described here (ssDNA2.0), DNA fragments (black) are 5΄ and 3΄ dephosphorylated and separated into single strands by heat denaturation. 3΄ biotinylated adapter molecules (red) are attached to the 3΄ ends of the DNA fragments via hybridization to a stretch of six random nucleotides (marked as ‘N’) belonging to a splinter oligonucleotide complementary to the adapter and nick closure with T4 DNA ligase. Following the immobilization of the ligation products on streptavidin-coated beads, the splinter oligonucleotide is removed by bead wash at an elevated temperature. Synthesis of the second strand is carried out using the Klenow fragment of Escherichia coli DNA polymerase I and a primer with phosphorothioate backbone modifications (red stars) to prevent exonucleolytic degradation. Unincorporated primers are removed through a bead wash at an elevated temperature, preventing the formation of adapter dimers in the subsequent blunt-end ligation reaction, which is again catalyzed by T4 DNA ligase. Adapter self-ligation is prevented through a 3΄ dideoxy modification in the adapter. The final library strand is released from the beads by heat denaturation. ( B ) In the single-stranded library preparation method originally described in Gansauge and Meyer, ( 4 ), the first adapter was attached through true single-stranded DNA ligation using CircLigase. The large fragment of Bst DNA polymerase was used to copy the template strand, leaving overhanging 3΄ nucleotides, which had to be removed in a blunt-end repair reaction using T4 DNA polymerase. ( C ) The ‘454’ method of double-stranded library preparation in the implementation of Meyer and Kircher, ( 23 ), is based on non-directional blunt-end ligation of a mixture of two adapters to blunt-end repaired DNA fragments using T4 DNA ligase. To prevent adapter self-ligation, no phosphate groups are present at the 5΄ ends of the adapters, resulting in the ligation of the adapter strands only and necessitating subsequent nick fill-in with a strand-displacing polymerase. Intermittent DNA purification steps are required in-between enzymatic reactions. ( D ) The ‘Illumina’ method of double-stranded library preparation, shown here as implemented in New England Biolabs’ NEBNext Ultra II kit, requires the addition of A-overhangs (marked as ‘A’) to blunt-end repaired DNA fragments using a 3΄-5΄ exonuclease deletion mutant of the Klenow fragment of E. coli DNA polymerase I. Both adapter sequences are combined into one bell-shaped structure, which carries a 3΄ T overhang to allow sticky end ligation with T4 DNA ligase. Following ligation, adapter strands are separated by excision of uracil. Excess adapters and adapter dimers are removed through size-selective purification.

    Article Snippet: For fill-in with T4 DNA polymerase a 50 μl reaction mix was prepared containing 1× T4 DNA polymerase buffer (ThermoFisher Scientific), 0.05% Tween-20, 100 μM each dNTP, 100 pmol primer CL130 and 2 μl 5 U/μl T4 DNA polymerase (ThermoFisher Scientific).

    Techniques: Hybridization, Ligation, Modification, DNA Ligation, DNA Purification, Mutagenesis, Purification

    Effects of single-stranded ligation schemes on library characteristics. ( A ) Informative sequence content of libraries prepared with CircLigase and T4 DNA ligase as a function of the input volume of ancient DNA extract used for library preparation. ( B ) Average GC content of the sequences obtained with the two ligation schemes. Note that the average GC content exceeds that of a typical mammalian genome because most sequences derive from microbial DNA, which is the dominant source of DNA in most ancient bones. ( C ) Fragment size distribution in the libraries as inferred from overlap-merged paired-end reads. Short artifacts in the library prepared from extremely little input DNA (corresponding to ∼1 mg bone) are mainly due to the incorporation of splinter fragments. ( D ) Frequencies of damage-induced C to T substitutions near the 5΄ and 3΄ ends of sequences.

    Journal: Nucleic Acids Research

    Article Title: Single-stranded DNA library preparation from highly degraded DNA using T4 DNA ligase

    doi: 10.1093/nar/gkx033

    Figure Lengend Snippet: Effects of single-stranded ligation schemes on library characteristics. ( A ) Informative sequence content of libraries prepared with CircLigase and T4 DNA ligase as a function of the input volume of ancient DNA extract used for library preparation. ( B ) Average GC content of the sequences obtained with the two ligation schemes. Note that the average GC content exceeds that of a typical mammalian genome because most sequences derive from microbial DNA, which is the dominant source of DNA in most ancient bones. ( C ) Fragment size distribution in the libraries as inferred from overlap-merged paired-end reads. Short artifacts in the library prepared from extremely little input DNA (corresponding to ∼1 mg bone) are mainly due to the incorporation of splinter fragments. ( D ) Frequencies of damage-induced C to T substitutions near the 5΄ and 3΄ ends of sequences.

    Article Snippet: For fill-in with T4 DNA polymerase a 50 μl reaction mix was prepared containing 1× T4 DNA polymerase buffer (ThermoFisher Scientific), 0.05% Tween-20, 100 μM each dNTP, 100 pmol primer CL130 and 2 μl 5 U/μl T4 DNA polymerase (ThermoFisher Scientific).

    Techniques: Ligation, Sequencing, Ancient DNA Assay