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HNF1 transcription factor motifs contribute to enhancer activity near selected T2D-associated variants (A) For 47 HNF1-motif-overlapping fragments with significant INS promoter-bias effects on activity, we designed three versions: original (motif intact), deleted (motif removed and sequence adjusted), and shuffled (dinucleotide-shuffled motif). When the tested variant was adjacent to the motif, we synthesized both reference and alternative alleles for each version. For variants directly overlapping the motif, we generated only one deletion and one shuffled fragment. (B) We synthesized four fragments corresponding to the variant rs1635852, which overlaps an HNF1 motif at a high-information-content position. The T2D risk allele (T) disrupts this motif, while the non-risk allele (C) matches the consensus. (C) Shuffling the motif significantly decreased enhancer activity compared to intact fragments with either the risk T (Wilcoxon rank-sum test p = 0.016) or non-risk C ( p = 0.008) allele. Motif deletion also significantly decreased enhancer activity compared to the non-risk C allele ( p = 0.016). (D) For the variant rs11819995, located 11 bp upstream of an HNF1 motif, we synthesized six fragments. (E) Deletion of the motif significantly decreased enhancer activity for both the reference (C, non-risk) and alternative (T, risk) alleles ( p = 0.008 for both alleles). Shuffling the motif likewise reduced activity for both alleles ( p = 0.008 for the reference allele and p = 0.056 for the alternative allele). (F) To assess context-specific effects, we cloned these fragments into MPRA vectors with the SCP1 or skeletal-muscle-specific MYBPC2 promoter and delivered all three <t>to</t> <t>LHCN-M2</t> human skeletal muscle myotubes ( n = 6). (G) When paired with the INS promoter, the shuffled rs11819995-containing fragment showed increased activity relative to the original fragment ( p = 0.015); however, none of the fragments containing rs11819995 functioned as enhancers in LHCN-M2 myotubes, regardless of promoter context. Overall, their activity is highest when paired with the skeletal-muscle-specific promoter.
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HNF1 transcription factor motifs contribute to enhancer activity near selected T2D-associated variants (A) For 47 HNF1-motif-overlapping fragments with significant INS promoter-bias effects on activity, we designed three versions: original (motif intact), deleted (motif removed and sequence adjusted), and shuffled (dinucleotide-shuffled motif). When the tested variant was adjacent to the motif, we synthesized both reference and alternative alleles for each version. For variants directly overlapping the motif, we generated only one deletion and one shuffled fragment. (B) We synthesized four fragments corresponding to the variant rs1635852, which overlaps an HNF1 motif at a high-information-content position. The T2D risk allele (T) disrupts this motif, while the non-risk allele (C) matches the consensus. (C) Shuffling the motif significantly decreased enhancer activity compared to intact fragments with either the risk T (Wilcoxon rank-sum test p = 0.016) or non-risk C ( p = 0.008) allele. Motif deletion also significantly decreased enhancer activity compared to the non-risk C allele ( p = 0.016). (D) For the variant rs11819995, located 11 bp upstream of an HNF1 motif, we synthesized six fragments. (E) Deletion of the motif significantly decreased enhancer activity for both the reference (C, non-risk) and alternative (T, risk) alleles ( p = 0.008 for both alleles). Shuffling the motif likewise reduced activity for both alleles ( p = 0.008 for the reference allele and p = 0.056 for the alternative allele). (F) To assess context-specific effects, we cloned these fragments into MPRA vectors with the SCP1 or skeletal-muscle-specific MYBPC2 promoter and delivered all three <t>to</t> <t>LHCN-M2</t> human skeletal muscle myotubes ( n = 6). (G) When paired with the INS promoter, the shuffled rs11819995-containing fragment showed increased activity relative to the original fragment ( p = 0.015); however, none of the fragments containing rs11819995 functioned as enhancers in LHCN-M2 myotubes, regardless of promoter context. Overall, their activity is highest when paired with the skeletal-muscle-specific promoter.
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HNF1 transcription factor motifs contribute to enhancer activity near selected T2D-associated variants (A) For 47 HNF1-motif-overlapping fragments with significant INS promoter-bias effects on activity, we designed three versions: original (motif intact), deleted (motif removed and sequence adjusted), and shuffled (dinucleotide-shuffled motif). When the tested variant was adjacent to the motif, we synthesized both reference and alternative alleles for each version. For variants directly overlapping the motif, we generated only one deletion and one shuffled fragment. (B) We synthesized four fragments corresponding to the variant rs1635852, which overlaps an HNF1 motif at a high-information-content position. The T2D risk allele (T) disrupts this motif, while the non-risk allele (C) matches the consensus. (C) Shuffling the motif significantly decreased enhancer activity compared to intact fragments with either the risk T (Wilcoxon rank-sum test p = 0.016) or non-risk C ( p = 0.008) allele. Motif deletion also significantly decreased enhancer activity compared to the non-risk C allele ( p = 0.016). (D) For the variant rs11819995, located 11 bp upstream of an HNF1 motif, we synthesized six fragments. (E) Deletion of the motif significantly decreased enhancer activity for both the reference (C, non-risk) and alternative (T, risk) alleles ( p = 0.008 for both alleles). Shuffling the motif likewise reduced activity for both alleles ( p = 0.008 for the reference allele and p = 0.056 for the alternative allele). (F) To assess context-specific effects, we cloned these fragments into MPRA vectors with the SCP1 or skeletal-muscle-specific MYBPC2 promoter and delivered all three <t>to</t> <t>LHCN-M2</t> human skeletal muscle myotubes ( n = 6). (G) When paired with the INS promoter, the shuffled rs11819995-containing fragment showed increased activity relative to the original fragment ( p = 0.015); however, none of the fragments containing rs11819995 functioned as enhancers in LHCN-M2 myotubes, regardless of promoter context. Overall, their activity is highest when paired with the skeletal-muscle-specific promoter.
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primary human skeletal myoblasts  (Thermo Fisher)
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HNF1 transcription factor motifs contribute to enhancer activity near selected T2D-associated variants (A) For 47 HNF1-motif-overlapping fragments with significant INS promoter-bias effects on activity, we designed three versions: original (motif intact), deleted (motif removed and sequence adjusted), and shuffled (dinucleotide-shuffled motif). When the tested variant was adjacent to the motif, we synthesized both reference and alternative alleles for each version. For variants directly overlapping the motif, we generated only one deletion and one shuffled fragment. (B) We synthesized four fragments corresponding to the variant rs1635852, which overlaps an HNF1 motif at a high-information-content position. The T2D risk allele (T) disrupts this motif, while the non-risk allele (C) matches the consensus. (C) Shuffling the motif significantly decreased enhancer activity compared to intact fragments with either the risk T (Wilcoxon rank-sum test p = 0.016) or non-risk C ( p = 0.008) allele. Motif deletion also significantly decreased enhancer activity compared to the non-risk C allele ( p = 0.016). (D) For the variant rs11819995, located 11 bp upstream of an HNF1 motif, we synthesized six fragments. (E) Deletion of the motif significantly decreased enhancer activity for both the reference (C, non-risk) and alternative (T, risk) alleles ( p = 0.008 for both alleles). Shuffling the motif likewise reduced activity for both alleles ( p = 0.008 for the reference allele and p = 0.056 for the alternative allele). (F) To assess context-specific effects, we cloned these fragments into MPRA vectors with the SCP1 or skeletal-muscle-specific MYBPC2 promoter and delivered all three <t>to</t> <t>LHCN-M2</t> human skeletal muscle myotubes ( n = 6). (G) When paired with the INS promoter, the shuffled rs11819995-containing fragment showed increased activity relative to the original fragment ( p = 0.015); however, none of the fragments containing rs11819995 functioned as enhancers in LHCN-M2 myotubes, regardless of promoter context. Overall, their activity is highest when paired with the skeletal-muscle-specific promoter.
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HNF1 transcription factor motifs contribute to enhancer activity near selected T2D-associated variants (A) For 47 HNF1-motif-overlapping fragments with significant INS promoter-bias effects on activity, we designed three versions: original (motif intact), deleted (motif removed and sequence adjusted), and shuffled (dinucleotide-shuffled motif). When the tested variant was adjacent to the motif, we synthesized both reference and alternative alleles for each version. For variants directly overlapping the motif, we generated only one deletion and one shuffled fragment. (B) We synthesized four fragments corresponding to the variant rs1635852, which overlaps an HNF1 motif at a high-information-content position. The T2D risk allele (T) disrupts this motif, while the non-risk allele (C) matches the consensus. (C) Shuffling the motif significantly decreased enhancer activity compared to intact fragments with either the risk T (Wilcoxon rank-sum test p = 0.016) or non-risk C ( p = 0.008) allele. Motif deletion also significantly decreased enhancer activity compared to the non-risk C allele ( p = 0.016). (D) For the variant rs11819995, located 11 bp upstream of an HNF1 motif, we synthesized six fragments. (E) Deletion of the motif significantly decreased enhancer activity for both the reference (C, non-risk) and alternative (T, risk) alleles ( p = 0.008 for both alleles). Shuffling the motif likewise reduced activity for both alleles ( p = 0.008 for the reference allele and p = 0.056 for the alternative allele). (F) To assess context-specific effects, we cloned these fragments into MPRA vectors with the SCP1 or skeletal-muscle-specific MYBPC2 promoter and delivered all three to LHCN-M2 human skeletal muscle myotubes ( n = 6). (G) When paired with the INS promoter, the shuffled rs11819995-containing fragment showed increased activity relative to the original fragment ( p = 0.015); however, none of the fragments containing rs11819995 functioned as enhancers in LHCN-M2 myotubes, regardless of promoter context. Overall, their activity is highest when paired with the skeletal-muscle-specific promoter.

Journal: Human Genetics and Genomics Advances

Article Title: Using a modular massively parallel reporter assay to discover context-dependent regulatory activity in type 2 diabetes-linked noncoding regions

doi: 10.1016/j.xhgg.2026.100606

Figure Lengend Snippet: HNF1 transcription factor motifs contribute to enhancer activity near selected T2D-associated variants (A) For 47 HNF1-motif-overlapping fragments with significant INS promoter-bias effects on activity, we designed three versions: original (motif intact), deleted (motif removed and sequence adjusted), and shuffled (dinucleotide-shuffled motif). When the tested variant was adjacent to the motif, we synthesized both reference and alternative alleles for each version. For variants directly overlapping the motif, we generated only one deletion and one shuffled fragment. (B) We synthesized four fragments corresponding to the variant rs1635852, which overlaps an HNF1 motif at a high-information-content position. The T2D risk allele (T) disrupts this motif, while the non-risk allele (C) matches the consensus. (C) Shuffling the motif significantly decreased enhancer activity compared to intact fragments with either the risk T (Wilcoxon rank-sum test p = 0.016) or non-risk C ( p = 0.008) allele. Motif deletion also significantly decreased enhancer activity compared to the non-risk C allele ( p = 0.016). (D) For the variant rs11819995, located 11 bp upstream of an HNF1 motif, we synthesized six fragments. (E) Deletion of the motif significantly decreased enhancer activity for both the reference (C, non-risk) and alternative (T, risk) alleles ( p = 0.008 for both alleles). Shuffling the motif likewise reduced activity for both alleles ( p = 0.008 for the reference allele and p = 0.056 for the alternative allele). (F) To assess context-specific effects, we cloned these fragments into MPRA vectors with the SCP1 or skeletal-muscle-specific MYBPC2 promoter and delivered all three to LHCN-M2 human skeletal muscle myotubes ( n = 6). (G) When paired with the INS promoter, the shuffled rs11819995-containing fragment showed increased activity relative to the original fragment ( p = 0.015); however, none of the fragments containing rs11819995 functioned as enhancers in LHCN-M2 myotubes, regardless of promoter context. Overall, their activity is highest when paired with the skeletal-muscle-specific promoter.

Article Snippet: We obtained INS-1 832/13 rat insulinoma cells from Dr. Christopher Newgard (Sarah W. Stedman Nutrition and Metabolism Center, Duke University, Durham, NC) and LHCN-M2 human skeletal muscle myoblasts from Evercyte.

Techniques: Activity Assay, Sequencing, Variant Assay, Synthesized, Generated, Clone Assay