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Updated: Jun 21, 2026
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Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
Published on: October 9, 2014
Tissue-specific alternative splicing of TCF7L2.
Ludmila Prokunina-Olsson1, Cullan Welch, Ola Hansson
1Genome Technology Branch, National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA. prokuninal@mail.nih.gov
Human Molecular Genetics
|July 16, 2009
Summary
Genetic variants in the TCF7L2 gene strongly influence type 2 diabetes (T2D) risk. This study investigated TCF7L2 gene splicing patterns in various human tissues, revealing tissue-specific alternative splicing. Further research into TCF7L2 splicing in pancreatic islets is recommended for understanding T2D mechanisms.
Area of Science:
- Genetics
- Molecular Biology
- Endocrinology
Background:
- Transcription factor 7-like 2 (TCF7L2) gene variants are key genetic risk factors for type 2 diabetes (T2D).
- The precise mechanisms linking non-coding TCF7L2 variants to T2D pathogenesis remain unclear.
- Understanding TCF7L2 gene regulation is crucial for elucidating T2D development.
Purpose of the Study:
- To investigate the tissue-specific alternative splicing patterns of the TCF7L2 gene.
- To determine the association between TCF7L2 splicing forms and T2D-associated single nucleotide polymorphisms (SNPs).
- To explore the relationship between TCF7L2 splicing in pancreatic islets and proinsulin expression.
Main Methods:
- Utilized 13 expression assays to quantify multiple TCF7L2 mRNA splicing forms.
- Analyzed samples from eight human tissues: pancreas, pancreatic islets, colon, liver, monocytes, skeletal muscle, subcutaneous adipose tissue, and lymphoblastoid cell lines.
- Correlated TCF7L2 splicing patterns with T2D-associated SNPs (rs7903146 and rs12255372) and proinsulin expression in glucose-stimulated pancreatic islets.
Main Results:
- Observed distinct tissue-specific alternative splicing patterns for TCF7L2 across the studied human tissues.
- Identified reduced expression of two TCF7L2 splicing forms in pancreatic islets associated with T2D-risk alleles of the studied SNPs.
- Found a significant correlation between the expression of a specific TCF7L2 splicing form in pancreatic islets and proinsulin expression.
Conclusions:
- TCF7L2 exhibits tissue-specific alternative splicing, with notable patterns in pancreatic islets, pancreas, and colon.
- While initial associations were observed, no statistically significant link between TCF7L2 expression and T2D-associated SNPs remained after multiple testing adjustments.
- Alternative splicing of TCF7L2 in pancreatic islets presents a promising avenue for future research into type 2 diabetes mechanisms.
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