Transcriptional regulation of pig lactase-phlorizin hydrolase: involvement of HNF-1 and FREACs
Summary
This summary is machine-generated.Researchers identified three new regulatory regions and transcription factors, including hepatocyte nuclear factor (HNF)-1 and HNF-3-like factors, controlling lactase-phlorizin hydrolase gene expression in the intestine.
Area Of Science
- Molecular Biology
- Genetics
- Biochemistry
Background
- The upstream regulatory region of the lactase-phlorizin hydrolase (LPH) gene controls its expression in the small intestine.
- Understanding LPH gene regulation is crucial for addressing lactose intolerance and related digestive disorders.
Purpose Of The Study
- To identify specific DNA elements and transcription factors governing LPH gene expression.
- To elucidate the molecular mechanisms behind tissue-specific and age-dependent regulation of LPH.
Main Methods
- Promoter activity was assessed using transfection assays in Caco-2 cells.
- Electrophoretic mobility shift assays (EMSA) and supershift analyses were employed to identify transcription factor binding.
Main Results
- Three novel regulatory regions within the LPH promoter were identified.
- A putative enhancer region (-894 to -798) binds hepatocyte nuclear factor (HNF)-1.
- A repressor-binding element (-278 to -264) interacts with an HNF-3-like factor, and another element (-178 to -164) binds an activating transcription factor.
Conclusions
- The study identified key regulatory elements and transcription factors (HNF-1, HNF-3-like) involved in LPH gene regulation.
- These findings enhance the understanding of the molecular basis for LPH's tissue-specific, age-dependent, and regional expression patterns in the intestine.
View abstract on PubMed