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Functional promoter polymorphism in SREBP cleavage-activating protein (SCAP)
Henian Cao1, Brooke A Miskie, Robert A Hegele
1Blackburn Cardiovascular Genetics Laboratory, Robarts Research Institute 406-100 Perth Drive, London, ON, N6A 5K8, Canada.
Journal of Human Genetics
|August 31, 2002
Summary
A novel mutation in the sterol regulatory element binding protein cleavage-activating protein (SCAP) gene promoter was identified. This loss-of-function mutation significantly reduced gene activity, potentially impacting lipid metabolism.
Area of Science:
- Genetics
- Molecular Biology
- Metabolic Disorders
Background:
- Sterol regulatory element binding protein cleavage-activating protein (SCAP) plays a crucial role in cholesterol homeostasis.
- Dysregulation of SCAP is implicated in metabolic diseases like hyperlipidemia.
Purpose of the Study:
- To identify genetic variations in the SCAP gene promoter associated with combined hyperlipidemia.
- To characterize the functional impact of identified SCAP promoter mutations on gene activity.
Main Methods:
- Direct sequencing of the SCAP gene promoter and coding regions in hyperlipidemia patients.
- Luciferase-based reporter assay to assess promoter activity of identified mutations.
Main Results:
- A loss-of-function -11C>T promoter mutation (resulting in the -11T allele) in the SCAP gene was identified.
- The -11T allele demonstrated a significant reduction in SCAP promoter activity.
- Additional common single-nucleotide polymorphisms in the SCAP promoter and coding sequence were found.
Conclusions:
- The identified -11C>T SCAP promoter mutation is a functional variant potentially contributing to metabolic phenotypes.
- These SCAP genetic markers may serve as valuable tools for association studies in metabolic disorders.