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Quantitative Measurement of GLUT4 Translocation to the Plasma Membrane by Flow Cytometry
Published on: November 7, 2010
Human GLUT4/muscle-fat glucose-transporter gene. Characterization and genetic variation
Diabetes
|November 1, 1992
Summary
Researchers analyzed the human GLUT4 gene and its promoter region, finding no direct association between identified genetic variations and non-insulin-dependent diabetes mellitus (NIDDM). This study investigated GLUT4 gene sequence and promoter activity in relation to diabetes.
Area of Science:
- Molecular Biology
- Genetics
- Endocrinology
Background:
- The GLUT4 facilitative glucose transporter is crucial for glucose uptake in muscle and adipose tissue.
- Insulin resistance, often linked to non-insulin-dependent diabetes mellitus (NIDDM), involves impaired GLUT4 function.
- Understanding GLUT4 gene regulation and variation is key to understanding its role in diabetes.
Purpose of the Study:
- To isolate, characterize, and sequence the human GLUT4 gene and its promoter region.
- To investigate the transcriptional activity of the GLUT4 promoter in adipocytes.
- To identify and evaluate genetic variations within the GLUT4 gene in individuals with and without diabetes.
Main Methods:
- Isolation and sequencing of overlapping DNA fragments containing the human GLUT4 gene and promoter.
- Reporter gene assays (CAT gene) to assess promoter activity in 3T3-L1 adipocytes.
- Polymerase chain reaction (PCR) amplification and sequencing of the GLUT4 coding region and intron-exon junctions.
- Single-strand conformation polymorphism (SSCP) analysis to screen for mutations in diabetic and non-diabetic individuals.
Main Results:
- The complete sequence of the GLUT4 gene (~6.3 kb) and its promoter region (~2.0 kb) was determined.
- The GLUT4 promoter contains potential transcription factor binding sites but showed weak activity in transfection assays.
- Several genetic variants were identified, including a silent Asn130 substitution, a Val383Ile replacement, an intron 1 T>A substitution, and an Ile385Thr replacement.
- The Ile383 polymorphism was found in both diabetic and non-diabetic subjects.
Conclusions:
- The characterized GLUT4 gene and promoter sequence provide a basis for further functional studies.
- The identified genetic variations in the GLUT4 gene do not appear to be significantly associated with non-insulin-dependent diabetes mellitus (NIDDM).
- Further research may be needed to fully elucidate the role of GLUT4 regulation and potential minor genetic contributions to diabetes.
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