Quantitative variation in obesity-related traits and insulin precursors linked to the OB gene region on human chromosome 7
Abstract
Despite the evidence that human obesity has strong genetic determinants, efforts at identifying specific genes that influence human obesity have largely been unsuccessful. Using the sibship data obtained from 32 low-income Mexican American pedigrees ascertained on a type II diabetic proband and a multipoint variance-components method, we tested for linkage between various obesity-related traits plus associated metabolic traits and 15 markers on human chromosome 7. We found evidence for linkage between markers in the OB gene region and various traits, as follows: D7S514 and extremity skinfolds (LOD = 3.1), human carboxypeptidase A1 (HCPA1) and 32,33-split proinsulin level (LOD = 4.2), and HCPA1 and proinsulin level (LOD = 3.2). A putative susceptibility locus linked to the marker D7S514 explained 56% of the total phenotypic variation in extremity skinfolds. Variation at the HCPA1 locus explained 64% of phenotypic variation in proinsulin level and {approximately}73% of phenotypic variation in split proinsulin concentration, respectively. Weaker evidence for linkage to several other obesity-related traits (e.g., waist circumference, body-mass index, fat mass by bioimpedance, etc.) was observed for a genetic location, which is {approximately}15 cM telomeric to OB. In conclusion, our study reveals that the OB region plays a significant role in determining the phenotypic variationmore »
- Authors:
-
- Univ. of Texas Health Science Center, San Antonio, TX (United States); and others
- Publication Date:
- OSTI Identifier:
- 478517
- Resource Type:
- Journal Article
- Journal Name:
- American Journal of Human Genetics
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 3; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 55 BIOLOGY AND MEDICINE, BASIC STUDIES; HUMAN CHROMOSOME 7; GENETIC MAPPING; PATIENTS; HEREDITARY DISEASES; METABOLIC DISEASES; PHENOTYPE; GENES; GENETIC VARIABILITY; INSULIN; STATISTICS; BIOLOGICAL MARKERS
Citation Formats
Duggirala, R, Stern, M P, and Reinhart, L J. Quantitative variation in obesity-related traits and insulin precursors linked to the OB gene region on human chromosome 7. United States: N. p., 1996.
Web.
Duggirala, R, Stern, M P, & Reinhart, L J. Quantitative variation in obesity-related traits and insulin precursors linked to the OB gene region on human chromosome 7. United States.
Duggirala, R, Stern, M P, and Reinhart, L J. 1996.
"Quantitative variation in obesity-related traits and insulin precursors linked to the OB gene region on human chromosome 7". United States.
@article{osti_478517,
title = {Quantitative variation in obesity-related traits and insulin precursors linked to the OB gene region on human chromosome 7},
author = {Duggirala, R and Stern, M P and Reinhart, L J},
abstractNote = {Despite the evidence that human obesity has strong genetic determinants, efforts at identifying specific genes that influence human obesity have largely been unsuccessful. Using the sibship data obtained from 32 low-income Mexican American pedigrees ascertained on a type II diabetic proband and a multipoint variance-components method, we tested for linkage between various obesity-related traits plus associated metabolic traits and 15 markers on human chromosome 7. We found evidence for linkage between markers in the OB gene region and various traits, as follows: D7S514 and extremity skinfolds (LOD = 3.1), human carboxypeptidase A1 (HCPA1) and 32,33-split proinsulin level (LOD = 4.2), and HCPA1 and proinsulin level (LOD = 3.2). A putative susceptibility locus linked to the marker D7S514 explained 56% of the total phenotypic variation in extremity skinfolds. Variation at the HCPA1 locus explained 64% of phenotypic variation in proinsulin level and {approximately}73% of phenotypic variation in split proinsulin concentration, respectively. Weaker evidence for linkage to several other obesity-related traits (e.g., waist circumference, body-mass index, fat mass by bioimpedance, etc.) was observed for a genetic location, which is {approximately}15 cM telomeric to OB. In conclusion, our study reveals that the OB region plays a significant role in determining the phenotypic variation of both insulin precursors and obesity-related traits, at least in Mexican Americans. 66 refs., 3 figs., 4 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/478517},
journal = {American Journal of Human Genetics},
number = 3,
volume = 59,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1996},
month = {Sun Sep 01 00:00:00 EDT 1996}
}