Mapping Main, Epistatic and Sex-specific QTL for Body Composition in a Chicken Population Divergently Selected for Low or High Growth Rate

Overview

Journal BMC Genomics

Publisher Biomed Central

Specialty Genetics

Date 2010 Feb 13

PMID 20149241

Citations 19

Authors

Georgina A Ankra-Badu

Daniel Shriner

Elisabeth Le Bihan-Duval

Sandrine Mignon-Grasteau

Frederique Pitel

Catherine Beaumont

Michel J Duclos

Jean Simon

Tom E Porter

Alain Vignal

Larry A Cogburn

David B Allison

Nengjun Yi

Samuel E Aggrey

Affiliations

Soon will be listed here.

Abstract

Background: Delineating the genetic basis of body composition is important to agriculture and medicine. In addition, the incorporation of gene-gene interactions in the statistical model provides further insight into the genetic factors that underlie body composition traits. We used Bayesian model selection to comprehensively map main, epistatic and sex-specific QTL in an F2 reciprocal intercross between two chicken lines divergently selected for high or low growth rate.

Results: We identified 17 QTL with main effects across 13 chromosomes and several sex-specific and sex-antagonistic QTL for breast meat yield, thigh + drumstick yield and abdominal fatness. Different sets of QTL were found for both breast muscles [Pectoralis (P) major and P. minor], which suggests that they could be controlled by different regulatory mechanisms. Significant interactions of QTL by sex allowed detection of sex-specific and sex-antagonistic QTL for body composition and abdominal fat. We found several female-specific P. major QTL and sex-antagonistic P. minor and abdominal fatness QTL. Also, several QTL on different chromosomes interact with each other to affect body composition and abdominal fatness.

Conclusions: The detection of main effects, epistasis and sex-dimorphic QTL suggest complex genetic regulation of somatic growth. An understanding of such regulatory mechanisms is key to mapping specific genes that underlie QTL controlling somatic growth in an avian model.

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