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Genetic architecture of variation in sex-comb tooth number in Drosophila simulans

Published online by Cambridge University Press:  19 May 2006

HARUKI TATSUTA  and
TOSHIYUKI TAKANO-SHIMIZU
HARUKI TATSUTA
Affiliation:
Department of Population Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan Present address: Laboratory of Ecological Risk Assessment, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-8506, Japan.
TOSHIYUKI TAKANO-SHIMIZU
Affiliation:
Department of Population Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan School of Advanced Sciences, The Graduate University for Advanced Studies (SOKENDAI), Shonan Village, Hayama, Kanagawa 240-0193, Japan
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Abstract

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The sex comb on the forelegs of Drosophila males is a secondary sexual trait, and the number of teeth on these combs varies greatly within and between species. To understand the relationship between the intra- and interspecific variation, we performed quantitative trait locus (QTL) analyses of the intraspecific variation in sex-comb tooth number. We used five mapping populations derived from two inbred Drosophila simulans strains that were divergent in the number of sex-comb teeth. Although no QTLs were detected on the X chromosome, we identified four QTLs on the second chromosome and three QTLs on the third chromosome. While identification and estimated effects of the second-chromosome QTLs depend on genetic backgrounds, significant and consistent effects of the two third-chromosome QTLs were found in two genetic backgrounds. There were significant epistatic interactions between a second-chromosome QTL and a third-chromosome QTL, as well as between two second-chromosome QTLs. The third-chromosome QTLs are concordant with the locations of the QTLs responsible for the previously observed differences in sex-comb tooth number between D. simulans and D. mauritiana.

Type
Research Article
Information
Genetics Research , Volume 87 , Issue 2 , April 2006 , pp. 93 - 107
Copyright
2006 Cambridge University Press