Sex Chromosome Evolution in Moths and Butterflies

Overview

Journal Chromosome Res

Date 2011 Dec 22

PMID 22187366

Citations 64

Authors

Ken Sahara

Atsuo Yoshido

Walther Traut

Affiliations

Soon will be listed here.

Abstract

Lepidoptera, i.e. moths and butterflies, have a female heterogametic sex chromosome system, with most females having a WZ constitution while males are ZZ. Besides this predominant WZ/ZZ system, Z/ZZ, WZ(1)Z(2)/Z(1)Z(1)Z(2)Z(2) and W(1)W(2)Z/ZZ systems also occur. Sex is determined by an unknown W-linked gene or genes in Bombyx mori, but by dosage-dependent and equally unknown Z-linked genes in all Z/ZZ species. The female heterogametic sex chromosome system has been conserved for at least 180 MY in the phylogenetic branch that combines Lepidoptera and Trichoptera. The W chromosome, which is present in most lepidopteran species, was incorporated in the sex chromosome system much later, about 90-100 MY ago. The Z chromosomes are highly conserved among Lepidoptera, much like the Z in birds or the X in mammals. The W, on the other hand, is evolving rapidly. It is crammed with repetitive elements which appear to have a high turnover rate but poor in or even devoid of protein-coding genes. It has frequently undergone fusion with autosomes or sporadically lost altogether.

Citing Articles

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