Step-by-step evolution of neo-sex chromosomes in geographical populations of wild silkmoths, Samia cynthia ssp

0358556 - BC 2012 RIV GB eng J - Journal Article
Yoshido, A. - Sahara, K. - Marec, František - Matsuda, Y.
Step-by-step evolution of neo-sex chromosomes in geographical populations of wild silkmoths, Samia cynthia ssp.
Heredity. Roč. 106, č. 4 (2011), s. 614-624. ISSN 0018-067X. E-ISSN 1365-2540
R&D Projects: GA AV ČR IAA600960925
Grant - others:Japan Society for the Promotion of Science(JP) 19-1114; Japan Society for the Promotion of Science(JP) 21-7147
Institutional research plan: CEZ:AV0Z50070508
Keywords : Lepidoptera * sex chromosomes * fluorescences
Subject RIV: EB - Genetics ; Molecular Biology
Impact factor: 4.597, year: 2011

Geographical subspecies of Samia cynthia (Lepidoptera: Saturniidae) differ considerably in sex chromosome constitution owing to sex chromosome fusions with autosomes (the so-called neo-chromosomes), which leads to variation in chromosome numbers. We cloned S. cynthia orthologues of 16 Bombyx mori genes, mapped them to chromosome spreads of S. cynthia subspecies by fluorescence in situ hybridization (FISH) to determine the origin of different parts of S. cynthia neo-sex chromosomes. Our results clearly showed a step-by-step evolution of the neo-sex chromosomes by repeated autosome-sex chromosome fusions. We suggest that the rearrangements of sex chromosomes may facilitate divergence of S. cynthia subspecies towards speciation.
Permanent Link: http://hdl.handle.net/11104/0196557