Journal
CYTOGENETIC AND GENOME RESEARCH
Volume 145, Issue 3-4, Pages 218-229Publisher
KARGER
DOI: 10.1159/000431211
Keywords
Anuran; Buergeria; Chromosome homology; Comparative map; FISH; Sex chromosome; Xenopus
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [23113004, 22370081]
- Grants-in-Aid for Scientific Research [22370081, 26830144] Funding Source: KAKEN
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Sex determination in frogs (anurans) is genetic and includes both male and female heterogamety. However, the origins of the sex chromosomes and their differentiation processes are poorly known. To investigate diversity in the origins of anuran sex chromosomes, we compared the chromosomal locations of sex-linked genes in 4 species: the African clawed frog (Xenopus laevis), the Western clawed frog (Silurana/X. tropicalis), the Japanese bell-ring frog (Buergeria buergeri), and the Japanese wrinkled frog (Rana rugosa). Comparative mapping data revealed that the sex chromosomes of X. laevis, X. tropicalis and R. rugosa are different chromosome pairs; however, the sex chromosomes of X. tropicalis and B. buergeri are homologous, although this may represent distinct evolutionary origins. We also examined the status of sex chromosomal differentiation in B. buergeri, which possesses heteromorphic ZW sex chromosomes, using comparative genomic hybridization and chromosome painting with DNA probes from the microdissected W chromosome. At least 3 rearrangement events have occurred in the proto-W chromosome: deletion of the nucleolus organizer region and a paracentric inversion followed by amplification of non-W-specific repetitive sequences. (C) 2015 S. Karger AG, Basel
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