In:
Comparative Cytogenetics, Pensoft Publishers, Vol. 13, No. 2 ( 2019-05-14), p. 17-28
Abstract:
Reptiles are good objects for studying the evolution of sex determination, since they have different sex determination systems in different lineages. Lacertid lizards have been long-known for possessing ZZ/ZW type sex chromosomes. However, due to morphological uniformity of lacertid chromosomes, the Z chromosome has been only putatively cytologically identified. We used lampbrush chromosome (LBC) analysis and FISH with a W-specific probe in Eremiasvelox (Pallas, 1771) to unequivocally identify the ZW bivalent and investigate its meiotic behavior. The heterochromatic W chromosome is decondensed at the lampbrush stage, indicating active transcription, contrast with the highly condensed condition of the lampbrush W chromosomes in birds. We identified the Z chromosome by its chiasmatic association with the W chromosome as chromosome XIII of the 19 chromosomes in the LBC karyotype. Our findings agree with previous genetic and genomic studies, which suggested that the lacertid Z chromosome should be one of the smaller macrochromosomes.
Type of Medium:
Online Resource
ISSN:
1993-078X
,
1993-0771
DOI:
10.3897/CompCytogen.v13i2.34116
DOI:
10.3897/CompCytogen.v13i2.34116.suppl1
Language:
Unknown
Publisher:
Pensoft Publishers
Publication Date:
2019
detail.hit.zdb_id:
2572457-5
SSG:
12
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