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XX/XY sex chromosomes in a blind lizard (Dibamidae): Towards understanding the evolution of sex determination in squamates
Journal of Evolutionary Biology Số 12, năm 2022 (Tập 35, trang 1791-1796)
ISSN: 1010061X
ISSN: 1010061X
DOI: 10.1111/jeb.14123
Tài liệu thuộc danh mục:
Article
English
Từ khóa: Animals; Lizards; Sex Chromosomes; Snakes; X Chromosome; Y Chromosome; animal; genetics; lizard; sex chromosome; snake; X chromosome; Y chromosome
Tóm tắt tiếng anh
The reconstruction of the evolutionary history of sex determination in squamate reptiles (lizards and snakes) is complicated by missing data in many lineages, erroneous reports, and often questionable inferences on state homology. Therefore, despite the large effort, the reconstruction of the ancestral sex determination in squamate reptiles is still controversial. With the hope to shed light on this problem, we aspired to identify the sex chromosome gene content in Dibamus deharvengi, the representative of the family Dibamidae, the putative sister clade to all other squamates. Our analyses revealed XX/XY sex-determination system in D. deharvengi: the X chromosome contains genes with homologues scattered across chicken chromosomes 8, 12, 13, 18, 30, and 33, and the Y chromosome seems to largely degenerate. To the best of our knowledge, this combination has never been reported to form sex chromosomes in any amniote lineage. It suggests that the sex chromosomes can represent an apomorphy of a clade including D. deharvengi. Our findings cover an important gap in the knowledge of sex determination in reptiles and further support multiple independent origins of sex chromosomes in this group. 2022 European Society for Evolutionary Biology.