A female-heterogametic sex chromosome system originating from a B chromosome which acquired a role as a W sex chromosome as it occurs only in females and not in males, and it seems to carry a dominant female determining allele (molecular details yet unknown). The only known case is the New Zealand frog, Leiopelma hochstetteri. Another possible (suspected) case would be in tetra fish Astyanax scabripinnis.
Suggested parent term
0 as sex chromosome notation
karyotype
genotype
genomic genotype
heterogametic sex genotype
sex determination
sex chromosome GO:0000803
Attribution
0000-0003-4441-9615
Additional context
By analogy, in Astyanax mexicanus, a B chromosome has been found to carry a gdf6 gene duplicate which seems to determine a male sex in this fish. This situation may be denoted as ♂Y0/♀00.
Suggested literature:
Green, D.M. Cytogenetics of the endemic New Zealand frog, Leiopelma hochstetteri: extraordinary supernumerary chromosome variation and a unique sex-chromosome system. Chromosoma 97, 55–70 (1988). https://doi.org/10.1007/BF00331795
Imarazene, B., Du, K., Beille, S., Jouanno, E., Feron, R., Pan, Q., ... & Guiguen, Y. (2021). A supernumerary “B-sex” chromosome drives male sex determination in the Pachón cavefish, Astyanax mexicanus. Current Biology, 31(21), 4800-4809. https://doi.org/10.1016/j.cub.2021.08.030
Jonika, M. M., Alfieri, J. M., Sylvester, T., Buhrow, A. R., & Blackmon, H. (2022). Why not Y naught. Heredity, 129(2), 75-78. https://doi.org/10.1038/s41437-022-00543-z
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Preferred term label
W0
Synonyms
♀W0/♂00
Textual definition
A female-heterogametic sex chromosome system originating from a B chromosome which acquired a role as a W sex chromosome as it occurs only in females and not in males, and it seems to carry a dominant female determining allele (molecular details yet unknown). The only known case is the New Zealand frog, Leiopelma hochstetteri. Another possible (suspected) case would be in tetra fish Astyanax scabripinnis.
Suggested parent term
0 as sex chromosome notation karyotype genotype genomic genotype heterogametic sex genotype sex determination sex chromosome GO:0000803
Attribution
0000-0003-4441-9615
Additional context
By analogy, in Astyanax mexicanus, a B chromosome has been found to carry a gdf6 gene duplicate which seems to determine a male sex in this fish. This situation may be denoted as ♂Y0/♀00.
Suggested literature:
Green, D.M. Cytogenetics of the endemic New Zealand frog, Leiopelma hochstetteri: extraordinary supernumerary chromosome variation and a unique sex-chromosome system. Chromosoma 97, 55–70 (1988). https://doi.org/10.1007/BF00331795
Imarazene, B., Du, K., Beille, S., Jouanno, E., Feron, R., Pan, Q., ... & Guiguen, Y. (2021). A supernumerary “B-sex” chromosome drives male sex determination in the Pachón cavefish, Astyanax mexicanus. Current Biology, 31(21), 4800-4809. https://doi.org/10.1016/j.cub.2021.08.030
Jonika, M. M., Alfieri, J. M., Sylvester, T., Buhrow, A. R., & Blackmon, H. (2022). Why not Y naught. Heredity, 129(2), 75-78. https://doi.org/10.1038/s41437-022-00543-z
Code of Conduct