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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
4
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pubmed:dateCreated |
1996-1-22
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pubmed:abstractText |
Fifty-seven individuals of the European cyprinid fish species Scardinius erythrophthalmus were sexed by gonad histology, and their karyotypes were analyzed by Giemsa staining and C-banding. The chromosome number in somatic metaphase plates was 2n = 50. Karyotypes of all gonadal male animals were identical, consisting of 48 small meta- or submetacentric chromosomes and a pair of large metacentric chromosomes (ZZ males). Of the 33 gonadal females, 16 had a karyotype similar to the males' (ZW' females) and 17 had a heteromorphic pair of chromosomes, including a large metacentric Z chromosome and a small acrocentric W chromosome (ZW females). H-Y antigen typing with cells obtained from a variety of tissues revealed that the homogametic ZZ males were H-Y negative and the heterogametic ZW females were H-Y positive in all tissues tested. In contrast, ZW' females showed no expression of the H-Y antigen in somatic cells but were H-Y positive in ovarian cells. These results suggest that the ZW/ZW'/ZZ sex chromosomes of S. erythrophthalmus represent an unusual system of sex determination and that H-Y antigen expression is coupled with the heterogametic sex. Whether the ZW' individuals are indeed heterogametic females or actually sex-reversed ZZ males, in which chromosomal sex determination is overruled by external factors, is discussed.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:issn |
0301-0171
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
71
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
356-62
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pubmed:dateRevised |
2010-12-1
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pubmed:meshHeading |
pubmed-meshheading:8521724-Animals,
pubmed-meshheading:8521724-Cyprinidae,
pubmed-meshheading:8521724-Cytogenetics,
pubmed-meshheading:8521724-Female,
pubmed-meshheading:8521724-H-Y Antigen,
pubmed-meshheading:8521724-Hermaphroditic Organisms,
pubmed-meshheading:8521724-Karyotyping,
pubmed-meshheading:8521724-Male,
pubmed-meshheading:8521724-Sex Chromosomes,
pubmed-meshheading:8521724-Sex Determination Processes
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pubmed:year |
1995
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pubmed:articleTitle |
Evidence for an unusual ZW/ZW'/ZZ sex-chromosome system in Scardinius erythrophthalmus (Pisces, Cyprinidae), as detected by cytogenetic and H-Y antigen analyses.
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pubmed:affiliation |
Department of Human Genetics, Biozentrum, Am Hubland, Würzburg, Germany.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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