Literaturdatenbank
Literaturdatenbank |
|
 |
|
Zaborski, P., Dorizzi, M., & Pieau, C. (1982). H-y antigen expression in temperature sex-reversed turtles (emys orbicularis). Differentiation, 22(1), 73–78.
Added by: Admin (24 Aug 2008 20:04:53 UTC) Last edited by: Beate Pfau (09 May 2009 08:18:03 UTC) |
| Resource type: Journal Article BibTeX citation key: Zaborski1982a View all bibliographic details  |
Categories: General Keywords: Emydidae, Emys, Emys orbicularis, Haltung = husbandry, Schildkröten = turtles + tortoises, Zeitigung = incubation Creators: Dorizzi, Pieau, Zaborski Collection: Differentiation |
Views: 2/586
Views index: 10% Popularity index: 2.5% |
| Abstract |
|
As in many other turtles, the sexual differentiation of gonads in embryos of Emys orbicularis is temperature-sensitive, 100% phenotypic males being obtained below 27.5 degrees C and 100% phenotypic females above 29.5 degrees C. The expression of the serologically defined H-Y (SD-H-Y) antigen at both low and high temperatures has been shown to be different in gonads and in blood : in gonads, it is closely associated with ovarian structure, whereas in blood it is independent of sexual phenotype and appears to indicate sexual genotype. Both sexes differentiate at 28.5 degrees C, suggesting that at this intermediate (threshold) temperature, sexual differentiation of gonads conforms with sexual genotype. To test this hypothesis, the expression of SD-H-Y antigen has been carried out in blood cells of Emys individuals raised from eggs incubated at the threshold temperature (28.5 degrees C). All phenotypic males typed SD-H-Y negative, whereas most phenotypic females typed SD-H-Y positive. From this concordance between sexual phenotype of gonads and SD-H-Y phenotype of blood, we postulate that a ZZ male/ZW female mechanism of genotypic sex determination is revealed at the threshold temperature for gonad differentiation in Emys.
Added by: Admin Last edited by: Beate Pfau |