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Meiotic analyses of the sex chromosomes in Carolliinae-Phyllostomidae (Chiroptera): NOR separates the XY 1 Y 2 into two independent parts

2004; University of Florence; Volume: 57; Issue: 1 Linguagem: Inglês

10.1080/00087114.2004.10589365

2165-5391

Renata Coelho Rodrigues Noronha, Cleusa Yoshiko Nagamachi, Júlio César Pieczarka, Suely Aparecida Marques-Aguiar, Maria De Fátima Lima De Assis, Regina Maria de Souza Barros,

Hemiptera Insect Studies

Abstract - Meiotic analyses of the sex chromosomes were made in two different species belonging to the subfamily Carollinae (Phyllostomidae, Chiroptera): Rhinophylla pumilio and Carollia perspicillata. These species have different sex chromosome systems. Through banding techniques, chromosomes homologies between Carollia perspicillata and Rhinophylla pumilio were not found, possibly because Carollia species have highly rearranged chromosomes. Probably, Rhinophylla is better associated to Phyllostomini tribe. Sex vesicle pairing behavior at the meiotic prophase was analyzed in both species. R. pumilio had a simple sex chromosome system (XX/XY), the XY pair showed an asynchronic behavior compared to the autosomal bivalents. The sex vesicle showes the X and Y pairing in the pseudoautosomal region. Moreover, a folding of the X-asynaptic axis on itself and condensed differentiated axes were also identified. In C. perspicillata, with a multiple sex chromosome system (XY1Y2), the segments Xp-Y1 and Xq-Y2 paired independently from each other. Compared to the autosomes, the sex vesicle showed a precocious pairing behavior. In C. perspicillata, a NOR stained with silver was localized in the X rearranged chromosome. Possibly, this region separates the XY1Y2 trivalent in two independent parts: one involving the X and Y2 autosomal with transcriptional activity, and the other corresponding to the original X and Y sex pair.