Reproductive isolation due to the genetic incompatibilities between Thrichomys pachyurus and two subspecies of Thrichomys apereoides (Rodentia, Echimyidae)

被引:22
作者
Borodin, PM [1 ]
Barreiros-Gomez, SC
Zhelezova, AI
Bonvicino, CR
D'Andrea, PS
机构
[1] Inst Oswaldo Cruz, Dept Trop Med, BR-20001 Rio De Janeiro, Brazil
[2] Russian Acad Sci, Inst Cytol & Genet, Novosibirsk 630090, Russia
[3] Natl Canc Inst, Div Genet, Rio De Janeiro, Brazil
关键词
hybrid sterility; speciation; chromosome rearrangements; meiosis; spermatogenesis; synaptonemal complex; Thrichomys;
D O I
10.1139/G05-096
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
We tested intrinsic reproductive isolation between 3 taxa of the South American caviomorph rodent Thrichomys (Rodentia, Echimyidae): T. pachyurus, T. apereoides subsp. apereoides and T. apereoides subsp. laurentius. They were mated in captivity and produced viable progeny. Some F-1 hybrid females were fertile, whereas all F-1 males were sterile. Histological examination revealed meiotic arrest at the primary spermatocyte stage. No sperm was detected in testes or epididymes. Electron microscopic analysis of surface spread synaptonemal complexes revealed a complete failure of chromosome pairing in F-1 hybrids of T. pachyurus with T. apereoides subsp. laurentius and T. apereoides subsp. apereoides. In the male hybrids between T. apereoides subsp. apereoides and T. apereoides subsp. laurentius, meiosis did not proceed beyond diplotene, although all of the chromosomes, including heteromorphic ones, paired in an orderly fashion. Backcross males with homomorphic karyotypes showed segregation in meiosis progression. This indicates that male hybrid sterility is due to genetic, but not chromosomal, incompatibility of the parental taxa.
引用
收藏
页码:159 / 167
页数:9
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