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BIBTEX RIS

B chromosomes in Brazilian rodents

2004; Karger Publishers; Volume: 106; Issue: 2-4 Linguagem: Inglês

10.1159/000079296

1424-8581

Maria José de Jesus Silva, Yatiyo Yonenaga-Yassuda,

DNA Repair Mechanisms

B chromosomes are now known in eight Brazilian rodent species: <i>Akodon montensis, Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens, Oryzomys angouya, Proechimys</i> sp. 2 and <i>Trinomys iheringi</i>. Typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of NORs, and presence/absence of interstitial telomeric signals after FISH. In most cases, Bs are heterochromatic and late replicating. Active NORs were detected in two species: <i>Akodon montensis</i> and <i>Oryzomys angouya</i>. As a rule, Bs behave as uni or bivalents in meiosis, there is no pairing between Bs and autosomes or sex chromosomes and also their synaptonemal complexes are isopycnotic with those in A chromosomes.