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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

B chromosomes in Brazilian rodents

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Author(s):
Silva, M. J. J. ; Yonenaga-Yassuda, Y. [2]
Total Authors: 2
Document type: Journal article
Source: Cytogenetic and Genome Research; v. 106, n. 2/4, p. 257-263, 2004.
Field of knowledge: Biological Sciences - Genetics
Abstract

B chromosomes are now known in eight Brazilian rodent species: Akodon montensis, Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens, Oryzomys angouya, Proechimys sp. 2 and Trinomys iheringi. 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: Akodon montensis and Oryzomys angouya. 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. (AU)

FAPESP's process: 99/11653-6 - Evolutionary studies in vertebrates: I. Cytogenetic, molecular and morphological analyses. II. Karyotypical survey of Brazilian fauna. III. Cell and tissue collection of mammals, lizards and amphibians
Grantee:Yatiyo Yonenaga-Yassuda
Support type: Research Projects - Thematic Grants
FAPESP's process: 98/05075-7 - Systematics, Evolution and Conservation of Eastern Brazilian Mammals
Grantee:Mario de Vivo
Support type: BIOTA-FAPESP Program - Thematic Grants