Chromosomes of Theridiidae spiders (Entelegynae): interspecific karyotype diversity in Argyrodes and diploid number intraspecific variability in Nesticodes rufipes

Chromosomes of Theridiidae spiders (Entelegynae): interspecific karyotype diversity in Argyrodes and diploid number intraspecific variability in Nesticodes rufipes

Author Stavale, Leila Miguel Google Scholar
Schneider, Marielle Cristina Autor UNIFESP Google Scholar
Araujo, Douglas Google Scholar
Brescovit, Antonio Domingos Google Scholar
Cella, Doralice Maria Google Scholar
Institution Universidade Estadual Paulista (UNESP)
Universidade Federal de São Paulo (UNIFESP)
Universidade Estadual de Mato Grosso do Su
Instituto Butantan Laboratório de Artrópodes
Abstract Theridiidae is a derived family within the Araneoidea clade. In contrast to closely related groups, the 2n(male) = 20+X1X2 with acro/telocentric chromosomes is the most widespread karyotype among the theridiid spiders. In this work, the cytogenetic analysis of Argyrodes elevatus revealed original chromosome features different from those previously registered for Theridiidae, including the presence of 2n(male) = 20+X with meta/submetacentric chromosomes. Most individuals of Nesticodes rufipes showed family conserved karyotype characteristics. However, one individual had a 2n(male) = 24 due to the presence of an extra chromosome pair, which exhibited regular behavior and reductional segregation during meiosis. After silver staining, mitotic cells exhibited NORs localized on the terminal regions of the short arms of pairs 2, 3, and 4 of A. elevatus and on the terminal regions of long arms of pair 4 of N. rufipes. The comparative analysis with data from phylogenetically related species allowed the clarification of the origin of the interspecific and intraspecific chromosome variability observed in Argyrodes and in N. rufipes, respectively.
Keywords chromosome morphology
cytogenetic
meiosis
nucleolar organizer region
sex chromosome system
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number FAPESP: 06/53275-3
FAPESP: 08/55633-0
Date 2010-01-01
Published in Genetics and Molecular Biology. Sociedade Brasileira de Genética, v. 33, n. 4, p. 663-668, 2010.
ISSN 1415-4757 (Sherpa/Romeo, impact factor)
Publisher Sociedade Brasileira de Genética
Extent 663-668
Origin http://dx.doi.org/10.1590/S1415-47572010005000076
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000286321000012
SciELO ID S1415-47572010000400012 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/5567

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