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

Autor(es)

Stavale, Leila Miguel ^[1] ; Schneider, Marielle Cristina ^[2] ; Araujo, Douglas ^[3] ; Brescovit, Antonio Domingos ^[4] ; Cella, Doralice Maria ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Biol, Rio Claro, SP - Brazil

^[2] Univ Fed Sao Paulo, Dept Ciencias Biol, BR-09972270 Diadema, SP - Brazil

^[3] Univ Estadual Mato Grosso Sul, Unidade Univ Mundo Novo, Mundo Novo, MS - Brazil

^[4] Inst Butantan, Lab Artropodes, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GENETICS AND MOLECULAR BIOLOGY; v. 33, n. 4, p. 663-668, 2010.
• Citações Web of Science: 5

Resumo

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. (AU)

• Processo FAPESP: 06/53275-3 - Diferenciação evolutiva entre os cromossomos holocêntricos e monocêntricos em algumas espécies de escorpiões da fauna brasileira, detectada pela análise ultraestrutural do complexo sinaptonêmico e regiões associadas, heterocromatina constitutiva e região organizadora de nucléolo
• Beneficiário: Marielle Cristina Schneider
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 08/55633-0 - Cariótipo, comportamento dos cromossomos na meiose e região organizadora de nucléolo de Oxypes salticus, Peucetia rubrolineata (Oxyopidae), Argyrodes elevatus e Nesticodes rufipes (Theridiidae) (Araneae, Araneomorphae, Entelegynae)
• Beneficiário: Leila Miguel Stavale
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica