Chromosomal characteristics and karyotype evolution of Oxyopidae spiders (Araneae, Entelegynae)

Autor(es)

Stavale, L. M. ^[1] ; Schneider, M. C. ^[2] ; Brescovit, A. D. ^[3] ; Cella, D. M. ^[1]

Afiliação do(s) autor(es)

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

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

^[3] Inst Butantan, Lab Artropodes, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Genetics and Molecular Research; v. 10, n. 2, p. 752-763, 2011.
• Citações Web of Science: 10

Resumo

We made a cytogenetic analysis of four species of Oxyopidae and compared it with the karyotype data of all species of this family. In Hamataliwa sp, the mitotic cells showed 2n male = 26+X(1)X(2) and telocentric chromosomes. The 2n male = 28, which has been described for only one oxyopid spider, is the highest diploid number reported for this family. Peucetia species exhibited distinct karyotype characteristics, i.e., 2n male = 20+X(1)X(2) in P. flava and 2n male = 20+X in P. rubrolineata, revealing interspecific chromosome variability within this genus. However, both Peucetia species exhibited telocentric chromosomes. The most unexpected karyotype was encountered in Oxyopes salticus, which presented 2n male = 10+X in most individuals and a predominance of biarmed chromosomes. Additionally, one male of the sample of O. salticus was heterozygous for a centric fusion that originated the first chromosomal pair and exhibited one supernumerary chromosome in some cells. Testicular nuclei of Hamataliwa sp and O. salticus revealed NORs on autosomal pairs, after silver impregnation. The majority of Oxyopidae spiders have their karyotype differentiated by both reduction in diploid number chromosome number and change of the sex chromosome system to X type; however, certain species retain the ancestral chromosome constitution 2n = 26+X1X2. The most remarkable karyotype differentiation occurred in O. salticus studied here, which showed the lowest diploid number ever observed in Oxyopidae and the second lowest registered for Entelegynae spiders. (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