Chromosomal diversity in three species of Lycosa Latreille, 1804 (Araneae, Lycosidae): Inferences on diversification of diploid number and sexual chromosome systems in Lycosinae
Título del documento: Chromosomal diversity in three species of Lycosa Latreille, 1804 (Araneae, Lycosidae): Inferences on diversification of diploid number and sexual chromosome systems in Lycosinae
Revista: Genetics and molecular biology
Base de datos: PERIÓDICA
Número de sistema: 000459219
ISSN: 1415-4757
Autores: 1
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2
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Instituciones: 1Universidade Estadual de Londrina, Departamento de Biologia Geral, Londrina, Parana. Brasil
2Instituto Butantan, Laboratorio de Colecoes Zoologicas, Sao Paulo. Brasil
Año:
Volumen: 45
Número: 1
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental, analítico
Resumen en inglés Lycosa is one of the most speciose genera in Lycosidae, including species with different sexual chromosome systems (SCS). We carried out cytogenetic analyses in three species of Lycosa, revealing that L. erythrognatha and L. sericovittata share 2n ♂ = 22 and SCS X1X20 while L. gr. nordenskjoldi presents 2n ♂ = 19 and SCS XO, composed only of acrocentric chromosomes. All species shared pericentromeric heterochromatin. Nonetheless, one specimen of L. sericovittata carried two chromosomes with terminal heterochromatin and L. gr. nordenskjoldi showed four chromosomes with interstitial heterochromatin plus another chromosome with terminal C-bands. The pericentromeric heterochromatin of all species as well as the terminal heterochromatic blocks in L. sericovittata were CMA3+. The 18S rDNA sites varied in number and type of bearing chromosomes both at inter and intrapopulational levels, with the highest variation in L. gr. nordenskjoldi. These differences may be related to gene dispersal due to the influence of transposition elements and translocation events. Despite these variations, all species shared ribosomal sites in pair 5. This study demonstrated intra and interspecific chromosomal variability of Lycosa, suggesting that chromosomal rearrangements are related to the diversification of diploid number and SCS in this group of spiders
Disciplinas: Biología
Palabras clave: Genética,
Artrópodos,
Lycosa,
Arañas,
Variación cromosómica,
Cromosomas sexuales,
Heterocromatina
Keyword: Genetics,
Arthropods,
Lycosa,
Spiders,
Heterochromatin,
Chromosomal variation,
Sex chromosomes
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