Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/36658
Título: Cytogenetic analysis of three ctenidae species (Araneae) from the Amazon
Autor: Pinto Neto, José Paulo da Costa
Goll, Leonardo Gusso
Gross, Maria Claudia
Feldsberg, Eliana
Schneider, Carlos Henrique
Palavras-chave: Centromere
Chromosome Analysis
clinical article
Constitutive Heterochromatin
Meiosis
Nonhuman
Sex Chromosome
Spider
Data do documento: 2020
Revista: Genetics and Molecular Biology
É parte de: Volume 43, Número 4
Abstract: Cytogenetic characterization was performed on three wandering spiders: Ctenus amphora Mello-Leitão, 1930, C. crulsi Mello-Leitão, 1930 and C. villasboasi Mello-Leitão, 1949. The three species had similar karyotypes, with 2n = 28 (26 + X1 X2 0) in males, with sex chromosomes exhibiting positive heteropicnosis in meiotic cells. 18S rDNA mapping revealed gene sites at the terminal region of one chromosomal pair for all species, with one C. cruls individual, showing markings in two pairs. C. villasboasi showed markers only in the pachytene phase. The distribution pattern of constitutive heterochromatin was found to be characteristic for the genus, with markings in the centromeric region of all chromo-somes, suggesting an acrocentric morphology for all chromosomes of the three analysed species. The results support the fusion of sex chromosomes as an evolutionary tendency for this spider group. © 2020, Sociedade Brasileira de Genética.
DOI: 10.1590/1678-4685-GMB-2020-0069
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