Karyotype Conservation in 2 Populations of the Parthenogenetic Scorpion Tityus serrulatus (Buthidae): rDNA and Its Associated Heterochromatin Are Concentrated on Only One Chromosome

Karyotype Conservation in 2 Populations of the Parthenogenetic Scorpion Tityus serrulatus (Buthidae): rDNA and Its Associated Heterochromatin Are Concentrated on Only One Chromosome

Autor Schneider, Marielle C. Autor UNIFESP Google Scholar
Cella, Doralice M. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Resumo Within the order Scorpiones, the parthenogenetic mode of reproduction has been described for 11 species, 6 of which belong to the genus Tityus. in this work, an investigation of the chromosome characteristics of 2 populations of Tityus serrulatus, the first scorpion species known to be thelytokously parthenogenetic, is described. An analysis of 40 individuals revealed holocentric chromosomes of large, medium, and small sizes and an invariable diploid number of 2n = 12. in addition to the conserved macrokaryotype structure, specific chromosome regions also appeared unchanged within and between the samples studied; that is, each sample displayed only one chromosome carrier of the active nucleolar organizer region containing ribosomal genes (5.8S, 18S, and 28S) and AT-rich heterochromatin associated with the ribosomal DNA. the high conservation of the chromosomal features observed in T. serrulatus differed from that verified in certain species of other groups of animals that possess both holocentric chromosomes and parthenogenetic reproduction. Moreover, the cytogenetic results obtained herein permit us to suggest how the eggs of T. serrulatus develop, whether by apomixis or automixis.
Assunto chromosome number
cytogenetic
evolution
holocentric chromosomes
macrokaryotype structure
nucleolar organizer
Idioma Inglês
Financiador Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Fundação para o Desenvolvimento da UNESP (FUNDUNESP)
Número do financiamento FAPESP: 06/53275-3
Data 2010-07-01
Publicado em Journal of Heredity. Cary: Oxford Univ Press Inc, v. 101, n. 4, p. 491-496, 2010.
ISSN 0022-1503 (Sherpa/Romeo, fator de impacto)
Editor Oxford Univ Press Inc
Extensão 491-496
Fonte http://dx.doi.org/10.1093/jhered/esq004
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000279430300010
URI http://repositorio.unifesp.br/handle/11600/32642

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