Molecular cytogenetics of Androctonus scorpions: an oasis of calm in the turbulent karyotype evolution of the diverse family Buthidae
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Tarih
2015
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Oxford Univ Press
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Recent cytogenetic and genomic studies suggest that morphological and molecular evolution is decoupled in the basal arachnid order Scorpiones. Extraordinary karyotype variation has been observed particularly in the family Buthidae, which is unique among scorpions for its holokinetic chromosomes. We analyzed the karyotypes of four geographically distant species of the genus AndroctonusEhrenberg, 1828 (Androctonus australis, Androctonus bourdoni, Androctonus crassicauda, Androctonus maelfaiti) (Scorpiones: Buthidae) using both classic and molecular cytogenetic methods. The mitotic complement of all species consisted of 2n=24 elements. Fluorescence in situ hybridization with a fragment of the 18S ribosomal RNA gene, a cytogenetic marker well known for its mobility, identified a single interstitial rDNA locus on the largest chromosome pair in all species examined. Our findings thus support the evolutionary stasis of the Androctonus karyotype, which is discussed with respect to current hypotheses on chromosome evolution both within and beyond the family Buthidae. Differences in karyotype dynamics between Androctonus spp. and the other buthids can help us better understand the driving forces behind their chromosome evolution and speciation.(c) 2015 The Linnean Society of London, Biological Journal of the Linnean Society, 2015, 115, 69-76.
Açıklama
Anahtar Kelimeler
18S rDNA, FISH, holocentric chromosomes, holokinetic drive, multivalent association
Kaynak
Biological Journal of the Linnean Society
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
115
Sayı
1
