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Cytogenetic analysis of five Ctenidae species (Araneae): detection of heterochromatin and 18S rDNA sites. | LitMetric

Cytogenetic analysis of five Ctenidae species (Araneae): detection of heterochromatin and 18S rDNA sites.

Comp Cytogenet

Laboratory of Animal Cytogenetics; Department of General Biology, CCB, Universidade Estadual de Londrina. Rodovia Celso Garcia Cid, PR 445, km 380, Londrina-Brasil.

Published: September 2017

AI Article Synopsis

Article Abstract

The present study aimed to cytogenetically analyse five Ctenidae species (Keyserling, 1877), (Keyserling, 1891), (Keyserling, 1891), (Simon, 1906), and (Philip Bertkau, 1880), from Brazil. All species presented a 2n♂ = 28 except for , which showed 2n♂ = 29. Analysis of segregation and behavior of sex chromosomes during male meiosis showed a sex chromosome system of the type XX0 in species with 28 chromosomes and XXX0 in . C banding stained with fluorochromes CMA and DAPI revealed two distributions patterns of GC-rich heterochromatin: (i) in terminal regions of most chromosomes, as presented in , , and and (ii) in interstitial regions of most chromosomes, in addition to terminal regions, as observed for . The population of Ubatuba (São Paulo State) of this same species displayed an additional accumulation of GC-rich heterochromatin in one bivalent. Fluorescent in situ hybridization revealed that this bivalent corresponded to the NOR-bearing chromosome pair. All analyzed species have one bivalent with 18S rDNA site, except , which has three bivalents with 18S rDNA site. Karyotypes of two species, and , are described for the first time. The latter species is the first karyotyped representative of the subfamily Acantheinae. Finally, 18S rDNA probe is used for the first time in Ctenidae at the present study.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5672157PMC
http://dx.doi.org/10.3897/CompCytogen.v11i4.10620DOI Listing

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