Insights into the origin of the high variability of multivalent-meiotic associations in holocentric chromosomes of Tityus (Archaeotityus) scorpions

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dc.citation.issue2
dc.citation.volume13
dc.contributor.authorMattos, Viviane Fagundes
dc.contributor.authorCarvalho Currency, Leonardo Sousa
dc.contributor.authorCarvalho, Marcos Andre
dc.contributor.authorSchneider, Marielle Cristina [UNIFESP]
dc.coverageSan Francisco
dc.date.accessioned2020-07-08T13:09:39Z
dc.date.available2020-07-08T13:09:39Z
dc.date.issued2018
dc.description.abstractScorpions represent an intriguing group of animals characterized by a high incidence of heterozygous chromosomal rearrangements. In this work, we examined six species of Tityus (Archaeotityus) from Brazilian fauna with a particular focus on elucidating the rearrangements responsible for the intraspecific variability of diploid number and the presence of long chromosomal chains in meiosis. To access any interpopulation diversity, we also studied individuals from four species representing distinct localities. Most species demonstrated intraspecific polymorphism in diploid number (2n = 19 and 2n = 20 in T. clathratus, T. mattogrossensis, and T. pusillus, 2n = 16, 2n = 17 and 2n = 18 in T. paraguayensis, and 2n = 16 and 2n = 24 in T. silvestris) and multi-chromosomal associations during meiosis I, which differed even among individuals with the same chromosome number. In some species, the heterozygous rearrangements were not fixed, resulting such as in Tityus clathatrus, in 11 different chromosomal configurations recognized within a same population. Based on meiotic chromosome behaviour, we suggested that independent rearrangements (fusion/fission and reciprocal translocations), occurring in different combinations, originated the multi-chromosomal chains. To evaluate the effects of these chromosome chains on meiotic segregation, we applied the chi-square test in metaphase II cells. The non-significant occurrence of aneuploid nuclei indicated that non-disjunction was negligible in specimens bearing heterozygous rearrangements. Finally, based on our analysis of many chromosome characteristics, e.g., holocentricity, achiasmate meiosis, endopolyploidy, ability to segregate heterosynaptic or unsynapsed chromosomes, (TTAGG) n sequence located in terminal regions of rearranged chromosomes, we suggest that the maintenance of multi-chromosomal associations may be evolutionarily advantageous for these species.en
dc.description.affiliationUniv Estadual Paulista, UNESP, Dept Biol, Sao Paulo, Brazil
dc.description.affiliationUniv Fed Piaui, UFPI, Campus Almicar Ferreira Sobral Floriano, Piaui, Brazil
dc.description.affiliationUniv Fed Mato Grosso, Dept Biol & Zool, Cuiaba, Mato Grosso, Brazil
dc.description.affiliationUniv Fed Sao Paulo, UNIFESP, Dept Ecol & Biol Evolut, Sao Paulo, Brazil
dc.description.affiliationUniv Fed Minas Gerais, Posgrad Zool, Belo Horizonte, MG, Brazil
dc.description.affiliationUnifespUniv Fed Sao Paulo, UNIFESP, Dept Ecol & Biol Evolut, Sao Paulo, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipFundacao de Amparo a Pesquisa do Estado de Sao Paulo
dc.description.sponsorshipIDFAPESP: 2011/21643-1, 2013/11840-0
dc.format.extent-
dc.identifierhttp://dx.doi.org/10.1371/journal.pone.0192070
dc.identifier.citationPlos One. San Francisco, v. 13, n. 2, p. -, 2018.
dc.identifier.doi10.1371/journal.pone.0192070
dc.identifier.fileWOS000425604300027.pdf
dc.identifier.issn1932-6203
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/54115
dc.identifier.wosWOS:000425604300027
dc.language.isoeng
dc.publisherPublic Library Science
dc.relation.ispartofPlos One
dc.rightsAcesso aberto
dc.titleInsights into the origin of the high variability of multivalent-meiotic associations in holocentric chromosomes of Tityus (Archaeotityus) scorpionsen
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