High chromosome variability and the presence of multivalent associations in buthid scorpions

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorMattos, Viviane Fagundes
dc.creatorCella, Doralice Maria
dc.creatorCarvalho, Leonardo Sousa
dc.creatorCandido, Denise Maria
dc.creatorSchneider, Marielle Cristina
dc.date2014-05-27T11:28:44Z
dc.date2016-10-25T18:45:57Z
dc.date2014-05-27T11:28:44Z
dc.date2016-10-25T18:45:57Z
dc.date2013-04-01
dc.date.accessioned2017-04-06T02:17:51Z
dc.date.available2017-04-06T02:17:51Z
dc.identifierChromosome Research, v. 21, n. 2, p. 121-136, 2013.
dc.identifier0967-3849
dc.identifier1573-6849
dc.identifierhttp://hdl.handle.net/11449/74903
dc.identifierhttp://acervodigital.unesp.br/handle/11449/74903
dc.identifier10.1007/s10577-013-9342-3
dc.identifierWOS:000317688800003
dc.identifier2-s2.0-84880572855
dc.identifierhttp://dx.doi.org/10.1007/s10577-013-9342-3
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/895662
dc.descriptionIn this study, we investigated the mitotic and meiotic chromosomes of 11 Buthidae scorpion species, belonging to three genera (Ananteris, Rhopalurus and Tityus), to obtain detailed knowledge regarding the mechanisms underlying the intraspecific and/or interspecific diversity of chromosome number and the origin of the complex chromosome associations observed during meiosis. The chromosomes of all species did not exhibit a localised centromere region and presented synaptic and achiasmatic behaviour during meiosis I. Spermatogonial and/or oogonial metaphase cells of these buthids showed diploid numbers range from 2n = 6 to 2n = 28. In most species, multivalent chromosome associations were observed in pachytene and postpachytene nuclei. Moreover, intraspecific variability associated with the presence or absence of chromosome chains and the number of chromosomes in the complex meiotic configurations was observed in some species of these three genera. Silver-impregnated cells revealed that the number and location of nucleolar organiser regions (NORs) remained unchanged despite extensive chromosome variation; notably, two NORs located on the terminal or subterminal chromosome regions were commonly observed for all species. C-banded and fluorochrome-stained cells showed that species with conspicuous blocks of heterochromatin exhibited the lowest rate of chromosomal rearrangement. Based on the investigation of mitotic and meiotic cells, we determined that the intraspecific variability occurred as a consequence of fission/fusion-type chromosomal rearrangements in Ananteris and Tityus species and reciprocal translocation in Rhopalurus species. Furthermore, we verified that individuals presenting the same diploid number differ in structural chromosome organisation, giving rise to intraspecific differences of chromosome association in meiotic cells (bivalent-like elements or chromosome chains). © 2013 Springer Science+Business Media Dordrecht.
dc.languageeng
dc.relationChromosome Research
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectchromosome rearrangements
dc.subjectevolution
dc.subjectheterozygosity
dc.subjectholocentric
dc.subjectmeiosis
dc.subjectnucleolar organiser region
dc.subjectAnanteris
dc.subjectanimal cell
dc.subjectcell nucleus
dc.subjectcentromere
dc.subjectchromosome
dc.subjectchromosome NOR
dc.subjectchromosome number
dc.subjectcontrolled study
dc.subjectdiploidy
dc.subjectfemale
dc.subjectgenetic variability
dc.subjectheterochromatin
dc.subjectmale
dc.subjectmetaphase
dc.subjectnonhuman
dc.subjectpachytene
dc.subjectpostpachytene
dc.subjectpriority journal
dc.subjectreciprocal chromosome translocation
dc.subjectRhopalurus
dc.subjectscorpion
dc.subjectspecies diversity
dc.subjectTityus
dc.subjectButhida
dc.subjectButhidae
dc.subjectScorpiones
dc.titleHigh chromosome variability and the presence of multivalent associations in buthid scorpions
dc.typeOtro


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