Karyotype plasticity in crickets: Numerical, morphological, and nucleolar organizer region distribution pattern of Anurogryllus sp.

Karyotype plasticity in crickets: Numerical, morphological, and nucleolar organizer region distribution pattern of Anurogryllus sp.

Author Schneider, Marielle Cristina Autor UNIFESP Google Scholar
Zacaro, Adilson Ariza Google Scholar
Ferreira, Amilton Google Scholar
Cella, Doralice Maria Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de Viçosa (UFV)
Universidade de São Paulo (USP)
Abstract Within the Orthopteran species, those of the suborder Ensifera have been rarely studied from the cytogenetic point of view, mainly due to the difficulties for taxonomic identification of its species. The Gryllidae is the second largest family of this suborder and possesses some genera, such as Anurogryllus, that occur only on the American continents. The aim of this work was to determine the karyotype characteristics, the meiotic chromosome behaviour, and the nucleolar organizer region (NOR) pattern of Anurogryllus sp (Orthoptera: Gryllidae). In the analyzed sample, high levels of numerical, morphological, and NORs polymorphisms were detected. Within five distinct karyotypes that were found, the basic karyotype of Anurogryllus sp. showed 2n(male) = 22 + X0 with acrocentric autosomes and a metacentric X sex chromosome; furthermore, a conspicuous secondary constriction related to the NOR was present along the entire short arm on pair 5. The other four types of karyotypes arose from centric fusions between elements of pairs 1/3, 2/6, 4/7 and a NOR partial translocation from pair 5 onto the long arm terminal region of one element of the fused pair 2/6. Such intraspecific variability and the consequences of high levels of polymorphism are discussed, leading to conjectures about the mechanisms that led to these chromosome rearrangements.
Keywords centric fusion
cytogenetic
meiosis
secondary constriction
translocation
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Fundação para o Desenvolvimento da UNESP (FUNDUNESP)
Grant number FAPESP: 06/53275-3
Date 2010-07-02
Published in Journal Of Insect Science. Tucson: Univ Arizona, v. 10, n. 1 p.87, 2010.
ISSN 1536-2442 (Sherpa/Romeo, impact factor)
Publisher Univ Arizona
Extent 13
Origin http://dx.doi.org/10.1673/031.010.8701
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000279672400001
URI http://repositorio.unifesp.br/11600/44436

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