NDLI: Complex meiotic configuration of the holocentric chromosomes: the intriguing case of the scorpion Tityus bahiensis

Content Provider	Springer Nature Link
Author	Schneider, Marielle Cristina Zacaro, Adilson Ariza Pinto da Rocha, Ricardo Candido, Denise Maria Cella, Doralice Maria
Copyright Year	2009
Abstract	Mitotic and meiotic chromosomes of Tityus bahiensis were investigated using light (LM) and transmission electron microscopy (TEM) to determine the chromosomal characteristics and disclose the mechanisms responsible for intraspecific variability in chromosome number and for the presence of complex chromosome association during meiosis. This species is endemic to Brazilian fauna and belongs to the family Buthidae, which is considered phylogenetically basal within the order Scorpiones. In the sample examined, four sympatric and distinct diploid numbers were observed: 2n = 5, 2n = 6, 2n = 9, and 2 = 10. The origin of this remarkable chromosome variability was attributed to chromosome fissions and/or fusions, considering that the decrease in chromosome number was concomitant with the increase in chromosome size and vice versa. The LM and TEM analyses showed the presence of chromosomes without localised centromere, the lack of chiasmata and recombination nodules in male meiosis, and two nucleolar organiser regions carrier chromosomes. Furthermore, male prophase I cells revealed multivalent chromosome associations and/or unsynapsed or distinctly associated chromosome regions (gaps, less-condensed chromatin, or loop-like structure) that were continuous with synapsed chromosome segments. All these data permitted us to suggest that the chromosomal rearrangements of T. bahiensis occurred in a heterozygous state. A combination of various factors, such as correct disjunction and balanced segregation of the chromosomes involved in complex meiotic pairing, system of achiasmate meiosis, holocentric nature of the chromosomes, population structure, and species dispersion patterns, could have contributed to the high level of chromosome rearrangements present in T. bahiensis.
Starting Page	883
Ending Page	898
Page Count	16
File Format	PDF
ISSN	09673849
Journal	Chromosome Research
Volume Number	17
Issue Number	7
e-ISSN	15736849
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-09-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	achiasmate meiosis cytogenetic diploid number nucleolar material synaptonemal complex Plant Genetics & Genomics Animal Genetics and Genomics Human Genetics Cell Biology
Content Type	Text
Resource Type	Article
Subject	Genetics

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