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Chromosome Res
2009 Jan 01;177:883-98. doi: 10.1007/s10577-009-9076-4.
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Complex meiotic configuration of the holocentric chromosomes: the intriguing case of the scorpion Tityus bahiensis.
Schneider MC
,
Zacaro AA
,
Pinto-da-Rocha R
,
Candido DM
,
Cella DM
.
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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.
Altiero,
First evidence of achiasmatic male meiosis in the water bears Richtersius coronifer and Macrobiotus richtersi (Eutardigrada, Macrobiotidae).
2003, Pubmed
Altiero,
First evidence of achiasmatic male meiosis in the water bears Richtersius coronifer and Macrobiotus richtersi (Eutardigrada, Macrobiotidae).
2003,
Pubmed
DE PIZA,
[Ouro Preto, new and interesting chromosomal race of Tityus bahienis (Scorpiones-Buthidae)].
1949,
Pubmed
Dernburg,
Here, there, and everywhere: kinetochore function on holocentric chromosomes.
2001,
Pubmed
Fan,
New telomere formation coupled with site-specific chromosome breakage in Tetrahymena thermophila.
1996,
Pubmed
Forejt,
XY pair associates with the synaptonemal complex of autosomal male-sterile translocations in pachytene spermatocytes of the mouse (Mus musculus).
1981,
Pubmed
Howell,
Controlled silver-staining of nucleolus organizer regions with a protective colloidal developer: a 1-step method.
1980,
Pubmed
Ituarte,
Achiasmatic male meiosis in Tenagobia (Fuscagobia) fuscata (Stål) (Heteroptera, Corixoidea, Micronectidae).
2004,
Pubmed
Kingswood,
Meiosis in chromosomally heteromorphic goitered gazelle, Gazella subgutturosa (Artiodactyla, Bovidae).
1994,
Pubmed
Kodama,
An improved silver staining technique for nucleolus organizer regions by using nylon cloth.
1980,
Pubmed
Král,
Evolution of the karyotype and sex chromosome systems in basal clades of araneomorph spiders (Araneae: Araneomorphae).
2006,
Pubmed
Lawrence,
The Orientation of Multiple Associations Resulting from Interchange Heterozygosity.
1963,
Pubmed
Moore,
Are rice chromosomes components of a holocentric chromosome ancestor?
1997,
Pubmed
Nagaki,
Visualization of diffuse centromeres with centromere-specific histone H3 in the holocentric plant Luzula nivea.
2005,
Pubmed
Procunier,
A cytological study of two closely related blackfly species: Cnephia dacotensis and Cnephia ornithophilia (Diptera: Simuliidae).
1975,
Pubmed
Rasmussen,
Meiosis in Bombyx mori females.
1977,
Pubmed
Reed,
Synapsis, recombination, and meiotic segregation in the mesquite lizard, Sceloporus grammicus, complex. I. Pericentric inversion heteromorphism of the F5 cytotype.
1992,
Pubmed
Schneider,
A comparative cytogenetic analysis of 2 Bothriuridae species and overview of the chromosome data of Scorpiones.
2009,
Pubmed
Slijepcevic,
Instability of CHO chromosomes containing interstitial telomeric sequences originating from Chinese hamster chromosome 10.
1997,
Pubmed
Solari,
Synaptonemal complex karyotyping in Melanoplus differentialis.
1977,
Pubmed
Stahlavsky,
Karyotype analysis and achiasmatic meiosis in pseudoscorpions of the family Chthoniidae (Arachnida: Pseudoscorpiones).
2004,
Pubmed
Sumner,
A simple technique for demonstrating centromeric heterochromatin.
1972,
Pubmed
Takahashi,
Cytogenetical studies on the effects of high natural radiation levels in Tityus bahiensis (Scorpiones, Buthidae) from Morro do Ferro, Brazil.
1976,
Pubmed
Vítková,
The evolutionary origin of insect telomeric repeats, (TTAGG)n.
2005,
Pubmed
da Silva,
Chromosome reduction in Eleocharis maculosa (Cyperaceae).
2008,
Pubmed