Added Heterochromatin Segments in Chromosomes of Squirrel Monkeys (&lt;i&gt;Saimiri sciuveu&lt;/i&gt;&lt;i&gt;s&lt;/i&gt;)

S.F., Nancy; Jones, T. C.

doi:10.1159/000155698

Cited by 21 publications

(11 citation statements)

References 14 publications

(18 reference statements)

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“…Among Platyrrhini species, quantitative and qualitative modifications of heterochromatin can be illustrated with genera like Ateles (Nieves et al 2005a) and Saimiri (Ma and Jones 1975). A particular case is Cebus, which presents heteromorphisms of heterochromatic blocks throughout populations (Dutrillaux et al 1978;Seuánez et al 1986;Mudry de Pargament and Labal de Vinuesa 1988;Ponsà et al 1995;Martinez et al 2004;Nieves et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the heterochromatin of Cebus (Primates, Platyrrhini) by micro-FISH and banding pattern comparisons

Nieves

Oliveira²,

Amaral³

et al. 2011

J Genet

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The karyotype of the neotropical primate genus Cebus (Platyrrhini: Cebidae), considered the most ancestral one, shows the greatest amount of heterochromatin described among Platyrrhini genera. Banding techniques and restriction enzyme digestion have previously revealed great variability of quantity and composition of heterochromatin in this genus. In this context, we use fluorescence in situ hybridization (FISH) to analyse this genomic region and discuss its possible role in the diversification of Cebus.We used a heterochromatin probe for chromosome 11 of Cebus libidinosus (11qHe+ CLI probe), obtained by chromosome microdissection. Twenty-six specimens belonging to the families Atelidae, Cebidae, Callitrichidae and Pithecidae (Platyrrhini) were studied. Fourteen out of 26 specimens were Cebus (Cebidae) individuals of C. libidinosus, C. xanthosternos, C. apella, C. nigritus, C. albifrons, C. kaapori and C. olivaceus. In Cebus specimens, we found 6 to 22 positive signals located in interstitial and telomeric positions along the different species. No hybridization signal was observed among the remaining Ceboidea species, thus reinforcing the idea of a Cebus-specific heterochromatin composed of a complex system of repetitive sequences.

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Section: Introductionmentioning

confidence: 99%

Analysis of the heterochromatin of Cebus (Primates, Platyrrhini) by micro-FISH and banding pattern comparisons

Nieves

Oliveira²,

Amaral³

et al. 2011

J Genet

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“…The C positive heterochromatic bands are usually G positive. So far, the presence of different amounts of heterochromatin has been described in homo zygosis and/or heterozygosis for pairs A5, B5 and B12 [Ma and Jones, 1975;Lau and Arrighi, 1976].…”

Section: Discussionmentioning

confidence: 99%

“…C-banding studies carried out by Ma and Jones [1975] and by Lau et al [1977] have revealed a second type of intraspecific chromosomal polymorphism due to the presence of different amounts of constitutive heterochromatin in the short arms of pairs B5 and B12. Ma et al [1974] and Lau and Arrighi [1976] have also studied one animal each with a heterozygous pair made of one nonacrocentric and one acrocentric chromosomes.…”

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confidence: 99%

Chromosomal Polymorphism and Somatic Segregation in Saimiri sciureus

Garcı́a¹,

Miró²,

Ponsà³

et al. 1979

IJFP

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Quinacrine (Q) and Giemsa (G) banding, and sister chromatid exchange (SCE) studies have been carried out in Saimiri sciureus. In one male and one female studied, the diploid number was 2n = 44 and the karyotype corresponded to that described for the geographical region of Georgetown, Guyana. In the second male three different cell lines were observed, one corresponding to the geographical region of Leticia (Colombia), another to the geographical location of Iquitos (Peru) and a third line with 46 chromosomes. In the three lines, pair A2 was heterozygous, with nucleolar organizers of different size, and pair B6 was also heterozygous, with different amounts of heterochromatin in the short arms. The presence of three different cell lines in this male may be due to a mechanism of somatic segregation. The chromosomal changes involved in the intraspecific polymorphism found in Saimiri have been reinterpreted.

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“…The mitotic chromosomes of primates, among them the genus Saimiri, have been widely investigated. The diploid number for all Saimiri species is 44 chromosomes (2N 5 44, XX/XY) with differences in their karyotypes due to pericentric inversions [Ma & Jones, 1975]. The acrocentrics/non-acrocentrics ratio allows a clear identification of full species and hybrids both in captivity and the wild [Moore et al, 1990].…”

Section: Introductionmentioning

confidence: 99%

Meiotic characterization and sex determination system of neotropical primates: bolivian squirrel monkey Saimiri boliviensis (primates: cebidae)

Steinberg

Nieves

Mudry

2007

American J Primatol

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The chromosomal sex determination system differs among platyrrhine monkeys more than any other group of primates. Although a number of studies have investigated mitotic chromosomes across platyrrhine species, the meiotic chromosomes of many genera have not yet been described. The goal of this study was to characterize the sex determination system of Saimiri boliviensis. We described for the first time the meiotic cycle, confirming the sexual system in germ cells from testicular biopsies of four adult male S. boliviensis. All specimens were weighed and testicular volume was measured. We observed 22 bivalents corresponding to 2N = 44, and a "human-like" XY bivalent was found in diakinesis/metaphase I. In addition, mitotic studies from blood samples of both sexes were performed and G- and C-banding patterns agreed with previously reported karylogy of S. boliviensis boliviensis. Further meiotic studies should be performed in New World primates based on the great value of those studies for systematic evolutionary biology and conservation programs.

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Added Heterochromatin Segments in Chromosomes of Squirrel Monkeys (<i>Saimiri sciuveu</i><i>s</i>)

Cited by 21 publications

References 14 publications

Analysis of the heterochromatin of Cebus (Primates, Platyrrhini) by micro-FISH and banding pattern comparisons

Analysis of the heterochromatin of Cebus (Primates, Platyrrhini) by micro-FISH and banding pattern comparisons

Chromosomal Polymorphism and Somatic Segregation in Saimiri sciureus

Meiotic characterization and sex determination system of neotropical primates: bolivian squirrel monkey Saimiri boliviensis (primates: cebidae)

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