Behavior of sex chromosomes during meiosis in the house shrew

Satya-Prakash, K. L.; Aswathanarayana, N. V.

doi:10.1093/oxfordjournals.jhered.a109894

Cited by 7 publications

(3 citation statements)

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“…1987) and Peromyscus (Hale and Greenbaum. 1986a;Sudman and Greenbaum, 1990; this study), analyses of diakinesis/metaphase I con figurations indicate that the heterochromatic segments of the musk shrew X and Y chromosomes are involved in pairing and chiasma formation (Satya-Prakash and Aswathanarayana. 1984;Raman and Nanda, 1986).…”

Section: Discussionmentioning

confidence: 58%

The effect of heterochromatin on synapsis of the sex chromosomes of <i>Peromyscus </i>(Rodentia, Cricetidae)

Hale

Hedin

Smith

et al. 1991

Cytogenet Genome Res

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The pairing behavior of the sex chromosomes in male and female individuals representing seven species of Peromyscus was analyzed by electron microscopy of silver-stained zygotene and pachytene configurations. Six species possess submetacentric or metacentric X chromosomes with heterochromatic short arms. Sex-chromosome pairing in these species is initiated during early pachynema at an interstitial position on the X and Y axes. Homologous synapsis then progresses in a unidirectional fashion towards the telomeres of the X short arm and the corresponding arm of the heterochromatic Y chromosome. The distinctive pattern of synaptic initiation allowed a late-synapsing bivalent in fetal oocytes to be tentatively identified as that of the X chromosomes. In contrast to the other species, Peromyscus megalops possesses an acrocentric X chromosome and a very small Y chromosome. Sex-chromosome pairing in this species is initiated at the proximal telomeric region during late zygonema, and then proceeds interstitially towards the distal end of the Y chromosome. These observations suggest that the presence of X short-arm heterochromatin and corresponding Y heterochromatin interferes with late-zygotene alignment of the pairing initiation sites, thereby delaying XY synaptic initiation until early pachynema. The pairing initiation sites are conserved in the vicinity of the X and Y centromeres in Peromyscus, and consequently the addition of heterochromatin during sex-chromosome evolution essentially displaces these sites to an interstitial position.

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Section: Discussionmentioning

confidence: 58%

The effect of heterochromatin on synapsis of the sex chromosomes of <i>Peromyscus </i>(Rodentia, Cricetidae)

Hale

Hedin

Smith

et al. 1991

Cytogenet Genome Res

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“…2 (HS 2), the interstitial region of the short arm of HS 4, and the short arms of HS 6, 7, 9 and 10. The X carried a large amount of C-heterochromatin (C-positive block) on the distal ends of its arms, as already noted by Ando et al (1980) and Satya-Prakash and Aswathanarayana (1984), and the Y carried large C-positive blocks on either side of its centromere which occupied almost half of its each arm. It was suggested, from the C-staining properties, that the Y of the house shrew may contain certain amount of euchromatin.…”

supporting

confidence: 59%

Karyological relationship between the Japanese house shrew, Suncus murinus riukiuanus and the Japanese white-toothed shrew, Crocidura dsinezumi chisai.

Tada

Obara

1986

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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“…Difference with former number is due to a Robertsonian fusion. Satya-Prakash & Aswathanarayana, 1984. Study on the behaviour of the sex chromosomes during meiosis.…”

Section: Genus Soriculus Blyth 1854mentioning

confidence: 99%

New developments in vertebrate cytotaxonomy IX Chromosome numbers in the order Insectivora (Mammalia)

Reumer¹,

Meylan²

1986

Genetica

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A reference list of chromosome numbers of about 110 species in the order Insectivora is presented. Cytotaxonomic data are known for six families: Solenodontidae, Tenrecidae (incl. Potamogalidae), Erinaceidae, Soricidae, Talpidae and Macroscelididae (only the Chrysochloridae remain unstudied). The list provides, wherever possible, the diploid chromosome number(s), Nombre Fondamental, and references; sometimes information on geography, synonymy, as well as short comments are added.

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Behavior of sex chromosomes during meiosis in the house shrew

Cited by 7 publications

References 0 publications

The effect of heterochromatin on synapsis of the sex chromosomes of <i>Peromyscus </i>(Rodentia, Cricetidae)

The effect of heterochromatin on synapsis of the sex chromosomes of <i>Peromyscus </i>(Rodentia, Cricetidae)

Karyological relationship between the Japanese house shrew, Suncus murinus riukiuanus and the Japanese white-toothed shrew, Crocidura dsinezumi chisai.

New developments in vertebrate cytotaxonomy IX Chromosome numbers in the order Insectivora (Mammalia)

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