Centromere localization at meiosis and the position of chiasmata in the male and female mouse

Polani, P. E.

doi:10.1007/bf00336793

Cited by 83 publications

(37 citation statements)

References 69 publications

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“…Differences in chiasma frequency and distribution are known to exist between the sexes in some eutherian mammals (Polani, 1972) and lower vertebrates (Callan and Perry, 1977). However, it would be remarkable if the situation in females of the species considered here was the reverse of that described in the males, so that the level of recombination of the species as a whole and their life history components were not correlated.…”

Section: The Recombination Datamentioning

confidence: 78%

An examination of the role of chiasma frequency in the genetic system of marsupials

Sharp

1988

Heredity

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Chiasma frequencies have been collected from males of 33 species of marsupial, varying widely with respect to size, reproduction and development. Correlation analyses show that species with lower levels of recombination are smaller, have larger litters and develop more quickly. Two indices of recombination level were considered: Darlington's Recombination Index, and the Excess Chiasma frequency (chiasmata above one per bivalent). The EC is in general more strongly correlated than RI with aspects of life history. It is suggested that EC levels have evolved due to the effects of EC on recombination, but that chromosome number has evolved independently.

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Section: The Recombination Datamentioning

confidence: 78%

An examination of the role of chiasma frequency in the genetic system of marsupials

Sharp

1988

Heredity

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confidence: 99%

C-banding Patterns in Somatic and Meiotic Chromosomes of Crepis capillaris

Tanaka

Komatsu

1977

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

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Much has been known about the C-banding patterns of somatic and meiotic chromosomes in both animals and plants (Polani 1972, Forej t 1973, Dret and Stoll 1974, Marks 1974, Schmid and Krone 1976 , but a question has remained as to whether, or not, the same patterns appear constantly at the particular region of the chromosomes in various types of somatic and meiotic cells. In many reported cases, some difficulties occur for the identification of meiotic chromosomes. The situation has led us to undertake a comparative study of the C-banding pattern in three different types of cells of Crepis capillaris, since the latter possesses a very low chromosome number (2n=6), and individual chromosomes are identifiable with easiness.Preparation. Crepis capillaris (2n=6) was supplied through the courtesy of Prof. Y. Shimizu, Tohoku University, to whom we are grateful.Root tip cells, young leaf cells of shoot apex and pollen mother cells (PMCs) of young flower bud provided materials for this study. According to Tanaka and Taniguchi (1975), the materials were treated as follows : root tips and young leaves were pretreated with 0.002 M-hydroxyquinoline at 18-20°C for 2.5 hr. Root tips were fixed with ethanol + acetic acid (3: 1) at 5°C for 24 hr. Young leaves were fixed with ethanol + acetic acid + chloroform (2: 1:1) . Both the root tips and young leaves were hydrolysed with 1N-HC1 + 45% acetic acid (2: 1) at 60°C for 15 sec. and rinsed in deionized water for 10-30 min. They were squashed in a drop of 45% acetic acid under the coverslip. Flower buds were fixed with ethanol + acetic acid + chloroform (2: 1:1) . PMCs were taken from the anther in fixed flower bud and squashed under the coverslip. After coverslips were removed with dry ice, the slides were air-dried for 12-24 hr., incubated in 5 % aqueous solution of barium hydroxide at 50°C for 5 min., and rinsed in deionized water for 10-20 min. They were incubated in 2 x SSC (0.3 M NaCI and 0.003 M C6H5Na307.2H2O in deionized water) at 60°C for 2 hr, and rinsed in deionized water for 10-30 min. They were stained with a buffered Giemsa solution (1.5%, Merk) at 18-20°C for 15 min. Finally the preparations were rinsed in deionized

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“…The reverse argument could be set out if the interference increase was a direct effect of the fusion; however, the fact that spontaneous, newly arisen centric fusions (i.e. without previous selective history) never attain the degree of various fusion metacentrics of Dichroplus pratensis described by Bidau (1984Bidau ( , 1990) -leads us to favour the hypothesis of i increasing as a result of adaptation to the polymorphic state (Southern, 1967b;Polani, 1972;Peters, 1982;Teoh & Young, 1983;Lopez Fernandez eta!., 1 984;Vilardi, 1 984;Colombo, 1987;Remis, 1990). Bidau (1990) argues that this body of evidence is insufficient, because these cases are 'a scanty amount indeed' of all fusions that occur spontaneously in (-3 + 6) 4 5 6 7 8 9 10 II 2 13 14 15 16 17 Chromosome (Or chromosome arm) length as a percentage of total autosomal length Fig.…”

Section: Interference Distancementioning

confidence: 94%

A polymorphic centric fusion enhances chiasma interference in Leptysma argentina (Orthoptera): a chiasma distribution study

Colombo

1993

Heredity

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A chiasma distribution study in diplotene in the grasshopper Leptysma argentina revealed that: (i) chiasma interference plays a central role in determining chiasma distribution in bivalents carrying two or more chiasmata in this species; (ii) the distance of interference (1) increases significantly in fusion carriers, and this effect is additive (is more pronounced in fusion homozygotes than in heterozygotes). This increase is due to a genuine intensification of chiasma interference; (iii) chiasma interference is operative across the centromere; and (iv) across-centromere interference is also influenced by the karyotype, in the same fashion as non trans-centromeric interference. Finally, a discussion concerning the possible origin of the fusion 3/6 polymorphism is held.

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Centromere localization at meiosis and the position of chiasmata in the male and female mouse

Cited by 83 publications

References 69 publications

An examination of the role of chiasma frequency in the genetic system of marsupials

An examination of the role of chiasma frequency in the genetic system of marsupials

C-banding Patterns in Somatic and Meiotic Chromosomes of Crepis capillaris

A polymorphic centric fusion enhances chiasma interference in Leptysma argentina (Orthoptera): a chiasma distribution study

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