PMID: 6540161Jan 1, 1984Paper

The morphological sequence of XY pairing in the Norway rat Rattus norvegicus

Chromosoma
A M Joseph, A C Chandley

Abstract

The sequence of XY pairing at meiotic prophase in the Norway rat, Rattus norvegicus, has been studied in spread preparations of spermatocytes obtained from pubertal males. As in most mammals, sex chromosome pairing is delayed in relation to that of the autosomes. At one stage in pachytene, the Y is fully paired in synaptonemal complex association with about one-third of the X. Observation in spread preparations at pachytene and diplotene and in air-dried metaphase I preparations indicates that the long arm of the Y pairs with the short arm of the X. Pairing of the Y with both ends of the X is seen in about 4% of pachytene spermatocytes. The possibility that XY pairing in the rat may be nonhomologous (Ashley 1983) is considered, and the view is expressed that the XY synaptonemal complex may be incomplete in fine structural detail, thus not providing for the effective pairing required in true reciprocal recombination. The same mechanism that excludes crossing over from heterochromatic regions of autosomes may also operate to minimize or prevent crossing over in the sex pair of mammals.

References

Mar 21, 1977·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·M P Maguire
Mar 10, 1976·Chromosoma·B John
Jan 1, 1967·Annals of Human Genetics·H Grüneberg
Jan 1, 1983·Human Genetics·R JohannissonE Schwinger
Jan 1, 1984·Human Genetics·R M Speed
Apr 1, 1957·Experimental Cell Research·S OHNOR KINOSITA

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Citations

May 6, 2010·Chromosoma·Asato KuroiwaYoichi Matsuda
Apr 25, 2008·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Tsuyoshi KobayashiAsato Kuroiwa
Jun 1, 1991·Proceedings of the National Academy of Sciences of the United States of America·Y MatsudaV M Chapman
Jul 1, 1987·The Journal of Cell Biology·P B MoensQ Chen
Jul 10, 2009·Yi chuan = Hereditas·Nan YanYu-Feng Wang

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