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Absence of satellite DNA synthesis during meiotic prophase in mouse and human spermatocytes

โœ Scribed by Yasuo Hotta; Herbert Stern

Publisher
Springer
Year
1978
Tongue
English
Weight
501 KB
Volume
69
Category
Article
ISSN
0009-5915

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โœฆ Synopsis

Mouse spermatocytes were labelled in situ with 3H-thymidine at successive stages of meiosis. Isolated mouse as well as human spermatocytes were similarly labelled under in vitro conditions. DNA synthesis was followed either by tracking radioactivities in Cs2SO4 gradients or by measuring reassociation kinetics. Mouse satellite DNA and the 3 satellites of human DNA are labelled during S-phase but not during pachytene. In the mouse genome, there is a preferential labelling of regions containing foldbacks (human spermatocytes were not analyzed in this respect). The absence of detectable pachytene synthesis in satellite DNA is consistent with genetic evidence on the absence of crossing-over in constitutive heterochromatin.

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