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centromere gap

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Correlation between centromere and chromosome length in human male pronuclear chromosomes: ultrastructural analysis
M. Rosa Martorell, Jordi Benet, Carmen Márquez, Josep Egozcue, Joaquima Navarro
Journal:

Zygote / Volume 8 / Issue 1 / February 2000

Published online by Cambridge University Press:

01 February 2000, pp. 79-85
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Ultrastructural and morphometric analyses of centromeric regions by scanning and transmission electron microscopy have been performed in chromosomes from male pronuclei obtained by heterologous fertilisation of hamster oocytes with human spermatozoa. In 1308 of 1323 chromosomes analysed, the primary constriction showed a defined biconcave constriction of variable length (0.56–1.34 μm) and constant width (0.64–0.7 μm). A positive correlation was observed between centromeric length and chromosome length. In some chromosomes, the primary constriction appears as decondensed regions of variable length (1.6–2.51 μm) composed of chromatin fibres with a minimum diameter of 30 nm.