Support for random alignment of mitotic chromatids in associating nucleolus organizers.

Abstract:

:Peripheral blood cultures of five healthy chromosomally normal adults were used to study the lateral orientation of mitotic chromatids in satellite associations. Chromosomes were prepared after bromodeoxyuridine substitution for two S phases and the fluorescence-plus-Giemsa (FPG) technique. Conventionally stained preparations were used to assess the polymorphisms of the acrocentrics in each individual. Satellite association pairs in which the acrocentrics were involved in a close, relatively straight end-to-end configuration were analyzed in cells with differentially stained sister chromatids. The number of concordant (light-light) and discordant (light-dark) chromatid alignments in association varied from individual to individual. Chi square analysis revealed that four of the five subjects and the combined cell population from all subjects showed no deviation from the expected frequency of random alignment. The one subject with preferential nonrandom alignment had the widest range of polymorphisms and very long stalks involved in the majority of the associations, compared with the rest. We have obtained no evidence that as a general rule satellite associations are nonrandom with preferential orientation of dark-to-dark and light-to-light chromatids, although this may be the case in some individuals with very active NORs.

journal_name

Hum Genet

journal_title

Human genetics

authors

Woodruff KM,Martin-DeLeon PA

doi

10.1007/BF00291326

subject

Has Abstract

pub_date

1982-01-01 00:00:00

pages

27-30

issue

1

eissn

0340-6717

issn

1432-1203

journal_volume

61

pub_type

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