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1 Journal of Applied Genetics

1 1995

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A survey of satelite association formation by human acrocentric chromosomes depending on their Ag-NOR class

100%

Trzepizur K. , Hubner H. , Trzepizur Z.

nr 1

69-80

The frequency of individual Ag-NOR classes acc.to classification of Spinner et al.in the chromosomes of 37 woman and 63 men and the frequency of satellite association (SA) formation by acrocentric chromosomes depending on Ag-NOR class were studied.Totally, 6686 satelite associations formed by 14730 acrocentric chromosomes and by 35270 acrocentric chromosomes beyond SA were surveyed.It was inferred that chromosomes 12 and 22, which are smaller than chromosomes 13-15, possess more extended nucleolus organizer regions.The frequency of Ag-NOR clesses in chromosomes is not depended on sex.It was found that acrocentric chromosomes with Ag-NOR classes I, II and III are more frequently encountered in SA, whereas those with Ag-NOR classes IV and V are more frequent in the metaphase plate beyond SA.Acrocentric chromosomes 21 and 22 with Ag-NOR classes I and II reside in SA equally frequently.Comparisons between chromosomes 21(22)-13, 21(22)-14 and 21(22)-15 show that chromosomes 21 and 22 more frequently enter into SA than chromosomes of group 13-15.No direct relations were found between the degree of NOR silver-staining of an acrocentric chromosome and a more frequent entry of this chromosome into SA or into a definite type of SA.