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1

The frequency of satelite associations in parents of children with trisomy 21

100%
Ferenc T., Bratkowska W., Barczyk A., Kochanska H., Orlowska S., Byczkiewicz F.
Journal of Applied Genetics
|
1995
|
vol. 36
|
issue 1
81-88
EN
The paperr presents the frequency of satellite associations (SA) of acrocentric chromosomes in 11 mothers and 11 fathers of children with trisomy 21 with reference to meiotic and mitotic nondisjunction.The control group consisted of 60 individuals of the both sexes at the age of 20-45.Satelite associations were investigated in the metaphase plates obtained from the culture of peripheral blood lymphocytes.The association index values (AI) in six mothers and six fatheers exceeded the mean AI value plus 2 standard deviations noted for the control group of women and men.The mean AI values for chromosome 21 in the group of fathers and mothers of children with trisomy 21 were significantly higher in comparison to the control of man and women.Associations 13-21, 21-21, 21-22 in the fgroup of mothers and 13-21, 15-21, 21-21, 21-22 in the group of fathers were observed more frequently than in control group.Associations 13-13-21, 13-21-21, 13-21-2, 21-21-22 occured more frequently in the group of parents of children with trisomy 21 than in the control.
2

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

100%
Trzepizur K., Hubner H., Trzepizur Z.
Journal of Applied Genetics
|
1995
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vol. 36
|
issue 1
69-80
EN
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.
3

Satellite association frequency in persons with goiter

88%
Ferenc T., Bratkowska W., Maziarz Z., Gaszynska M.
Genetica Polonica
|
1994
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vol. 35
|
issue 4
333-344
EN
The work was carried out to estimate satellite association (SA) frequency of acrocentric chromosomes in male and female persons with goiter at a normal, increased and decreased concentrations of thyroid hormones with relation to meiotic or mitotic nondisjunction.Satelite associations were estimated on the methaphase plates obtained through macroculture of peripheral blood limphocytes.The concentration of triiodothyronine (T3) and thyroxine (T4) was determined by the method of radioimmunological analysis (RIA).
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