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. 1981 Mar;33(2):243–251.

Satellite DNA sequences in the human acrocentric chromosomes: information from translocations and heteromorphisms.

J R Gosden, S S Lawrie, C M Gosden
PMCID: PMC1684944  PMID: 6163355

Abstract

Satellite III DNA has been located by in situ hybridization in chromosomes 1, 3--5, 7, 9, 10, 13--18, 20--22, and Y and ribosomal DNA (rDNA) in the acrocentric chromosomes 13--15, 21, and 22. In the acrocentric chromosomes, the satellite DNA is located in the short arm. Here we report comparisons by in situ hybridization of the amount of satellite DNA in Robertsonian translocation and "normal variant" chromosomes with that in their homologs. In almost all dicentric Robertsonian translocations, the amount of satellite DNA is less than that in the normal homologs, but it is rarely completely absent, indicating that satellite DNA is located between the centromere and the nucleolus organizer region (NOR) and that the breakpoints are within the satellite DNA. The amount of satellite DNA shows a range of variation in "normal" chromosomes, and this is still more extreme in "normal variant" chromosomes, those with large short arm (p+ or ph+) generally having more satellite DNA than those with small short arms (p- or ph-). The cytological satellites are heterogeneous in DNA content; some contain satellite DNA, others apparently do not, and the satellite DNA content is not related to the size or intensity of fluorescence of the satellites. The significance of these variations for the putative functions of satellite DNA is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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