Abstract
The cloned alpha-satellite DNA sequences were used to evaluate the specificity and possible variability of repetitive DNA in constitutive heterochromatin of human chromosomes. Five probes with high specificity to individual chromosomes (chromosomes 3, 11, 17, 18, and X) were in situ hybridized to metaphase chromosomes of different individuals. The stable position of alpha-satellite DNA sequences in heterochromatic regions of particular chromosomes was found. Therefore, the chromosome-specific alpha-satellite DNA sequences may be used as molecular markers for heterochromatic regions of certain human chromosomes. The homologous chromosomes of many individuals were characterized by cytologically visible heteromorphisms of hybridization intensity with chromosome-specific alpha-satellite DNA sequences. A special analysis of hybridization between homologues with morphological differences provided the evidence for a high resolution power of the in situ hybridization technique for evaluation of chromosome heteromorphisms. The approaches for detection of heteromorphisms in cases without morphological differences between homologues are discussed. The results obtained indicate that constitutive heterochromatin of human chromosomes has a variable amount of alpha-satellite DNA sequences. In situ hybridization of cloned satellite DNA sequences may be used as a new general approach to analysis of chromosome heteromorphisms in man.
MeSH Terms
Base Sequence
Chromosome Mapping
Chromosomes, Human, Pair 11
Chromosomes, Human, Pair 17
Chromosomes, Human, Pair 18
Chromosomes, Human, Pair 3
Cloning, Molecular
DNA, Satellite/genetics
Genetic Markers
Heterochromatin/genetics
Humans
Karyotyping
Nucleic Acid Hybridization
Polymorphism, Genetic
X Chromosome
Chemicals
DNA, Satellite
Genetic Markers
Heterochromatin
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Yurov Y B
Mitkevich S P
Alexandrov I A
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