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Related Experiment Videos

Do numerical polymorphisms exist at the human 5 S locus?

A S Henderson, G Moskowitz, D Warburton

    Human Genetics
    |January 1, 1980
    PubMed
    Summary

    Numerical polymorphisms in human 5S ribosomal RNA (rRNA) genes were investigated. Two of seven individuals exhibited significant differences in 5S rRNA gene copy number on chromosome 1q homologs, indicating genetic variation.

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    Area of Science:

    • Human genetics
    • Molecular biology
    • Cytogenetics

    Background:

    • Ribosomal RNA (rRNA) genes are essential for protein synthesis.
    • The 5S rRNA gene locus is found on the short arm of human chromosome 1 (1p).
    • Genetic variations, or polymorphisms, can influence gene expression and cellular function.

    Purpose of the Study:

    • To investigate the presence of numerical polymorphisms in human 5S ribosomal RNA (rRNA) genes.
    • To determine if copy number variations exist at the 5S rRNA gene locus.
    • To assess the frequency of such polymorphisms in a small human cohort.

    Main Methods:

    • Hybridization in situ ( = a molecular cytogenetic technique used to detect and locate the presence or absence of specific DNA sequences on chromosomes)
    • Autoradiographic grain counting to quantify gene copy number.
    • Analysis of chromosome 1q homologs in seven individuals.

    Main Results:

    • Significant differences in autoradiographic grain counts were observed between homologous chromosome 1q tips in two out of seven individuals.
    • These differences suggest variations in the number of 5S rRNA gene copies.
    • The findings indicate the existence of numerical polymorphisms at this specific gene locus.

    Conclusions:

    • Numerical polymorphisms are present at the human 5S rRNA gene locus in some individuals.
    • This genetic variation may have implications for gene regulation and cellular processes.
    • Further research is warranted to explore the functional consequences of these polymorphisms.

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