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Related Experiment Videos

Ring chromosome 6: case report and review

Y Nishi, O Yoshimura, K Ohama

    American Journal of Medical Genetics
    |May 1, 1982
    PubMed
    Summary

    A rare ring chromosome 6 (r(6)) was found in a healthy girl with short stature and microcephaly. This genetic finding, ring chromosome 6, highlights variable clinical presentations.

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    Area of Science:

    • Genetics
    • Human Cytogenetics

    Background:

    • Ring chromosome 6 (r(6)) is a rare chromosomal abnormality.
    • Previous reports associate r(6) with developmental delays and specific physical abnormalities.

    Observation:

    • A case of a healthy young female presenting with short stature and microcephaly is described.
    • Analysis revealed a high percentage of cells with a monocentric ring chromosome 6, alongside dicentric, tricentric, and two-ring formations.
    • Potential mosaicism (46,XX,r(6)/45,XX,-6) was also suggested.

    Findings:

    • The patient exhibited short stature and microcephaly without the typically associated intellectual disability or sensory impairments.
    • Cytogenetic analysis identified breakpoints on chromosome 6 at bands p24/p25 and q26/q27.
    • The observed r(6) involved a significant portion of the chromosome, replacing the normal chromosome 6 in most analyzed cells.

    Implications:

    • This case expands the known phenotypic spectrum of ring chromosome 6.
    • It underscores the importance of cytogenetic analysis in identifying chromosomal abnormalities even in seemingly healthy individuals with subtle growth or developmental variations.
    • Further research is needed to understand the long-term prognosis and potential risks associated with this specific r(6) variant.

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