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Related Experiment Videos

Fragile site (16) (q22). III. Segregation analysis.

B Müller1, W Feichtinger, C Bonaïti-Pellié

  • 1Abteilung für pädiatrische Genetik und pränatale Diagnostik, Universität, München, Federal Republic of Germany.

Human Genetics
|August 1, 1992
PubMed
Summary

The fragile site fra (16) (q22) is the most common rare autosomal fragile site. While it shows complete penetrance, transmission is more likely from female parents, with no sex bias in offspring.

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Area of Science:

  • Human Genetics
  • Cytogenetics
  • Population Genetics

Background:

  • The fragile site fra (16) (q22) is the most frequent rare autosomal fragile site, with a heterozygote frequency of approximately 5%.
  • Autosomal fragile sites are chromosomal regions susceptible to breakage under specific laboratory conditions.
  • Understanding the inheritance patterns of fragile sites is crucial for genetic counseling and understanding chromosomal instability.

Purpose of the Study:

  • To investigate the inheritance pattern and penetrance of the rare autosomal fragile site, fra (16) (q22).
  • To determine if there is preferential transmission of fra (16) (q22) to offspring based on parental sex or offspring sex.

Main Methods:

  • Analysis of segregation patterns in 12 families with the fra (16) (q22) fragile site.

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  • Statistical evaluation to assess penetrance and parental transmission likelihood.
  • Comparison of transmission rates between male and female transmitting parents and between male and female offspring.

    • Main Results:

    • The inheritance of fra (16) (q22) is consistent with a simple codominant trait exhibiting complete penetrance.
    • Analysis of 12 families revealed a significantly higher likelihood of transmission from female parents compared to male parents.
    • No evidence of preferential transmission of the fragile site to offspring of either sex was observed.

    Conclusions:

    • The fragile site fra (16) (q22) follows a simple codominant inheritance pattern with complete penetrance.
    • Parental sex influences transmission, with a higher probability of transmission originating from the female parent.
    • The findings contribute to understanding the genetics of fragile sites and have implications for genetic counseling.