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Affected sibs with fragile X syndrome exhibit an age-dependent decrease in the size of the fragile X full mutation
Clinical Genetics
|March 1, 1993
Summary
The fragile X mutation size decreases with age in affected individuals. This suggests that cells with smaller mutations may be favored, potentially due to selection or maternal imprinting.
Area of Science:
- Genetics
- Molecular Biology
- Human Disease
Background:
- Fragile X syndrome is a genetic disorder.
- The fragile X mutation involves a CGG repeat expansion.
Purpose of the Study:
- To investigate the size of the fragile X mutation in individuals with fragile X syndrome.
- To explore potential age-dependent changes in mutation size.
Main Methods:
- Southern blot analysis was used to determine mutation sizes.
- The study analyzed 33 sibling pairs affected with fragile X syndrome.
Main Results:
- A decrease in fragile X mutation size was observed with increasing age.
- This age-dependent decrease was noted in blood cells.
Conclusions:
- The findings suggest positive selection of blood cells with smaller fragile X mutations during an individual's lifetime.
- Maternal imprinting may also play a role in the observed phenomenon.