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Fragile X-linked mental retardation: the Martin-Bell syndrome
Journal of Mental Deficiency Research
|December 1, 1981
Summary
Researchers re-examined a family with sex-linked mental retardation, finding five members carried a fragile X chromosome. This genetic anomaly is linked to specific physical traits and may be designated the Martin-Bell syndrome.
Area of Science:
- Genetics
- Medical Science
- Human Biology
Background:
- The Martin-Bell syndrome, a form of X-linked intellectual disability, was initially described in 1943.
- Previous studies identified a family with a hereditary pattern of intellectual disability linked to the X chromosome.
Observation:
- Seven family members from the original cohort were re-evaluated.
- Physical examinations were conducted to identify characteristic features associated with the condition.
Findings:
- Five of the seven re-examined individuals were found to carry a fragile X chromosome.
- Some affected individuals exhibited the characteristic facial features associated with fragile X syndrome.
- Macro-orchidism was observed in some members of the family.
Implications:
- This study provides genetic confirmation for the Martin-Bell syndrome.
- Identifying the fragile X chromosome as the causative factor aids in understanding the inheritance and pathology.
- The findings support the designation of the condition as the Martin-Bell syndrome, facilitating future research and clinical diagnosis.