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Autosomal recessive microcephaly and micromelia in Cree Indians
American Journal of Medical Genetics
|January 1, 1980
Summary
A rare genetic syndrome causing severe limb malformations, microcephaly, and growth retardation in newborns has been identified. Autosomal recessive inheritance is strongly suggested by the pattern observed in a Canadian Cree community.
Area of Science:
- Medical Genetics
- Clinical Dysmorphology
- Pediatric Medicine
Background:
- A unique congenital disorder was observed in a highly consanguineous Cree Indian population in northern Saskatchewan, Canada.
- Since 1953, 14 infants with similar malformations have been born to eight different mothers, prompting further investigation.
Observation:
- Six affected infants were studied to delineate the clinical features of the syndrome.
- Key manifestations include intrauterine growth retardation, perinatal death, severe microcephaly, and significant limb abnormalities, particularly affecting the arms.
Findings:
- Limb malformations involve fused elbows, shortened forearms with a single bone, and abnormal hands with two to four digits.
- The observed 25% segregation ratio, parental consanguinity, and near 1:1 sex ratio strongly support an autosomal recessive inheritance pattern.
Implications:
- This study aids in the delineation of a specific genetic syndrome with severe congenital anomalies.
- Understanding the autosomal recessive inheritance pattern is crucial for genetic counseling and potential future research in affected families.