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[Menkes syndrome. An unusual pigmentation anomaly in a mother and three sisters]
Abstract:
Menkès syndrome is a sex-linked recessive disease. The authors previously reported a case in a boy whose neurologic condition deteriorated gradually until death occurred at the age of seven and a half months. Diagnosis was confirmed by the finding of very low plasma levels of copper and ceruloplasmin. Evaluation of family members disclosed hypopigmentation of one half of the abdomen in three sisters and in the carrier mother. This hypopigmentation may be ascribed to decreased melanocyte copper-dependant tyrosinase activity. Among cells in the body, this anomaly may be present or absent according to whether or not the abnormal X chromosome is inactivated.
Insights
Menkès syndrome, a genetic disorder, causes severe neurological issues and low copper levels. Affected females may show skin hypopigmentation due to altered tyrosinase activity.
Area of Science:
- Genetics
- Biochemistry
- Pediatrics
Background:
- Menkès syndrome is a rare, X-linked recessive disorder characterized by copper transport defects.
- Previous reports detailed a severe case in an infant boy with progressive neurological deterioration.
Observation:
- Family evaluation revealed abdominal hypopigmentation in female carriers.
- This skin finding suggests a potential phenotypic manifestation in carriers.
Findings:
- Diagnosis in the proband was confirmed by extremely low plasma copper and ceruloplasmin levels.
- Hypopigmentation in family members is linked to decreased copper-dependent tyrosinase activity in melanocytes.
Implications:
- The findings highlight the variable expressivity of Menkès syndrome, including potential skin manifestations in carriers.
- Understanding these varied presentations is crucial for accurate genetic counseling and carrier diagnosis.