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Aplasia cutis congenita in two sibs discordant for pyloric atresia
Insights
This study describes two siblings with aplasia cutis congenita (ACC). Researchers propose genetic linkage or varying disease severity to explain differences in congenital malformations between the siblings.
Area of Science:
- Genetics
- Dermatology
- Pediatrics
Background:
- Aplasia Cutis Congenita (ACC) is a rare congenital skin defect.
- Consanguineous mating increases the risk of autosomal recessive disorders.
- Understanding genetic mechanisms is crucial for diagnosing and managing rare diseases.
Observation:
- Two siblings from a consanguineous family presented with extensive Aplasia Cutis Congenita (ACC).
- One sibling exhibited severe skin fragility (epidermis and mucous membranes) and pyloric atresia with other congenital malformations.
- Significant discordance in phenotypic expression, beyond ACC, was observed between the siblings.
Findings:
- Two hypotheses were proposed: 1) varying severity of a single autosomal recessive ACC-related disease, or 2) genetic linkage between ACC and an epidermolysis bullosa (EB)-like disorder with pyloric atresia.
- A recombination event in a carrier parent could explain the offspring presenting solely with ACC.
- Monitoring alpha-fetoprotein levels in amniotic fluid is suggested for prenatal diagnosis.
Implications:
- This case highlights the complex genetic underpinnings of congenital disorders.
- Further research into genetic linkage can improve understanding of ACC and associated anomalies.
- Prenatal diagnosis strategies may aid in early detection and management of affected pregnancies.
Abstract:
We report two sibs who were the products of a consanguineous mating, and who had an extensive form of aplasia cutis congenita (ACC). In one of them the generalized skin disorder was manifested by slipping off of the epidermis and mucous membranes with the slightest trauma. This sib also had pyloric atresia and other congenital malformations. Two hypotheses are presented to explain the discordance between the siblings for the abnormalities other than the ACC. One hypothesis assumes varying degrees of severity of the same autosomal recessive disease. The second suggests linkage between the gene for ACC and the gene for an epidermolysis bullosa (EB)-like disorder and pyloric atresia. a recombination event involving the EB-pyloric atresia gene in one carrier parent would then lead to an offspring with only ACC. Prenatal diagnosis is suggested by monitoring alpha-fetoprotein levels in aminotic fluid.