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Pseudotrisomy 13 syndrome in siblings.
1Victorian Clinical Genetics Service, Royal Children's Hospital, Parkville, Australia. amord@cryptic.rch.unimelb.edu.au
Clinical Dysmorphology
|May 29, 2000
Summary
Pseudotrisomy 13 syndrome, a rare genetic disorder, was observed in siblings with holoprosencephaly and polydactyly. This case suggests an autosomal recessive inheritance pattern for this condition.
Area of Science:
- Genetics
- Developmental Biology
- Medical Genetics
Background:
- Holoprosencephaly (HPE) is a congenital disorder characterized by incomplete separation of the forebrain.
- Polydactyly is a condition characterized by the presence of more than the normal number of fingers or toes.
- Cardiac lesions are abnormalities in the heart's structure.
Observation:
- A brother and sister presented with a combination of holoprosencephaly, polydactyly, and cardiac lesions.
- Both affected siblings had a normal karyotype, ruling out chromosomal abnormalities like Trisomy 13.
- The parents were identified as first cousins, suggesting a potential genetic link.
Findings:
- The clinical presentation and family history are consistent with pseudotrisomy 13 syndrome.
- The occurrence in siblings from consanguineous parents supports an autosomal recessive mode of inheritance.
- This case adds to the evidence for the genetic basis of pseudotrisomy 13 syndrome.
Implications:
- Further research into the specific genes responsible for pseudotrisomy 13 syndrome is warranted.
- Genetic counseling for families with a history of consanguinity and these specific malformations is crucial.
- Understanding the inheritance pattern aids in accurate diagnosis and risk assessment for future offspring.