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Myoclonic epilepsy and a maternally derived deletion of 15pter-->q13
M Mizuguchi1, K Tsukamoto, Y Suzuki
1Department of Pediatrics, Faculty of Medicine, University of Tokyo, Japan.
Clinical Genetics
|January 1, 1994
Insights
A maternal deletion on chromosome 15 caused developmental delays and early-onset myoclonic epilepsy in an infant. This genetic condition resulted from a specific translocation in the mother.
Area of Science:
- Genetics
- Developmental Neuroscience
- Clinical Pediatrics
Background:
- Chromosome 15 deletions are associated with various developmental disorders.
- Proximal 15q deletions present a spectrum of neurodevelopmental abnormalities.
Observation:
- A mentally retarded infant presented with symptoms of proximal 15q deletion.
- The infant's phenotype also included early-onset myoclonic epilepsy.
Findings:
- The infant's condition was linked to a deletion of the 15pter-->q13 segment inherited from the mother.
- The maternal 15pter-->q13 deletion arose from a 3:1 disjunction event.
- The mother was identified as a carrier of a t(15;22)(13q;p11) translocation.
Implications:
- This case highlights a specific chromosomal abnormality leading to a complex phenotype.
- Understanding such deletions aids in diagnosing and counseling families with genetic disorders.
- Early-onset myoclonic epilepsy can be a feature of specific 15q deletions.
Abstract:
Deletion of a 15pter-->q13 segment of maternal origin was observed in a mentally retarded infant. In addition to the symptoms common to deletions of proximal 15q, the phenotype included myoclonic epilepsy of early infantile onset. The deletion was caused by a 3:1 disjunction in the mother, who was a carrier of t(15;22)(13q;p11) translocation.