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Partial trisomy 4p resulting from a balanced intrachromosomal insertion, 4(q313p14p16)
1Department of Genetics & Biometry, Galton Laboratories, University College, London, U.K.
Insights
Partial trisomy 4p, a genetic condition causing developmental abnormalities, was identified in a child. This resulted from a maternal chromosomal insertion and subsequent recombination event during meiosis, leading to trisomy for specific 4p segments.
Area of Science:
- Genetics
- Human Cytogenetics
- Pediatric Genetics
Background:
- Partial trisomy 4p is a rare chromosomal abnormality.
- It is associated with characteristic dysmorphic features and developmental delays.
- Understanding the parental origin and mechanism of trisomy is crucial for genetic counseling.
Observation:
- A child presented with dysmorphic features suggestive of a chromosomal abnormality.
- Cytogenetic analysis of the parents revealed an intrachromosomal insertion in the mother's chromosome 4 (46,XX,ins(4)(q313p14p16)).
Findings:
- The child was diagnosed with partial trisomy 4p, specifically trisomic for the 4p(p14p16) region.
- This trisomy arose from a meiotic recombination event involving the mother's inserted chromosome 4.
- The study correlates the child's clinical presentation with known features of partial trisomy 4p.
Implications:
- This case highlights the role of parental chromosomal rearrangements in generating partial trisomies.
- It underscores the importance of detailed cytogenetic analysis in families with unexplained dysmorphic features.
- Findings contribute to the understanding of 4p duplication syndromes and their inheritance patterns.
Abstract:
Partial trisomy 4p was found in a child with dysmorphic features. Cytogenetic investigations in the parents revealed an intrachromosomal insertion in the mother, 46,XX,ins (4) (q313p14p16). The proband was trisomic for 4p(p14p16) as a result of a recombination event in the mother's chromosome 4 at meiosis. The clinical features of the proband are compared with those found in the literature.