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A mild phenotype associated with der(9)t(3;9) (p25;p23)
R J McClure1, N Telford, S J Newell
1Department of Paediatrics and Child Health, St James's University Hospital, Leeds, UK.
Journal of Medical Genetics
|July 1, 1996
Summary
This study details a rare chromosomal rearrangement, a derivative chromosome 9, in a female infant. The infant presented with milder symptoms than expected, suggesting a potential overgrowth syndrome.
Area of Science:
- Genetics
- Pediatrics
- Developmental Biology
Background:
- This study investigates a rare chromosomal rearrangement, specifically a derivative chromosome 9, inherited from a maternal translocation t(3;9)(p25;p23).
- The case involves a female infant exhibiting features overlapping with both dup(3p) and del(9p) syndromes.
Observation:
- The infant presented with hypoglycemia, hypotonia, central obesity (trunk and thighs), and mild dysmorphic features.
- Growth parameters were consistently above the 90th percentile, indicating significant overgrowth.
Findings:
- Chromosome analysis revealed a complex rearrangement involving adjacent I segregation of the maternal t(3;9)(p25;p23).
- The observed clinical features were milder than anticipated given the chromosomal imbalance, a deviation from typical presentations of dup(3p) or del(9p) syndromes.
Implications:
- This case highlights the variable expressivity of chromosomal rearrangements and suggests a potential overgrowth syndrome associated with this specific genetic imbalance.
- Further research into this rare rearrangement is warranted to understand its full spectrum of clinical manifestations, especially concerning potential sex reversal in males.