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Paracentric inversion of chromosome 19 in three generations
M C Phelan1, R J Schroer, E F Krug
1Greenwood Genetic Center, SC 29646.
American Journal of Medical Genetics
|December 1, 1989
Summary
A paracentric inversion on chromosome 19p was identified in a boy with developmental delay. This genetic finding was also present in his healthy mother and grandfather, suggesting it may not cause developmental issues.
Area of Science:
- Genetics
- Developmental Pediatrics
- Human Chromosome Research
Background:
- Genetic inversions, particularly paracentric inversions, are chromosomal rearrangements that can impact gene function and organismal development.
- Understanding the phenotypic consequences of specific chromosomal abnormalities like 19p inversions is crucial for genetic counseling and diagnosis.
Observation:
- A 15-month-old white male presented with developmental delay and subtle facial anomalies.
- Cytogenetic analysis revealed a paracentric inversion involving chromosome 19p in the affected child.
Findings:
- The identified paracentric inversion of 19p was also detected in the child's mother and maternal grandfather, both of whom exhibit normal phenotypes.
- This familial occurrence indicates that the specific 19p paracentric inversion observed may be a benign variant in these individuals.
Implications:
- The findings suggest that paracentric inversions of 19p may not always be associated with adverse developmental outcomes or dysmorphic features.
- Further research is warranted to delineate the specific breakpoints and gene content within this inversion to fully understand its potential impact on phenotype.
- This case highlights the importance of family studies in interpreting the clinical significance of chromosomal rearrangements.