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Isochromosome 20p associated with multiple congenital abnormalities
Alan E Fryer1, Michael Ashworth, Jed Hawe
1Departments of Clinical Genetics Pathology Radiology, Royal Liverpool Children's Hospital Department of Obstetrics, Countess of Chester Hospital Department of Cytogenetics, Liverpool Women's Hospital.
Clinical Dysmorphology
|December 17, 2004
Summary
Tetrasomy 20p, a rare genetic condition involving an extra isochromosome 20p, is described in a second case. This genetic abnormality led to fetal death and severe congenital anomalies, including poor bone ossification and fractures.
Area of Science:
- Genetics
- Developmental Biology
- Reproductive Medicine
Background:
- Tetrasomy 20p is a rare chromosomal abnormality characterized by the presence of four copies of the short arm of chromosome 20.
- Isochromosome formation, specifically an isochromosome 20p, is a mechanism leading to tetrasomy 20p.
Observation:
- This report details the second documented case of tetrasomy 20p.
- The affected fetus experienced spontaneous intrauterine death.
- Multiple congenital abnormalities were observed, consistent with previous findings.
Findings:
- The fetus exhibited severe skeletal malformations, including poor ossification of long bones.
- Multiple long bone fractures were present, indicative of compromised bone development.
- The genetic cause was identified as an additional isochromosome 20p.
Implications:
- This case reinforces the understanding of tetrasomy 20p's phenotypic spectrum and its association with severe developmental defects.
- It highlights the critical role of chromosomal integrity in normal fetal development.
- Further research into the mechanisms underlying tetrasomy 20p may inform genetic counseling and prenatal diagnostics.