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Monosomy 1p36--a recently delineated, clinically recognizable syndrome.
M Zenker1, O Rittinger, K P Grosse
1Institut für Humangenetik der Universität Erlangen-Nürnberg, Germany. martin.zenker@kinder.imed.uni-erlangen.de
Clinical Dysmorphology
|February 2, 2002
Summary
Monosomy 1p36, a common microdeletion syndrome, causes severe developmental delays. Distinct facial features can help diagnose it when routine karyotyping fails.
Area of Science:
- Genetics
- Developmental Biology
- Clinical Medicine
Background:
- Monosomy 1p36 is a contiguous gene syndrome and a frequent subtelomeric microdeletion.
- It is increasingly recognized as a significant cause of developmental abnormalities.
Observation:
- Four unrelated patients with 1p36 deletions were identified via high-resolution karyotyping and FISH.
- All patients presented with severe psychomotor retardation; three had microcephaly, seizures, and visual impairment.
Findings:
- Routine karyotyping was inconclusive in three of the four patients.
- Clinical recognition, often guided by characteristic facial anomalies, was key to diagnosis in most cases.
Implications:
- This highlights the clinical utility of recognizing specific dysmorphic features for diagnosing 1p36 deletions.
- Early clinical suspicion is crucial, as subtle deletions may be missed by standard cytogenetic analysis.