Related Experiment Videos
Zimmer phocomelia: delineation by principal coordinate analysis
K Kosaki1, M C Jones, C Stayboldt
1Department of Pediatrics, University of California, San Diego, USA.
American Journal of Medical Genetics
|December 2, 1996
Summary
Zimmer phocomelia is a distinct congenital malformation syndrome characterized by limb, facial, and caudal defects. This case suggests an autosomal recessive inheritance pattern, challenging the "X-linked amelia" designation.
Area of Science:
- Medical Genetics
- Developmental Biology
- Clinical Dysmorphology
Background:
- Tetraphocomelia is a rare congenital anomaly characterized by severe shortening or absence of limbs.
- Previous descriptions suggested a potential X-linked inheritance pattern for certain phocomelic conditions.
Observation:
- A stillborn 46,XX fetus presented with tetraphocomelia, ear and nasal hypoplasia, cleft palate, pulmonary hypoplasia, imperforate anus/vagina, and ambiguous genitalia.
- The observed malformations closely resembled the condition described by Zimmer et al. in 1985.
Findings:
- The constellation of tetraphocomelia, craniofacial and caudal defects, and ambiguous genitalia defines a distinct malformation pattern termed Zimmer phocomelia.
- Statistical analysis supported the distinctness of Zimmer phocomelia from other phocomelic conditions.
- The presence of a female case with ambiguous genitalia and consanguinity in the original family suggests autosomal recessive inheritance, not X-linked.
Implications:
- Zimmer phocomelia should be recognized as a distinct syndrome with a likely autosomal recessive inheritance pattern.
- This finding necessitates re-evaluation of the current classification of Zimmer phocomelia, potentially renaming it from "X-linked amelia" to Zimmer phocomelia.
- Understanding the inheritance pattern is crucial for genetic counseling and diagnosis of affected families.