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Unbalanced 4;6 translocation and progressive renal disease
M E Pierpont1, A S Hentges, L J Gears
1Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota 55455, USA. pierp001@tc.umn.edu
American Journal of Medical Genetics
|December 5, 2000
Summary
This study describes two siblings with a 4;6 translocation, leading to partial trisomy 6p and distal 4p monosomy. Progressive kidney disease was observed in both children, highlighting its significance in this genetic condition.
Area of Science:
- Genetics
- Pediatrics
- Nephrology
Background:
- A rare unbalanced translocation between chromosomes 4 and 6 was identified in two siblings.
- This genetic abnormality results in partial trisomy of the 6p region and monosomy for the distal 4p region.
Observation:
- Both siblings exhibited growth and psychomotor retardation.
- Characteristic facial anomalies were noted, including a prominent forehead, ptosis, blepharophimosis, a high nasal bridge, bulbous nose, long philtrum, small mouth with thin lips, and low-set ears.
- Renal abnormalities, including small kidneys and proteinuria, were present from early childhood.
Findings:
- The older sibling developed progressive renal disease, hypertension, and end-stage renal failure requiring transplantation.
- Renal biopsy in the younger sibling confirmed significant renal involvement, suggesting a consistent pattern of kidney disease.
Implications:
- Partial trisomy 6p, in conjunction with 4p monosomy, is associated with significant developmental delays and distinct facial features.
- Progressive renal disease appears to be a critical and potentially severe component of the trisomy 6p phenotype, impacting long-term health outcomes.