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Molecular genetics of pseudoxanthoma elasticum
F Ringpfeil1, L Pulkkinen, J Uitto
1Department of Dermatology and Cutaneous Biology, Jefferson Medical College, Thomas Jefferson University, 233 S. 10th Street, Philadelphia, PA 19107, USA.
Experimental Dermatology
|August 9, 2001
Summary
Pseudoxanthoma elasticum (PXE) is a genetic disorder affecting connective tissues. Mutations in the ABCC6 gene cause PXE, impacting elastic fibers and suggesting a metabolic origin.
Area of Science:
- Genetics
- Connective Tissue Disorders
- Molecular Biology
Background:
- Pseudoxanthoma elasticum (PXE) is a heritable connective tissue disorder.
- PXE involves progressive calcification of elastic structures in skin, eyes, and the cardiovascular system.
- Significant variability in PXE presentation exists within and between families.
Purpose of the Study:
- To identify the genetic basis of Pseudoxanthoma elasticum (PXE).
- To understand the function and expression of the MRP6 protein.
- To establish genetic testing for PXE diagnosis and risk assessment.
Main Methods:
- Genetic analysis to identify mutations in the ABCC6 gene.
- Sequence analysis of the ABCC6 gene and MRP6 protein.
- Investigation of MRP6 protein expression patterns.
Main Results:
- Genetic defects in the ABCC6 gene are confirmed as the cause of PXE.
- PXE follows an autosomal recessive inheritance pattern with various mutations.
- MRP6 protein, encoded by ABCC6, is primarily expressed in the liver and kidneys.
Conclusions:
- PXE may originate as a metabolic disorder with secondary effects on elastic fibers.
- ABCC6 gene mutations provide a basis for prenatal and presymptomatic PXE testing.
- DNA analysis can identify carriers at risk for milder PXE manifestations.