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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
REVIEW
Molecular genetics of pseudoxanthoma elasticum.
Experimental Dermatology 2001 August
Pseudoxanthoma elasticum (PXE), a systemic heritable connective tissue disorder, is characterized by progressive calcification of elastic structures in the skin, the eyes and the cardiovascular system, with considerable intra- and interfamilial phenotypic variability. Recently, underlying genetic defects have been identified in the ABCC6 gene, which resides on the chromosomal locus 16p13.1 and encodes the MRP6 protein, a member of the ATP-binding cassette (ABC) family of proteins. The affected individuals are homozygous or compound heterozygous for a spectrum of genetic lesions, including nonsense and missense mutations, or deletions and splice-site alterations, confirming the autosomal recessive nature of this condition. Analysis of the deduced primary sequence suggests that MRP6 is a transmembrane transporter, but its function has not been delineated yet. Surprisingly, however, MRP6 is expressed primarily, if not exclusively, in the liver and the kidneys, suggesting that PXE may be a primary metabolic disorder with secondary involvement of elastic fibers. Identification of mutations in the ABCC6 gene in PXE provides a means for prenatal and presymptomatic testing in families at risk for recurrence. DNA-based analyses will also identify heterozygous carriers who may be at risk for development of limited manifestations of the disease as a result of compounding genetic factors and/or environmental modifiers.
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