title: New ABCC6 gene mutations in German pseudoxanthoma elasticum patients.
abstract: Pseudoxanthoma elasticum (PXE; OMIM 177850 and 264800) is a rare heritable disorder of the connective tissue affecting the extracellular matrix of the skin, eyes, gastrointestinal system, and cardiovascular system. It has recently been found that mutations in the ABCC6 gene encoding the multidrug resistance-associated protein (MRP) 6 cause PXE. This study examined novel mutations in the ABCC6 gene in our cohort of 76 German PXE patients and 54 unaffected or not yet affected relatives with a view to expanding the known mutational spectrum of the gene. Mutational analysis was performed using denaturing high-performance liquid chromatography and direct sequencing. The mutational screening revealed a total of 22 different ABCC6 sequence variations. We identified seven novel and four previously described PXE-associated mutations as well as eight novel neutral ABCC6 sequence variants. The new PXE-associated mutations included five missense mutations, one single base pair deletion, and one larger out-of-frame deletion. We suspect that the novel missense mutations lead to an impaired function of MRP6. Both deletions are predicted to result in a dysfunctional MRP6 protein. The seven new ABCC6 mutations were not present in 200 alleles from healthy blood donors which served as a control cohort. Most of the PXE patients who were found to carry PXE-causing ABCC6 mutations were assumed to manifest the PXE phenotype because of a compound heterozygous genotype. However, a genotype-phenotype correlation could not be established for the detected ABCC6 mutations. In summary, our data give a further insight into the spectrum of ABCC6 mutations in PXE patients.
authors.affiliation: Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinik , der Ruhr-Universität Bochum, 32545 Bad Oeynhausen, Germany.
authors.forename: Doris
authors.initials: D
authors.lastname: Hendig
authors.forename: Veronika
authors.initials: V
authors.lastname: Schulz
authors.forename: Jutta
authors.initials: J
authors.lastname: Eichgrün
authors.forename: Christiane
authors.initials: C
authors.lastname: Szliska
authors.forename: Christian
authors.initials: C
authors.lastname: Götting
authors.forename: Knut
authors.initials: K
authors.lastname: Kleesiek
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002648:Child; D004252:DNA Mutational Analysis; D005260:Female; D006580:Genetic Carrier Screening; D005820:Genetic Testing; D005838:Genotype; D005858:Germany; D006801:Humans; D008297:Male; D008875:Middle Aged; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics*; D009154:Mutation / Q000235:genetics*; D010375:Pedigree; D011561:Pseudoxanthoma Elasticum / Q000235:genetics*
chemical_list: D027425:ATP-Binding Cassette, Sub-Family C Proteins; C102029:ABCC6 protein, human
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