LDL-R and Apo-B-100 gene mutations in Polish familial hypercholesterolemias.
A group of 30 Polish families with clinical signs of familial hypercholesterolemia was studied for the presence of germ-line mutations in the LDL-R and ApoB-100 genes. Screening of the LDL-R gene was performed at the genomic DNA level by single-strand conformation polymorphism analysis of all 18 exons and extended by sequencing of polymerase chain reaction (PCR) products showing abnormalities. The occurrence of large LDL-R gene alterations was evaluated by analysis of restriction enzyme patterns on Southern blots and using the long-PCR technique. The ApoB-100 gene was studied by combined allele-specific and asymmetric PCR for the occurrence of the common B-3500 missense mutation G to A at nucleotide position 10,708. Germ-line mutations were found in 17 families. In 12 of them LDL-R gene mutations were detected. Three of 11 different mutations had previously been described in other populations (3-bp deletion of codon 197; Ser156Leu; Gly571Glu). Of the mutations not previously recognized and identified in Polish families, there were three small deletions (2-bp deletion AG at codon 291; 4-bp deletion CCCT at codons 661-662; 1-bp deletion A at codon 830), and four point mutations (Arg239Stop, Cys331Stop, Asn543Ser, Gln665Stop). Additionally, one large (approximately 1-kb) LDL-R gene deletion between exons 6 and 9 was identified. In five families, the B-3500 mutation within the ApoB-100 gene was revealed.
Górski
B
B
Department of Genetics and Pathology, Pomeranian Medical Academy, Szczecin, Poland. gorski@free.polbox.pl
Kubalska
J
J
Naruszewicz
M
M
Lubiński
J
J
D001055:Apolipoproteins B / Q000235:genetics*; D002648:Child; D006801:Humans; D006937:Hypercholesterolemia / Q000235:genetics*; D008875:Middle Aged; D009154:Mutation; D011044:Poland; D011973:Receptors, LDL / Q000235:genetics*
D001055:Apolipoproteins B; D011973:Receptors, LDL