Abstract:
:Familial ligand-defective apolipoprotein (apo) B-100 (FDB) is an autosomal codominant disorder which may give rise to hypercholesterolaemia. It is caused by the substitution of glutamine for arginine at codon 3500 of the apo B gene (apo B R3500Q), resulting in decreased binding of low density lipoprotein (LDL) to the LDL receptor. In order to search for other mutations in this region of the apo B gene, we have screened genomic DNA, obtained from 412 hypercholesterolaemic individuals, using heteroduplex analysis. Additional heteroduplex bands were observed following analysis of DNA from 11 individuals, nine of whom were heterozygous for apo B R3500Q. The two remaining individuals, both of Celtic origin, were shown by DNA sequencing to be heterozygous for a C-->T transition at nucleotide 10800 of the apo B gene, resulting in the substitution of cysteine for arginine at codon 3531 (apo B R3531C). Both had a strong family history of atherosclerosis and family studies revealed a further four individuals heterozygous for the mutation, three of whom were hypercholesterolaemic. Individuals heterozygous for apo B R3531C and R3500Q had mean +/- S.E.M. cholesterol concentrations of 7.82 +/- 0.68 and 8.53 +/- 0.31 mmol/l, respectively. These values were significantly higher than the value of 5.51 +/- 0.23 mmol/l observed in their unaffected relatives. These findings suggest that apo B R3531C is both less common in the UK and gives rise to a less severe form of hypercholesterolaemia than the classical 3500 mutation. In one of the families, the R3531C mutation occurred on a haplotype, compatible with that previously assigned to the mutation in a North American family also of Celtic origin. This is consistent with the mutation having been inherited from a common distant ancestor in individuals of Celtic origin.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Wenham PR,Henderson BG,Penney MD,Ashby JP,Rae PW,Walker SWdoi
10.1016/s0021-9150(96)06029-7subject
Has Abstractpub_date
1997-03-21 00:00:00pages
185-92issue
2eissn
0021-9150issn
1879-1484pii
S0021-9150(96)06029-7journal_volume
129pub_type
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