Analysis of Sequence Variations in the LDL Receptor Gene in Spain: General Gene Screening or Search for Specific Alterations?
Open Access
- 1 June 2006
- journal article
- research article
- Published by Oxford University Press (OUP) in Clinical Chemistry
- Vol. 52 (6) , 1021-1025
- https://doi.org/10.1373/clinchem.2006.067645
Abstract
Background: Familial hypercholesterolemia (FH) is a frequent form of autosomal-dominant hypercholesterolemia that predisposes to premature coronary atherosclerosis. FH is caused by sequence variations in the gene coding for the LDL receptor (LDLR). This gene has a wide spectrum of sequence variations, and genetic diagnosis can be performed by 2 strategies. Methods: Point variations and large rearrangements were screened along all the LDLR gene (promoter, exons, and flanking intron sequences). Results: We screened a sample of 129 FH probands from the Valencian Community, Spain, and identified 54 different LDLR sequence variations. The most frequent (10% of cases) was 111insA, and 60% of the variants had a frequency as low as 1%. A previously described method for detection of known sequence variations in the Spanish population by DNA array analysis allowed the identification of only ∼50% of patients with a variant LDLR gene and ∼40% of the screened samples. Conclusion: Our results indicate that the adequate procedure to identify LDLR sequence variations in outbreed populations should include screening of the entire gene.Keywords
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