alexa A new but frequent mutation of apoB-100-apoB His3543Tyr.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Genetic Syndromes & Gene Therapy

Author(s): Soufi M, Sattler AM, Maerz W, Starke A, Herzum M,

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Abstract ApolipoproteinB 100 (apoB-100) is an important component of atherogenic lipoproteins such as LDL and serves as a ligand for the LDL-receptor. Familial defective apolipoproteinB 100 (FDB) is caused by a R3500Q mutation of the apoB gene and results in decreased binding of LDL to the LDL-receptor. So far FDB is the most frequent and best studied alteration of apoB-100. Apart from this, three other apoB mutations, R3500W, R3531C and R3480W, affecting binding to the LDL-receptor are known to date. We screened the apoB gene segment of codons 3448-3561 by denaturing gradient gel electrophoresis (DGGE) analysis in a total of 853 consecutively sampled German patients undergoing diagnostic coronary angiography for suspected CAD. By this, a new single base mutation was detected and confirmed by DNA sequencing. The mutation, CAC(3543)TAC results in a His3543Tyr substitution in apoB-100 (H3543Y). The prevalence of heterozygotes for H3543Y in the study population was 0.47\% compared to 0.12\% for the known Arg 3500 Gln (R3500Q) mutation. In conclusion, the new mutation is four times more frequent than "classical" FDB and thus appears to be the most common apoB mutation in Germany. This article was published in Atherosclerosis and referenced in Journal of Genetic Syndromes & Gene Therapy

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