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A G ‐1 ‐to‐A acceptor splice site LDLR mutant allele leads to reduced relative transcript levels in patients with heterozygous familial hypercholesterolemia
Author(s) -
Jensen H. K.,
Jensen L. G.,
Hansen P. S.,
Bolund L.,
Færgeman D.,
Gregersen N.
Publication year - 1996
Publication title -
clinical genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.543
H-Index - 102
eISSN - 1399-0004
pISSN - 0009-9163
DOI - 10.1111/j.1399-0004.1996.tb03282.x
Subject(s) - familial hypercholesterolemia , ldl receptor , allele , genetics , splice site mutation , biology , rna splicing , mutant , mutation , splice , intron , compound heterozygosity , microbiology and biotechnology , gene , endocrinology , cholesterol , lipoprotein , rna
A plethora of different mutations in the gene for the low density receptor (LDLR) are responsible for the autosomal dominant inherited disorder familial hypercholesterolemia (FH). However, only a few splice site mutations have been identified in this gene. We here report a defect presumably affecting the splicing of precursor mRNA, resulting from a novel mutation, a G to A transition at the terminal nucleotide of intron 12, of the LDLR gene detected in three unrelated families with heterozygous FH. This mutation markedly reduced the steady‐state transcript level of the mutant LDLR allele as compared to the corresponding normal LDLR allele in heterozygous FH patients as measured by a fluorescence based, allele‐specific quantitation technique. In the FH families, the acceptor splice site mutation cosegregates with hypercholesterolemia, and it is associated with onset of ischemic heart disease in the fifth and sixth decade of life.