title: Two novel frameshift mutations in the low density lipoprotein receptor gene generated by endogenous sequence-directed mechanisms.
abstract: DNA samples from 60 unrelated Belgian hypercholesterolemic patients were subjected to heteroduplex analysis of exon 4 of the low density lipoprotein receptor (LDLR) gene. Aberrant mobility bands were detected in 2 patients and the underlying mutations were characterized by DNA sequence analysis. Both mutations, a 19-bp insertion at codon 141 and a 23bp deletion at codon 168, produce premature stop codons in the highly conserved ligand binding domain of the mature LDLR. Sequence data indicated that mispairing between short direct repeats during DNA replication is the most probable mechanism by which these mutations could have arisen. Our observations are consistent with an endogenous sequence-directed mechanism of mutagenesis.
authors.affiliation: Department of Human Genetics, Faculty of Medicine, University of Stellenbosch, Tygerberg, Africa.
authors.forename: A V
authors.initials: AV
authors.lastname: Peeters
authors.forename: L F
authors.initials: LF
authors.lastname: Van Gaal
authors.forename: L
authors.initials: L
authors.lastname: Theart
authors.forename: E
authors.initials: E
authors.lastname: Langenhoven
authors.forename: M J
authors.initials: MJ
authors.lastname: Kotze
mesh_terms: D000293:Adolescent; D000328:Adult; D001483:Base Sequence; D002648:Child; D005260:Female; D016368:Frameshift Mutation; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D010375:Pedigree; D011973:Receptors, LDL / Q000235:genetics*; D012091:Repetitive Sequences, Nucleic Acid
chemical_list: D011973:Receptors, LDL