Familial hypercholesterolaemia caused by a non-sense mutation in codon 329 of the LDL receptor gene

Abstract

Solberg K, Rødningen OK, Tonstad S, Ose L, Leren TP. Familial hypercholesterolaemia caused by a non-sense mutation in codon 329 of the LDL receptor gene. Scand J Clin Lab Invest 1994;54:605-9

Analysis of single-strand conformation polymorphisms (SSCP) was employed to screen familial hypercholesterolaemia (FH) subjects for point mutations in exon 7 of the low density lipoprotein receptor (LDLR) gene. An abnormal band pattern was found in one out of 100 unrelated FH subjects. The underlying mutation was found by DNA sequencing to be due to heterozygosity (C/T) at nucleotide 1048. Nucleotide 1048 is the first nucleotide of codon 329, and is located within the domain that has a high degree of homology with the precursor for epidermal growth factor. The C → T transition, referred to as FH-Fossum, changes codon 329 from CGA_Arg to TGA_Stop. The mutation is expected to cause a class 1 receptor defect.

Key Words:

• Cholesterol
• DNA sequencing
• familial hypercholesterolaemia
• low density lipoprotein receptor
• mutation
• single-strand conformation polymorphisms