Abstract:
:During a survey of the mutations of the low density lipoprotein receptor (LDL-R) gene in Italian patients with familial hypercholesterolemia (FH), we identified a novel point mutation, that creates a new EcoRI site at the 5' end of exon 7, in a heterozygous FH subject (FH-100). The sequence of a cDNA fragment encompassing exon 7 showed the presence of a G-->T transversion in codon 297; this created a new EcoRI site and produced a missense mutation, leading to a Cys297-->Phe substitution in repeat A of the epidermal growth factor (EGF) precursor homology domain of LDL-R. Since the substitution of Cys297 disrupts the intracellular transport of the LDL-R protein, as previously demonstrated by site-directed mutagenesis, we suggest that this mutation is the cause of FH in the FH-100 proband. We screened the DNA of 303 Italian FH patients by amplification of exon 7 from genomic DNA followed by digestion with EcoRI or by Southern blotting. Two individuals (FH-64 and FH-127) were found to be carriers of the Cys297-->Phe mutation. Restriction fragment length polymorphism analysis demonstrated that, in two kindreds (FH-64 and FH-100), the haplotype in linkage with the Cys297-->Phe mutation was the same, suggesting the presence of a common ancestor. The Cys297-->Phe mutation has been designated FHTrieste after the name of the city in Northern Italy from which probands FH-100 and FH-127 originate.
journal_name
Hum Genetjournal_title
Human geneticsauthors
Lelli N,Garuti R,Pedrazzi P,Ghisellini M,Simone ML,Tiozzo R,Cattin L,Valenti M,Rolleri M,Bertolini Sdoi
10.1007/BF00202819subject
Has Abstract,Author List Incompletepub_date
1994-05-01 00:00:00pages
538-40issue
5eissn
0340-6717issn
1432-1203journal_volume
93pub_type
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