Autosomal recessive hypercholesterolaemia in Sardinia, Italy, and mutations in ARH: A clinical and molecular genetic analysis

Marcello Arca, Giovanni Zuliani, Kenneth Wilund, Filomena Campagna, Renato Fellin, Stefano Bertolini, Sebastiano Calandra, Giorgio Ricci, Nicola Glorioso, Mario Maioli, Paolo Pintus, Ciriaco Carru, Fausto Cossu, Jonathan Cohen, Helen H. Hobbs

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

Background. Autosomal recessive hypercholesterolaemia (ARH) is caused by mutations in a putative adaptor protein called ARH. This recessive disorder, characterised by severe hypercholesterolaemia, xanthomatosis, and premature coronary artery disease, is rare except on the island of Sardinia, Italy. Our aim was to ascertain why ARH is more common on Sardinia than elsewhere. Methods. We obtained detailed medical histories, did physical examinations, measured concentrations of lipoproteins, and harvested genomic DNA from 28 Sardinians with ARH from 17 unrelated families. We sequenced the coding regions and consensus splice sites of ARH in probands from these families, and from 40 individuals of non-Sardinian origin who had an autosomal recessive form of hypercholesterolaemia of unknown cause. Findings. Two ARH mutations, a frameshift mutation (c432insA) in exon 4 (ARH1) and a nonsense mutation (c65G→A) in exon 1 (ARH2), were present in all of the 17 unrelated families with ARH. Three of the ARH alleles contained both mutations, as a result of an ancient recombination between ARH1 and ARH2. No regional clustering of the three mutant alleles within Sardinia was apparent. Furthermore, four Italians from the mainland with autosomal recessive hypercholesterolaemia were homozygous for ARH1. Interpretation. The small number, high frequency, and dispersed distribution of ARH mutations on Sardinia are consistent with these mutations being ancient and maintained in the Sardinian population because of geographic isolation.

Original languageEnglish (US)
Pages (from-to)841-847
Number of pages7
JournalLancet
Volume359
Issue number9309
DOIs
StatePublished - Mar 9 2002

ASJC Scopus subject areas

  • Medicine(all)

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