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Mucolipidosis type IV: Novel MCOLN1 mutations in Jewish and non-Jewish patients and the frequency of the disease in the Ashkenazi Jewish population

✍ Scribed by Ruth Bargal; Nili Avidan; Tzvia Olender; Edna Ben Asher; Marcia Zeigler; Annick Raas-Rothschild; Ayala Frumkin; Omer Ben-Yoseph; Yechiel Friedlender; Doron Lancet; Gideon Bach

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 256 KB
Volume: 17
Category: Article
ISSN: 1059-7794
DOI: 10.1002/humu.1115

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✦ Synopsis

The gene MCOLN1 is mutated in Mucolipidosis type IV (MLIV), a neurodegenerative, recessive, lysosomal storage disorder. The disease is found in relatively high frequency among Ashkenazi Jews due to two founder mutations that comprise 95% of the MLIV alleles in this population [Bargal et al., 2000]. In this report we complete the mutation analysis of Jewish and non-Jewish MLIV patients whose DNA were available to us. Four novel mutations were identified in the MCOLN1 gene of severely affected patients: two missense, T232P and F465L; a nonsense, R322X; and an 11-bp insertion in exon 12. The nonsense mutation (R322X) was identified in two unrelated patients with different haplotypes in the MCOLN1 chromosomal region, indicating a mutation hotspot in this CpG site. An in-frame deletion (F408del) was identified in a patient with unusual mild psychomotor retardation. The frequency of MLIV in the general Jewish Ashkenazi population was estimated in a sample of 2,000 anonymous, unrelated individuals assayed for the two founder mutations. This analysis indicated a heterozygotes frequency of about 1/100. A preferred nucleotide numbering system for MCOLN1 mutations is presented and the issue of a screening program for the detection of high-risk families in the Jewish Ashkenazi population is discussed.

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