Percorrer por autor "Caillaud, C."
A mostrar 1 - 4 de 4
Resultados por página
Opções de ordenação
- Gaucher disease in Tunisia: High frequency of the most common mutationsPublication . Cherif, W.; Ben Turkia, H.; Ben Rhouma, F.; Riahi, I.; Chemli, J.; Kefi, R.; Messai, H.; Amaral, O.; Miranda, M.C.; Caillaud, C.; Tebib, N.; Ben Dridi, M.F.; Abdelhak, S.
- Gaucher disease: the origins of the Ashkenazi Jewish N370S and 84GG acid beta-glucosidase mutationsPublication . Diaz, G.A.; Gelb, B.D.; Risch, N.; Nygaard, T.G.; Frisch, A.; Cohen, I.J.; Miranda, C.S.; Amaral, O.; Maire, I.; Poenaru, L.; Caillaud, C.; Weizberg, M.; Mistry, P.; Desnick, R.J.Type 1 Gaucher disease (GD), a non-neuronopathic lysosomal storage disorder, results from the deficient activity of acid beta-glucosidase (GBA). Type 1 disease is panethnic but is more prevalent in individuals of Ashkenazi Jewish (AJ) descent. Of the causative GBA mutations, N370S is particularly frequent in the AJ population, (q approximately .03), whereas the 84GG insertion (q approximately .003) occurs exclusively in the Ashkenazim. To investigate the genetic history of these mutations in the AJ population, short tandem repeat (STR) markers were used to map a 9.3-cM region containing the GBA locus and to genotype 261 AJ N370S chromosomes, 60 European non-Jewish N370S chromosomes, and 62 AJ 84GG chromosomes. A highly conserved haplotype at four markers flanking GBA (PKLR, D1S1595, D1S2721, and D1S2777) was observed on both the AJ chromosomes and the non-Jewish N370S chromosomes, suggesting the occurrence of a founder common to both populations. Of note, the presence of different divergent haplotypes suggested the occurrence of de novo, recurrent N370S mutations. In contrast, a different conserved haplotype at these markers was identified on the 84GG chromosomes, which was unique to the AJ population. On the basis of the linkage disequilibrium (LD) delta values, the non-Jewish European N370S chromosomes had greater haplotype diversity and less LD at the markers flanking the conserved haplotype than did the AJ N370S chromosomes. This finding is consistent with the presence of the N370S mutation in the non-Jewish European population prior to the founding of the AJ population. Coalescence analyses for the N370S and 84GG mutations estimated similar coalescence times, of 48 and 55.5 generations ago, respectively. The results of these studies are consistent with a significant bottleneck occurring in the AJ population during the first millennium, when the population became established in Europe.
- Molecular diagnosis of Gaucher disease in TunisiaPublication . Cherif, W.; Ben Turkia, H.; Ben Rhouma, F.; Riahi, I.; Chemli, J.; Amaral, O.; Sá Miranda, M.C.; Caillaud, C.; Kaabachi, N.; Tebib, N.; Ben Dridi, M.F.[ENG] Gaucher disease is a lysosomal storage disorder caused by a deficiency of the enzyme acid b-glucosidase. In order to determine the mutation spectrum in Tunisia, we performed recurrent mutation screening in 30 Tunisian patients with Gaucher disease. Screening of recurrent mutation by PCR/RFLP and direct sequencing had shown that N370S was the most frequent mutation (22/50 mutant alleles, 44%), followed by L444P mutation, which is found in 16% (8/50 mutant alleles). The recombinant allele (RecNciI)represented 14%. Our findings revealed that the genotype N370S/RecNciI was mosst frequent in patients with childhood onset and it was associated with severe visceral involvement. The screening of these three mutations provided a simple tool for molecular diagnosis of Gaucher disease in Tunisian patients and allowed also genetic counselling for their family members.
- Mutation spectrum of Gaucher disease in Tunisia: high frequency of N370S/Rec NciI compound heterozygousPublication . Cherif, W.; Ben Turkia, H.; Tebib, N.; Amaral, O.; Ben Rhouma, F.; Abdelmoula MS, M.S.; Azzouz, H.; Caillaud, C.; Sà Miranda, M.C.; Abdelhak, S.; Ben Dridi, M.F.Gaucher disease is the most common lysosomal storage disorder, it results from the inherited deficiency of the enzyme glucocerebrosidase, the accumulation of its substrate causes many clinical manifestations. Since the discovery of GBA gene, more than 200 different mutations have been identified, but only handful mutations are recurrent (N370S, L444P and c.84insG). In order to determine the mutation spectrum in Tunisia, we performed recurrent mutation screening in ten unrelated Tunisian children with Gaucher disease. Screening of recurrent mutation by PCR/RFLP and direct sequencing, has shown that N370S is the most frequent mutation (6/20 mutant alleles, 30%), followed by recombinant allele (RecNciI) which is found in five patients (5/20 mutant alleles, 25%), the L444P mutation represent 20% (4/20 mutant alleles). Our findings revealed that five among ten studied patients, were compound heterozygous N370S/RecNciI (50%). The screening of these mutations provides a simple tool for molecular diagnosis of Gaucher disease in Tunisian patients and allows also genetic counselling for their family members.