@article {8303, title = {Tracking of the origin of recurrent mutations of the BRCA1 and BRCA2 genes in the North-East of Italy and improved mutation analysis strategy.}, journal = {BMC Med Genet}, volume = {17}, year = {2016}, month = {2016}, pages = {11}, abstract = {

BACKGROUND: About 20 \% of hereditary breast cancers are caused by mutations in BRCA1 and BRCA2 genes. Since BRCA1 and BRCA2 mutations may be spread throughout the gene, genetic testing is usually performed by direct sequencing of entire coding regions. In some populations, especially if relatively isolated, a few number of recurrent mutations is reported, sometimes caused by founder effect.

METHODS: BRCA1 and BRCA2 screening for mutations was carried out on 1114 breast and/or ovarian cancer patients complying with the eligibility criteria for BRCA testing. Haplotype analysis was performed on the probands carrying recurrent mutations and their relatives, using two sets of microsatellite markers covering the BRCA1 (D17S588, D17S806, D17S902, D17S1325, D17S855, D17S1328, D17S800, and D17S250) and BRCA2 (D13S220, D13S267, D13S171, D13S1701, D13S1698, D13S260, D13S290, D13S1246) loci. The DMLE + 2.2 software was used to estimate the age of BRCA1 c.676delT and BRCA2 c.7806-2A > G. A multiplex PCR and two different primer extension assays were optimized and used for genotyping the recurrent mutations of the two genes.

RESULTS: In the time frame of almost 20 years of genetic testing, we have found that five BRCA1 and three BRCA2 mutations are recurrent in a substantial subset of carriers from North-East Italy and neighboring Istria, where they represent more than 50 \% of all mutations. Microsatellite analyses identified a common haplotype of different length for each mutation. Age estimation of BRCA1 c.676delT and BRCA2 c.7806-2A > G mutations revealed that they arose in the Friuli Venezia Giulia area about 86 and 94 generations ago, respectively. Suggestion of an association between BRCA2 c.7806-2A > G and risk of breast cancer in males has emerged. Finally, we developed a simple and efficient pre-screening test, performing an in-house primer extension SNaPshot{\textregistered} assay for the rapid identification of the eight recurrent mutations.

CONCLUSIONS: Proofs of common ancestry has been obtained for the eight recurrent mutations. The observed genotype-phenotype correlation and the proposed rapid mutation detection strategy could improve the clinical management of breast and ovarian patients in North-East of Italy and neighboring geographic areas.

}, keywords = {Adult, Aged, Alleles, BRCA1 Protein, BRCA2 Protein, Breast Neoplasms, Case-Control Studies, DNA Mutational Analysis, Female, Founder Effect, Genetic Testing, Genome-Wide Association Study, Genotyping Techniques, Haplotypes, Humans, Italy, Male, Microsatellite Repeats, Middle Aged, Mutation, Ovarian Neoplasms, Young Adult}, issn = {1471-2350}, doi = {10.1186/s12881-016-0274-6}, author = {Cini, Giulia and Mezzavilla, Massimo and Della Puppa, Lara and Cupelli, Elisa and Fornasin, Alessio and D{\textquoteright}Elia, Angela Valentina and Dolcetti, Riccardo and Damante, Giuseppe and Bertok, Sara and Miolo, Gianmaria and Maestro, Roberta and de Paoli, Paolo and Amoroso, Antonio and Viel, Alessandra} } @article {1693, title = {Modeling the effect of 3 missense AGXT mutations on dimerization of the AGT enzyme in primary hyperoxaluria type 1.}, journal = {J Nephrol}, volume = {23}, year = {2010}, month = {2010 Nov-Dec}, pages = {667-76}, abstract = {

INTRODUCTION: Mutations of the AGXT gene encoding the alanine:glyoxylate aminotransferase liver enzyme (AGT) cause primary hyperoxaluria type 1 (PH1). Here we report a molecular modeling study of selected missense AGXT mutations: the common Gly170Arg and the recently described Gly47Arg and Ser81Leu variants, predicted to be pathogenic using standard criteria.

METHODS: Taking advantage of the refined 3D structure of AGT, we computed the dimerization energy of the wild-type and mutated proteins.

RESULTS: Molecular modeling predicted that Gly47Arg affects dimerization with a similar effect to that shown previously for Gly170Arg through classical biochemical approaches. In contrast, no effect on dimerization was predicted for Ser81Leu. Therefore, this probably demonstrates pathogenic properties via a different mechanism, similar to that described for the adjacent Gly82Glu mutation that affects pyridoxine binding.

CONCLUSION: This study shows that the molecular modeling approach can contribute to evaluating the pathogenicity of some missense variants that affect dimerization. However, in silico studies--aimed to assess the relationship between structural change and biological effects--require the integrated use of more than 1 tool.

}, keywords = {Amino Acid Sequence, Female, Humans, Male, Models, Molecular, Molecular Sequence Data, Mutation, Missense, Protein Multimerization, Transaminases}, issn = {1121-8428}, author = {Robbiano, Angela and Frecer, Vladimir and Miertus, Jan and Zadro, Cristina and Ulivi, Sheila and Bevilacqua, Elena and Mandrile, Giorgia and De Marchi, Mario and Miertus, Stanislav and Amoroso, Antonio} }