@article {10534, title = {Targeted sequencing identifies novel variants involved in autosomal recessive hereditary hearing loss in Qatari families.}, journal = {Mutat Res}, volume = {800-802}, year = {2017}, month = {2017 08}, pages = {29-36}, abstract = {

Hereditary hearing loss is characterized by a very high genetic heterogeneity. In the Qatari population the role of GJB2, the worldwide HHL major player, seems to be quite limited compared to Caucasian populations. In this study we analysed 18 Qatari families affected by non-syndromic hearing loss using a targeted sequencing approach that allowed us to analyse 81 genes simultaneously. Thanks to this approach, 50\% of these families (9 out of 18) resulted positive for the presence of likely causative alleles in 6 different genes: CDH23, MYO6, GJB6, OTOF, TMC1 and OTOA. In particular, 4 novel alleles were detected while the remaining ones were already described to be associated to HHL in other ethnic groups. Molecular modelling has been used to further investigate the role of novel alleles identified in CDH23 and TMC1 genes demonstrating their crucial role in Ca2+ binding and therefore possible functional role in proteins. Present study showed that an accurate molecular diagnosis based on next generation sequencing technologies might largely improve molecular diagnostics outcome leading to benefits for both genetic counseling and definition of recurrence risk.

}, keywords = {Adolescent, Alleles, Cadherins, Child, Child, Preschool, Connexins, Female, GPI-Linked Proteins, Hearing Loss, Sensorineural, Humans, Infant, Male, Membrane Proteins, Models, Molecular, Mutation, Myosin Heavy Chains, Pedigree, Protein Conformation, Qatar, Sequence Analysis, DNA}, issn = {1873-135X}, doi = {10.1016/j.mrfmmm.2017.05.001}, author = {Alkowari, Moza K and Vozzi, Diego and Bhagat, Shruti and Krishnamoorthy, Navaneethakrishnan and Morgan, Anna and Hayder, Yousra and Logendra, Barathy and Najjar, Nehal and Gandin, Ilaria and Gasparini, Paolo and Badii, Ramin and Girotto, Giorgia and Abdulhadi, Khalid} } @article {8067, title = {Target sequencing approach intended to discover new mutations in non-syndromic intellectual disability.}, journal = {Mutat Res}, volume = {781}, year = {2015}, month = {2015 Nov}, pages = {32-6}, abstract = {

The technological improvements over the last years made considerable progresses in the knowledge of the etiology of intellectual Disability (ID). However, at present very little is known about the genetic heterogeneity underlying the non-syndromic form of ID (NS-ID). To investigate the genetic basis of NS-ID we analyzed 43 trios and 22 isolated NS-ID patients using a targeted sequencing (TS) approach. 71 NS-ID genes have been selected and sequenced in all subjects. We found putative pathogenic mutations in 7 out of 65 patients. The pathogenic role of mutations was evaluated through sequence comparison and structural analysis was performed to predict the effect of alterations in a 3D computational model through molecular dynamics simulations. Additionally, a deep patient clinical re-evaluation has been performed after the molecular results. This approach allowed us to find novel pathogenic mutations with a detection rate close to 11\% in our cohort of patients. This result supports the hypothesis that many NS-ID related genes still remain to be discovered and that NS-ID is a more complex phenotype compared to syndromic form, likely caused by a complex and broad interaction between genes alterations and environment factors.

}, issn = {1873-135X}, doi = {10.1016/j.mrfmmm.2015.09.002}, author = {Morgan, Anna and Gandin, Ilaria and Belcaro, Chiara and Palumbo, Pietro and Palumbo, Orazio and Biamino, Elisa and Dal Col, Valentina and Laurini, Erik and Pricl, Sabrina and Bosco, Paolo and Carella, Massimo and Ferrero, Giovanni Battista and Romano, Corrado and d{\textquoteright}Adamo, Adamo Pio and Faletra, Flavio and Vozzi, Diego} } @article {8028, title = {Two-gene mutation in a single patient: Biochemical and functional analysis for a correct interpretation of exome results.}, journal = {Mol Med Rep}, volume = {12}, year = {2015}, month = {2015 Oct}, pages = {6128-32}, abstract = {

Next-generation sequencing (NGS) has generated a large amount of sequence data with the requirement of frequent critical revisions of reported mutations. This innovative tool has proved to be effective in detecting pathogenic mutations; however, it requires a certain degree of experience to identify incidental findings. In the present study, whole exome sequencing analysis was performed for the molecular diagnosis and correct genotype/phenotype correlation between parents and a patient presenting with an atypical phenotype. In addition, mevalonic acid quantification and frequency analysis of detected variants in public databases and X-chromosome inactivation (XCI) studies on the patient{\textquoteright}s mother were performed. V377I as well as the S135L mutations were identified on the mevalonate kinase deficiency gene and the levels of mevalonic acid in the patient were 5,496 {\textmu}g/ml. A D59G variation, reported in ESP6500 in two healthy individuals, was found on the Martin Probst syndrome gene (RAB40AL). Based on XCI studies on the patient{\textquoteright}s mother, it is likely that RAB40AL escapes XCI, while still remaining balanced. In conclusion, the results of the present study indicated that the Martin Probst syndrome is an X-linked condition, which is probably not caused by RAB40AL mutations. Although NGS is a powerful tool to identify pathogenic mutations, the analysis of genetic data requires expert critical revision of all detected variants.

}, issn = {1791-3004}, doi = {10.3892/mmr.2015.4215}, author = {Bianco, Anna Monica and Faletra, Flavio and Vozzi, Diego and Girardelli, Martina and Knowles, Alessandra and Tommasini, Alberto and Zauli, Giorgio and Marcuzzi, Annalisa} }