@article {10822, title = {Next-generation sequencing identified SPATC1L as a possible candidate gene for both early-onset and age-related hearing loss.}, journal = {Eur J Hum Genet}, volume = {27}, year = {2019}, month = {2019 01}, pages = {70-79}, abstract = {

Hereditary hearing loss (HHL) and age-related hearing loss (ARHL) are two major sensory diseases affecting millions of people worldwide. Despite many efforts, additional HHL-genes and ARHL genetic risk factors still need to be identified. To fill this gap a large genomic screening based on next-generation sequencing technologies was performed. Whole exome sequencing in a 3-generation Italian HHL family and targeted re-sequencing in 464 ARHL patients were performed. We detected three variants in SPATC1L: a nonsense allele in an HHL family and a frameshift insertion and a missense variation in two unrelated ARHL patients. In silico molecular modelling of all variants suggested a significant impact on the structural stability of the protein itself, likely leading to deleterious effects and resulting in truncated isoforms. After demonstrating Spatc1l expression in mice inner ear, in vitro functional experiments were performed confirming the results of the molecular modelling studies. Finally, a candidate-gene population-based statistical study in cohorts from Caucasus and Central Asia revealed a statistically significant association of SPATC1L with normal hearing function at low and medium hearing frequencies. Overall, the amount of different genetic data presented here (variants with early-onset and late-onset hearing loss in addition to genetic association with normal hearing function), together with relevant functional evidence, likely suggest a role of SPATC1L in hearing function and loss.

}, issn = {1476-5438}, doi = {10.1038/s41431-018-0229-9}, author = {Morgan, Anna and Vuckovic, Dragana and Krishnamoorthy, Navaneethakrishnan and Rubinato, Elisa and Ambrosetti, Umberto and Castorina, Pierangela and Franz{\`e}, Annamaria and Vozzi, Diego and La Bianca, Martina and Cappellani, Stefania and Di Stazio, Mariateresa and Gasparini, Paolo and Girotto, Giorgia} } @article {3499, title = {Next generation sequencing in nonsyndromic intellectual disability: from a negative molecular karyotype to a possible causative mutation detection.}, journal = {Am J Med Genet A}, volume = {164A}, year = {2014}, month = {2014 Jan}, pages = {170-6}, abstract = {

The identification of causes underlying intellectual disability (ID) is one of the most demanding challenges for clinical Geneticists and Researchers. Despite molecular diagnostics improvements, the vast majority of patients still remain without genetic diagnosis. Here, we report the results obtained using Whole Exome and Target Sequencing on nine patients affected by isolated ID without pathological copy number variations, which were accurately selected from an initial cohort of 236 patients. Three patterns of inheritance were used to search for: (1) de novo, (2) X-linked, and (3) autosomal recessive variants. In three of the nine proband-parent trios analyzed, we identified and validated two de novo and one X-linked potentially causative mutations located in three ID-related genes. We proposed three genes as ID candidate, carrying one de novo and three X-linked mutations. Overall, this systematic proband-parent trio approach using next generation sequencing could explain a consistent percentage of patients with isolated ID, thus increasing our knowledge on the molecular bases of this disease and opening new perspectives for a better diagnosis, counseling, and treatment.

}, keywords = {Computational Biology, Exome, Female, Genes, Recessive, Genes, X-Linked, Genome-Wide Association Study, High-Throughput Nucleotide Sequencing, Humans, Intellectual Disability, Karyotype, Male, Mutation, Workflow}, issn = {1552-4833}, doi = {10.1002/ajmg.a.36274}, author = {Athanasakis, Emmanouil and Licastro, Danilo and Faletra, Flavio and Fabretto, Antonella and Dipresa, Savina and Vozzi, Diego and Morgan, Anna and d{\textquoteright}Adamo, Adamo P and Pecile, Vanna and Biarn{\'e}s, Xevi and Gasparini, Paolo} } @article {3477, title = {A novel P2RX2 mutation in an Italian family affected by autosomal dominant nonsyndromic hearing loss.}, journal = {Gene}, volume = {534}, year = {2014}, month = {2014 Jan 25}, pages = {236-9}, abstract = {

Hereditary hearing loss (HHL) is a common disorder accounting for at least 60\% of prelingual deafness. It is characterized by a large genetic heterogeneity, and despite the presence of a major gene, still there is a need to search for new causative mutations/genes. Very recently, a mutation within ATP-gated P2X(2) receptor (ligand-gated ion channel, purinergic receptor 2) gene (P2RX2) at DNFA41 locus has been reported leading to a bilateral and symmetrical sensorineural non-syndromic autosomal dominant HHL in two Chinese families. We performed a linkage analysis in a large Italian family with a dominant pattern of inheritance showing a significant 3.31 LOD score in a 2Mb region overlapping with the DNFA41 locus. Molecular analyses of P2RX2 identified a novel missense mutation (p.Gly353Arg) affecting a residue highly conserved across species. Visual inspection of the protein structure as obtained from comparative modeling suggests that substitution of the small glycine residue with a charged bulky residue such as an arginine that is close to the {\textquoteright}neck{\textquoteright} of the region responsible for ion channel gating should have a high energetic cost and should lead to a severely destabilization of the fold. The identification of a second most likely causative mutation in P2RX2 gene further supports the possible role of this gene in causing autosomal dominant HHL.

}, keywords = {Amino Acid Sequence, Deafness, European Continental Ancestry Group, Female, Genotype, Hearing Loss, Sensorineural, Humans, Italy, Male, Molecular Sequence Data, Mutation, Missense, Pedigree, Receptors, Purinergic P2X2}, issn = {1879-0038}, doi = {10.1016/j.gene.2013.10.052}, author = {Faletra, Flavio and Girotto, Giorgia and d{\textquoteright}Adamo, Adamo Pio and Vozzi, Diego and Morgan, Anna and Gasparini, Paolo} }