@article {1715, title = {Five new OTOF gene mutations and auditory neuropathy.}, journal = {Int J Pediatr Otorhinolaryngol}, volume = {74}, year = {2010}, month = {2010 May}, pages = {494-8}, abstract = {

OBJECTIVE: Purpose of this paper is to analyse OTOF gene in a series of subjects affected by auditory neuropathy.

METHODS: Four children showing mild to profound prelingual deafness, confirmed by the absence of a clear and detectable responses at auditory brainstem responses (ABR), associated with the presence of bilateral OAE, were enrolled in the study.

RESULTS AND CONCLUSIONS: Genetic analysis identified five new mutations (a nonsense, a small and a large deletion and two splicing site mutations), and one missense mutation (F1795C) previously described. These results further confirm the role of OTOF gene in auditory neuropathy. In the absence of a context of neurological syndrome, the combination of absent ABR and positive OAE responses should lead to an auditory neuropathy diagnosis and to a mutational screening in OTOF.

}, keywords = {Auditory Diseases, Central, Deafness, Evoked Potentials, Auditory, Brain Stem, Female, Humans, Male, Membrane Proteins, Mutation, Otoacoustic Emissions, Spontaneous, Polymerase Chain Reaction}, issn = {1872-8464}, doi = {10.1016/j.ijporl.2010.02.004}, author = {Zadro, Cristina and Ciorba, Andrea and Fabris, Annalisa and Morgutti, Marcello and Trevisi, Patrizia and Gasparini, Paolo and Martini, Alessandro} } @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} }