@article {10419, title = {Genetic profile of patients with early onset inflammatory bowel disease.}, journal = {Gene}, volume = {645}, year = {2018}, month = {2018 Mar 01}, pages = {18-29}, abstract = {

Inflammatory Bowel disease (IBD) is a widespread pathological condition with clinical heterogeneity and with different levels of severity. Although IBD usually occurs in young adults, onset in childhood and infancy are described in patients within the 10th and second year of age. By genome-wide association studies and meta-analysis, several genetic loci have been identified associated with an increased risk of developing IBD in Western populations with variants that may alter the normal mucosal immunity in the gastrointestinal tract. The clinical complexity and the heterogeneity of the IBD phenotype probably reflect the presence of genetic heterogeneity where different genes or combinations of them may be involved, together with environmental factors. We hypothesized that patients with early onset IBD could have either more severe genetic variants in genes associated with IBD or multiple variants in different genes. Under the multifactorial diseases is crucial to consider the small contribution of a single variant in all not only to other small variations in the same gene but also in different genes belonging to the same pathway. We performed direct gene sequencing looking for 94 variations in NOD2, ATG16L1, IL23R, IL10R, IL10 and XIAP genes previously shown as correlated with IBD both in multifactorial and in Mendelian models. All variants identified are known in literature as being associated with IBD except for three variants in the genes NOD2, IL10 and IL10RB that even though present in online databases have never been involved in association studies on IBD patients. Moreover, we coupled genetic variants identification with an accurate "in silico" analysis to verify their predictive impact on the protein structure and function. The in-silico prediction of these variants results as benign therefore even if they exhibit a very low frequency in control population being benign, they cannot be considered pathogenic as monogenic disease but fall within the multifactorial range. The variants identified in our study partially reflect the association data described in the literature but there are no significant differences with the onset of disease (VEO vs EO-IBD).

}, keywords = {Age of Onset, Autophagy-Related Proteins, Child, Child, Preschool, Computer Simulation, Female, Genetic Predisposition to Disease, Genome-Wide Association Study, Humans, Infant, Inflammatory Bowel Diseases, Interleukin-10, Male, Nod2 Signaling Adaptor Protein, Polymorphism, Single Nucleotide, Receptors, Interleukin, Receptors, Interleukin-10, Sequence Analysis, DNA, X-Linked Inhibitor of Apoptosis Protein}, issn = {1879-0038}, doi = {10.1016/j.gene.2017.12.029}, author = {Girardelli, Martina and Basaldella, Federica and Paolera, Sara Della and Vuch, Josef and Tommasini, Alberto and Martelossi, Stefano and Crovella, Sergio and Bianco, Anna Monica} } @article {8083, title = {Genetics of inflammatory bowel disease from multifactorial to monogenic forms.}, journal = {World J Gastroenterol}, volume = {21}, year = {2015}, month = {2015 Nov 21}, pages = {12296-310}, abstract = {

Inflammatory bowel disease (IBD) is a group of chronic multifactorial disorders. According to a recent study, the number of IBD association loci is increased to 201, of which 37 and 27 loci contribute specifically to the development of Crohn{\textquoteright}s disease and ulcerative colitis respectively. Some IBD associated genes are involved in innate immunity, in the autophagy and in the inflammatory response such as NOD2, ATG16L1 and IL23R, while other are implicated in immune mediated disease (STAT3) and in susceptibility to mycobacterium infection (IL12B). In case of early onset of IBD (VEO-IBD) within the 6(th) year of age, the disease may be caused by mutations in genes responsible for severe monogenic disorders such as the primary immunodeficiency diseases. In this review we discuss how these monogenic disorders through different immune mechanisms can similarly be responsible of VEO-IBD phenotype. Moreover we would highlight how the identification of pathogenic genes by Next Generation Sequencing technologies can allow to obtain a rapid diagnosis and to apply specific therapies.

}, issn = {2219-2840}, doi = {10.3748/wjg.v21.i43.12296}, author = {Bianco, Anna Monica and Girardelli, Martina and Tommasini, Alberto} } @article {1712, title = {A G to C transversion at the last nucleotide of exon 25 of the MYH9 gene results in a missense mutation rather than in a splicing defect.}, journal = {Eur J Med Genet}, volume = {53}, year = {2010}, month = {2010 Sep-Oct}, pages = {256-60}, abstract = {

MYH9-related disease (MYH9-RD) is a rare autosomal dominant disorder caused by mutations in MYH9, the gene encoding the heavy chain of non-muscle myosin IIA. Patients present with congenital macrothrombocytopenia and inclusion bodies in neutrophils and might develop sensorineural deafness, presenile cataract, and/or progressive nephropathy leading to end-stage renal failure. In two families with macrothrombocytopenia we identified a novel c.3485G~>~C mutation in the last nucleotide of exon 25. Bioinformatic tools for splice site prediction and minigene functional test predicted splicing anomalies of exon 25. However, analysis of RNA purified from patient{\textquoteright}s peripheral blood did not allowed us to detect any anomalies, suggesting that RNA processing is correct at least in this tissue. Therefore, we concluded that c.3485G~>~C leads to a novel missense mutation (p.Arg1162Thr) of myosin-9, which resulted to be slightly degraded in patient platelets. A precise definition of the effect of mutations is fundamental to improve our knowledge into the pathogenetic mechanisms responsible for the disease.

}, keywords = {Adolescent, Adult, Blood Platelets, Computational Biology, Exons, Female, Humans, Inclusion Bodies, Kidney Failure, Chronic, Molecular Motor Proteins, Mutation, Missense, Myosin Heavy Chains, Neutrophils, Nonmuscle Myosin Type IIA, Nucleotides, RNA Splicing, Thrombocytopenia}, issn = {1878-0849}, doi = {10.1016/j.ejmg.2010.06.010}, author = {Vettore, Silvia and De Rocco, Daniela and Gerber, Bernhard and Scandellari, Raffaella and Bianco, Anna Monica and Balduini, Carlo L and Pecci, Alessandro and Fabris, Fabrizio and Savoia, Anna} }