| 1 | Am. J. Med. Genet. B Neuropsychiatr. Genet. 2008 Sep 147B: 707-11 |
|---|---|
| PMID | 18163405 |
| Title | Do mood symptoms subdivide the schizophrenia phenotype? Association of the GMP6A gene with a depression subgroup. |
| Abstract | Genetic studies of clinically defined subgroups ofschizophrenia病人可能减少表型heterogeneity ofschizophreniaand thus facilitate the identification of genes that confer risk to this disorder. Several latent class analyses have provided subgroups of psychotic disorders that show considerable consistency over these studies. The presence or absence of mood symptoms was found to contribute most to the delineations of these subgroups. In this study we used six previously published subtypes of psychosis derived from latent class analysis of a large sample of psychosis patients. In 280schizophreniapatients and 525 healthy controls we investigated the associations of these subgroups with myelin related genes. After bonferroni correction we found an association of the glycoprotein M6A gene (GPM6A) with the subgroup ofschizophreniapatients with high levels of depression (P-corrected = 0.006). Borderline association of the microtubulin associated protein tau (MAPT) with a primarily non-affective group ofschizophreniapatients (P-corrected = 0.052) was also observed.GPM6Amodulates the influence of stress on the hippocampus in animals. Thus our findings could suggest that GMP6A plays a role in the stress-induced hippocampal alterations that are found in psychiatric disorders in general andschizophreniain particular. Overall, these finding suggests that investigating subgroups ofschizophreniabased symptoms profile and particularly mood symptoms can facilitate genetic studies ofschizophrenia. |
| SCZ Keywords | schizophrenia |
| 2 | J. Neurosci. Res. 2015 Feb 93: 215-29 |
| PMID | 25242528 |
| Title | Tyrosine 251 at the C-terminus of neuronal glycoprotein M6a is critical for neurite outgrowth. |
| Abstract | Neuronal glycoprotein M6a is involved in neuronal plasticity, promoting neurite and filopodia outgrowth and, likely, synaptogenesis. Polymorphisms in the human M6a geneGPM6Ahave recently been associated with mental illnesses such asschizophrenia, bipolar disorders, and claustrophobia. Nevertheless, the molecular bases underlying these observations remain unknown. We have previously documented that, to induce filopodia formation, M6a depends on the association of membrane lipid microdomains and the activation of Src and mitogen-activated protein kinase kinases. Here, in silico analysis of the phosphorylation of tyrosine 251 (Y251) at the C-terminus of M6a showed that it could be a target of Src kinases. We examined whether phosphorylation of M6a at Y251 affects neurite and filopodia outgrowth and the targets involved in its signal propagation. This work provides evidence that the Src kinase family and the phosphatidylinositide 3-kinase (PI3K), but not Ras, participate in M6a signal cascade leading to neurite/filopodia outgrowth in hippocampal neurons and murine neuroblastoma N2a cells. Phosphorylation of M6a at Y251 is essential only for neurite outgrowth by the PI3K/AKT-mediated pathway and, moreover, rescues the inhibition caused by selective Src inhibitor and external M6a monoclonal antibody treatment. Thus, we suggest that phosphorylation of M6a at Y251 is critical for a specific stage of neuronal development and triggers redundant signaling pathways leading to neurite extension. |
| SCZ Keywords | schizophrenia |