The genetic architecture of psychiatric disorders has seen significant progress in the past five years, with new insights into the genetic basis of nine major disorders, including Alzheimer's disease, attention-deficit hyperactivity disorder, alcohol dependence, anorexia nervosa, autism spectrum disorder, bipolar disorder, major depressive disorder, nicotine dependence, and schizophrenia. Empirical studies have identified new hypotheses about the etiology of these conditions and provided data on their genetic architectures, which have implications for future research strategies. These findings, derived from genome-wide association studies (GWAS), structural variation (SV) studies, and sequencing, meet community standards for significance and replication in human genetics. For Alzheimer's disease, rare variations such as mutations in APP, PSEN1, and PSEN2 have been identified, and common variations like APOE have been implicated in late-onset AD. Pathway analyses suggest that cholesterol metabolism and the innate immune response are involved in AD. For bipolar disorder and schizophrenia, rare and common variations have been identified, with some loci showing strong associations. For autism spectrum disorder, rare exonic mutations and structural variations have been found, and common variations are also implicated. For alcohol and nicotine dependence, common variations such as ALDH2 and AUTS2 have been identified, and pathway analyses suggest roles for nicotinic receptor genes. The genetic architecture of these disorders is complex, involving both rare and common variations. These findings support the idea that psychiatric disorders are polygenic, with many genes involved in their etiology. The results also suggest that the "missing heritability" is hidden and imperfectly assayed by current genotyping technologies. The implications of these findings are significant for future research, including the need for larger studies, more comprehensive genomic evaluations, and the development of innovative methods to understand the genetic basis of these disorders. The results also highlight the importance of statistical rigor in psychiatric genetics to avoid false positives and ensure the validity of findings. Overall, the genetic architecture of psychiatric disorders is a complex and multifaceted area of research that requires continued investigation and collaboration.The genetic architecture of psychiatric disorders has seen significant progress in the past five years, with new insights into the genetic basis of nine major disorders, including Alzheimer's disease, attention-deficit hyperactivity disorder, alcohol dependence, anorexia nervosa, autism spectrum disorder, bipolar disorder, major depressive disorder, nicotine dependence, and schizophrenia. Empirical studies have identified new hypotheses about the etiology of these conditions and provided data on their genetic architectures, which have implications for future research strategies. These findings, derived from genome-wide association studies (GWAS), structural variation (SV) studies, and sequencing, meet community standards for significance and replication in human genetics. For Alzheimer's disease, rare variations such as mutations in APP, PSEN1, and PSEN2 have been identified, and common variations like APOE have been implicated in late-onset AD. Pathway analyses suggest that cholesterol metabolism and the innate immune response are involved in AD. For bipolar disorder and schizophrenia, rare and common variations have been identified, with some loci showing strong associations. For autism spectrum disorder, rare exonic mutations and structural variations have been found, and common variations are also implicated. For alcohol and nicotine dependence, common variations such as ALDH2 and AUTS2 have been identified, and pathway analyses suggest roles for nicotinic receptor genes. The genetic architecture of these disorders is complex, involving both rare and common variations. These findings support the idea that psychiatric disorders are polygenic, with many genes involved in their etiology. The results also suggest that the "missing heritability" is hidden and imperfectly assayed by current genotyping technologies. The implications of these findings are significant for future research, including the need for larger studies, more comprehensive genomic evaluations, and the development of innovative methods to understand the genetic basis of these disorders. The results also highlight the importance of statistical rigor in psychiatric genetics to avoid false positives and ensure the validity of findings. Overall, the genetic architecture of psychiatric disorders is a complex and multifaceted area of research that requires continued investigation and collaboration.