Researchers from the Icahn School of Medicine at Mount Sinai have published the first study of its kind in the field of addiction genetics using a multi-omics approach to provide a large list of causal candidate genes associated with alcohol consumption and alcohol use disorder (AUD). The study also shows a potential link between alcoholism, Alzheimer’s disease, and other neurodegenerative disorders. The findings were published August 20 in Nature Communications.
Alcohol use disorders are complex, moderately heritable, psychiatric disorders associated with heightened morbidity and mortality. While previous studies have identified loci (genetic regions) associated with alcohol consumption, this study aimed to identify the variants and genes themselves. “Identification of causal variants and genes underlying genome-wide association study (GWAS) loci is essential to understand the biology of alcohol use disorder and to improve its treatment,” said first and co-corresponding author, Manav Kapoor. Ph.D., an Assistant Professor of Neuroscience and Genetics and Genomics at Mount Sinai at the time of the study.
To identify genes relevant to AUD and drinks per week (DPW), a measure used to evaluate alcohol consumption, the research team integrated multi-omics data, using Mendelian Randomization-based methods on the largest available transcriptomic and epigenomic data from brain tissues and myeloid cells. Using data derived from these tissues, the team fine mapped complex loci and identified likely variants and candidate genes, including SPI1 and MAPT genes, associated with alcoholism. SPI1 and MAPT have also been found to be associated with susceptibility for other psychiatric and neurodegenerative disorders including depression and Alzheimer’s disease.
SPI1 (Spi-1 Proto-Oncogene) encodes an ETS-domain transcription factor (PU.1) that regulates gene expression during myeloid and B-lymphoid cell development and homeostasis. Given SPI1’s control over expression of several downstream genes, this gene may be a major reason for enrichment of immune pathways in drinking behaviors, as observed in past transcriptomic analysis of human and animal brains.
The MAPT gene analyzed in the study encodes the tau protein, which is known for its role in central nervous system disorders such as Alzheimer’s disease, frontotemporal dementia, Parkinson’s disease, and other neurodegenerative disorders known as tauopathies.
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