Abstract:
:In recent decades, many genome-wide association studies on insomnia have reported numerous genes harboring multiple risk variants. Nevertheless, the molecular functions of these risk variants conveying risk to insomnia are still ill-studied. In the present study, we integrated GWAS summary statistics (N=386,533) with two independent brain expression quantitative trait loci (eQTL) datasets (N=329) to determine whether expression-associated SNPs convey risk to insomnia. Furthermore, we applied numerous bioinformatics analyses to highlight promising genes associated with insomnia risk. By using Sherlock integrative analysis, we detected 449 significant insomnia-associated genes in the discovery stage. These identified genes were significantly overrepresented in six biological pathways including Huntington's disease (P=5.58 × 10-5), Alzheimer's disease (P=5.58 × 10-5), Parkinson's disease (P=6.34 × 10-5), spliceosome (P=1.17 × 10-4), oxidative phosphorylation (P=1.09 × 10-4), and wnt signaling pathways (P=2.07 × 10-4). Further, five of these identified genes were replicated in an independent brain eQTL dataset. Through a PPI network analysis, we found that there existed highly functional interactions among these five identified genes. Three genes of LDHA (P=0.044), DALRD3 (P=5.0 × 10-5), and HEBP2 (P=0.032) showed significantly lower expression level in brain tissues of insomnic patients than that in controls. In addition, the expression levels of these five genes showed prominently dynamic changes across different time points between behavioral states of sleep and sleep deprivation in mice brain cortex. Together, the evidence of the present study strongly suggested that these five identified genes may represent candidate genes and contributed risk to the etiology of insomnia.
journal_name
Biosci Repjournal_title
Bioscience reportsauthors
Sun H,Zhang J,Ma Y,Liu Jdoi
10.1042/BSR20201084subject
Has Abstractpub_date
2020-09-30 00:00:00issue
9eissn
0144-8463issn
1573-4935pii
226183journal_volume
40pub_type
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