Nguyen, T.D.* ; Harder, A.* ; Xiong, Y.* ; Kowalec, K.* ; Hägg, S.* ; Cai, N. ; Kuja-Halkola, R.* ; Dalman, C.* ; Sullivan, P.F.* ; Lu, Y.*
     
    
        
Genetic heterogeneity and subtypes of major depression.
    
    
        
    
    
        
        Mol. Psychiatry 27, 1667–1675 (2022)
    
    
    
      
      
	
	    Major depression (MD) is a heterogeneous disorder; however, the extent to which genetic factors distinguish MD patient subgroups (genetic heterogeneity) remains uncertain. This study sought evidence for genetic heterogeneity in MD. Using UK Biobank cohort, the authors defined 16 MD subtypes within eight comparison groups (vegetative symptoms, symptom severity, comorbid anxiety disorder, age at onset, recurrence, suicidality, impairment, and postpartum depression; N ~ 3000-47000). To compare genetic component of these subtypes, subtype-specific genome-wide association studies were performed to estimate SNP-heritability, and genetic correlations within subtype comparison and with other related disorders/traits. The findings indicated that MD subtypes were divergent in their SNP-heritability, and genetic correlations both within subtype comparisons and with other related disorders/traits. Three subtype comparisons (vegetative symptoms, age at onset, and impairment) showed significant differences in SNP-heritability; while genetic correlations within subtype comparisons ranged from 0.55 to 0.86, suggesting genetic profiles are only partially shared among MD subtypes. Furthermore, subtypes that are more clinically challenging, e.g., early-onset, recurrent, suicidal, more severely impaired, had stronger genetic correlations with other psychiatric disorders. MD with atypical-like features showed a positive genetic correlation (+0.40) with BMI while a negative correlation (-0.09) was found in those without atypical-like features. Novel genomic loci with subtype-specific effects were identified. These results provide the most comprehensive evidence to date for genetic heterogeneity within MD, and suggest that the phenotypic complexity of MD can be effectively reduced by studying the subtypes which share partially distinct etiologies.
	
	
	    
	
       
      
	
	    
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        Publication type
        Article: Journal article
    
 
    
        Document type
        Scientific Article
    
 
    
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        Keywords
        Genome-wide Association; Stratification; Heritability; Resource
    
 
    
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        Language
        english
    
 
    
        Publication Year
        2022
    
 
    
        Prepublished in Year
        
    
 
    
        HGF-reported in Year
        2022
    
 
    
    
        ISSN (print) / ISBN
        1359-4184
    
 
    
        e-ISSN
        1476-5578
    
 
    
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	    Volume: 27,  
	    Issue: ,  
	    Pages: 1667–1675 
	    Article Number: ,  
	    Supplement: ,  
	
    
 
    
        
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            Publisher
            Nature Publishing Group
        
 
        
            Publishing Place
            Campus, 4 Crinan St, London, N1 9xw, England
        
 
	
        
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        Reviewing status
        Peer reviewed
    
 
    
        Institute(s)
        Helmholtz Pioneer Campus (HPC)
    
 
    
        POF-Topic(s)
        30202 - Environmental Health
    
 
    
        Research field(s)
        Pioneer Campus
    
 
    
        PSP Element(s)
        G-510007-001
    
 
    
        Grants
        Vetenskapsrådet (Swedish Research Council)
NIMH NIH HHS
    
 
    
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        Erfassungsdatum
        2022-02-07