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Table 3 Potential genetic risk factors for dementia with Lewy bodies (DLB) and Parkinson’s disease dementia (PDD)

From: Are dementia with Lewy bodies and Parkinson’s disease dementia the same disease?

GBA (glucocerebrosidase) Mutations are most prevalent risk factors for sporadic DLB [271, 272]; associated with increased levels of AD pathology [183, 273]. Mutations associated with risk of PDD and agressive cognitive decline [274,275,276,277,278,279,280,281,282,283].
MAPT (microtubule-associated protein tau) H1 haplotype Associated with increased risk of DLB [284]. Strongly associated with dementia in PD [153, 275, 285,286,287,288,289].
APOE (apolipoprotein E) APOE ε4 is overrepresented in DLB, and it is an increased risk for DLB [35, 290]. Mixed evidence for dementia risk in PD [291,292,293,294,295,296,297].
SNCA (α-synuclein) Multiplication is not a common cause of DLB [298, 299] Rare multiplications and mutations are associated with dementia in monogenic PD [292, 300], but show phenotypic variations and clinical heterogeneity [301,302,303,304,305,306].
COMT (catechol-O-methyltransferase)   No evidence for dementia risk [287, 288, 307,308,309], but polymorphisms may contribute to cognitive deficits in PD [310].
UBQLN1 (ubiquilin-1) and FMR1 (fragile X mental retardation protein 1) No association with cognitive impairment [311, 312].
LRRK2 (leucine-rich repeat serine/threonine-protein kinase 2) Not essential for DLB [313]. No association with PDD [314,315,316,317,318,319,320,321,322].
C9orf72 repeat expansion Not related with DLB [313].  
RAB39B (Ras-related protein Rab-39B) mutations Not related with DLB [323].  
  1. AD: Alzheimer’s disease, PD: Parkinson’s disease