|(A;G)||3||5x higher risk for Parkinson's; Carrier of Gaucher disease allele|
|(G;G)||6||Gaucher disease; at least 5x higher risk of Parkinson's|
rs421016, also known as L444P or Leu444Pro, is a SNP causing an amino acid change in the GBA gene; it is among the most common mutations associated with Gaucher disease of any type. [PMID 3353383] Amino acid predictions from genome sequence may predict this as L483P or Leu483Pro; this disparity in position calling may be due to a 39 peptide signal sequence. Polyphen 2 predicts P04062 L483P to be "possibly damaging" with a score of 0.857 (sensitivity: 0.83; specificity: 0.93). (P04062 is the uniprot ID for GBA.)
The risk allele (in current dbSNP orientation) is (G), and as the inheritance is autosomal recessive, individuals must either be compound heterozygotes (for two different GBA mutations) or rs421016(G;G) homozygotes to develop Gaucher disease. There are over 300 mutations now known to occur in the GBA gene, with many associated with increasing risk for either type I, II, or III Gaucher disease.
Note: this SNP used to have a "mirror" SNP, rs35095275, representing the opposite strand yet the same exact nucleotide position; it has now been merged into this SNP.
One copy of rs421016(G) has also been shown to increase the risk of Parkinson's disease ~5 fold across multiple ethnicities, and to lower a bit the age of onset of Parkinson's.[PMID 19846850] In one study, the estimated age-specific risk for Parkinson's disease at 60 and 80 years of age was 4.7% and 9.1% among Gaucher disease patients, i.e. those carrying two Gaucher GBA mutations, compared with 1.5% and 7.7% among GBA mutation heterozygotes, and 0.7% and 2.1% for carriers of zero Gaucher GBA mutations, respectively. Note that these risks are pooled over multiple GBA mutations including rs421016 as well as other GBA variants.[PMID 24756352]
|Disease||Acute neuronopathic Gaucher's disease Subacute neuronopathic Gaucher's disease Gaucher's disease Parkinson disease Dementia Gaucher disease Gaucher disease|
|CLNDBN||Acute neuronopathic Gaucher's disease Subacute neuronopathic Gaucher's disease Gaucher's disease, type 1 Parkinson disease, late-onset Dementia, Lewy body, susceptibility to Gaucher disease, perinatal lethal Gaucher disease|
|CLNSRC||HGMD OMIM Allelic Variant|
|CLNACC||RCV000004509.8, RCV000004510.9, RCV000004511.8, RCV000004512.7, RCV000004513.7, RCV000004533.4, RCV000004534.4, RCV000004535.4, RCV000004536.4, RCV000020150.1, RCV000225393.1, RCV000225500.1,|
[PMID 2309702] Genotype assignment in Gaucher disease by selective amplification of the active glucocerebrosidase gene.
[PMID 2349952] Complex alleles of the acid beta-glucosidase gene in Gaucher disease.
[PMID 2464926] Characterization of mutations in Gaucher patients by cDNA cloning.
[PMID 2880291] A mutation in the human glucocerebrosidase gene in neuronopathic Gaucher's disease.