| Maple Syrup Urine Disease |
| Geno
|
Mag
|
Summary
|
| (C;C)
|
5
|
Maple syrup urine disease
|
| (C;G)
|
2.5
|
carrier for Maple Syrup Urine disease
|
| (G;G)
|
0
|
normal
|
rs28934895, also known as R183P, is a mutation (rare SNP) in the branched chain keto acid dehydrogenase E1, beta polypeptide BCKDHB gene. The common allele is rs28934895(G), encoding arginine (R) at amino acid position 183.
With a frequency of about 1 in 100 among Jews of European descent, the much rarer rs28934895(C) allele encodes a proline (P), and it is the most frequent mutation leading to Maple Syrup Urine Disease, accounting for perhaps 90% of the mutations in this population group. However, by itself the mutation does not predict the severity of the disease; note also that only homozygotes (rs28934895(C;C)) are at risk for the disease.[PMID 11509994
]
This SNP is often included in screening panels for carriers of deleterious mutations among Ashkenazi Jews, such as carrier screens for prospective parental couples.
Note also that 23andMe uses a different name for this SNP; in their terminology, rs28934895 is called i3002808.
]
