Search results
Results from the WOW.Com Content Network
Alcohol flush reaction is a condition that is experienced more frequently by people of East Asian descent, giving rise to names such as "Asian flush" or "Asian glow". [citation needed] Genotype frequency distribution of ALDH2 (rs671).
These symptoms are indicative of a medical condition known as the alcohol flush reaction, also known as “Asian flush” or “Oriental flushing syndrome”. [8] There is a mutant form of aldehyde dehydrogenase, termed ALDH2*2, wherein a lysine residue replaces a glutamate in the active site at position 487 of ALDH2. [9]
The cited allergic reaction-like symptoms: (a) do not appear due to classical IgE or T cell-related allergen-induced reactions but rather the actions of acetaldehyde in stimulating the release of histamine, a probable mediating cause of these symptoms; (b) typically occur within 30–60 minutes of ingesting alcoholic beverages; and (c) occur in ...
ALDH2 pictured on the left, is an enzyme which breaks down acetaldehyde. [20] [21] Regions highlighted in yellow are structural and allow ALDH2 to fold properly. [20] [21] The region highlighted in red can vary between individuals (right). [22] Individuals who have a G in their DNA will have normal folding and function of ALDH2. [20]
ALDH2, which has a lower K M for acetaldehydes than ALDH1 and acts predominantly in the mitochondrial matrix, is the main enzyme in acetaldehyde metabolism and has three genotypes. A single point mutation (G → A) at exon 12 of the ALDH2 gene causes a replacement of glutamate with lysine at residue 487, resulting in the ALDH2K enzyme. [8]
For premium support please call: 800-290-4726 more ways to reach us
ALDH2*1 is a common allele , but about 40% of people of East Asian ethnicity have one or two copies of the dominant ALDH2*2 instead, which causes ALDH2 deficiency. If deficient people drink ethanol, they suffer from alcohol flush reaction due to acetaldehyde accumulation. [3] Four Alda-1 molecules bind to each monomer of ALDH2 tetramer.
Alcohol-induced asthma reactions among Asians has been most thoroughly studied in those of native Japanese descent. In such individuals, the ingestion of virtually any alcoholic beverage or pure ethanol and, in some cases, the smelling of ethanol fumes may be followed, typically within 1–30 minutes, by one or more of the following symptoms: an alcohol flush reaction (i.e. the "Asian flush ...