Sheeza Basharat
Sheeza Basharat2 months ago
Your Blood Type May Affect Your Risk of an Early Stroke

Your Blood Type May Affect Your Risk of an Early Stroke

People with one of the type A blood groups appear to be more likely to have a stroke before the age of 60 compared with people with other blood types, according to a 2022 study. Blood types describe the rich variety of chemicals displayed on the surface of our red blood cells. Among the most familiar are those named A and B, which can be present together as AB, individually as A or B, or not present at all, as O. Even within these major blood types, there are subtle variations arising from mutations in the genes responsible. Now, genomic research has uncovered a clear relationship between the gene for the A1 subgroup and early-onset stroke. Researchers compiled data from 48 genetic studies, which included roughly 17,000 people with a stroke and nearly 600,000 non-stroke controls. All participants were between 18 and 59 years of age. A genome-wide search revealed two locations strongly associated with an earlier risk of stroke. One coincided with the spot where genes for blood type sit. A second analysis of specific types of blood-type genes found people whose genome coded for a variation of the A group had a 16 percent higher chance of a stroke before the age of 60, compared with a population of other blood types. For those with a gene for group O1, the risk was lower by 12 percent. The researchers note, however, that the additional risk of stroke in people with type A blood is small, so there is no need for extra vigilance or screening in this group. "We still don't know why blood type A would confer a higher risk," said senior author and vascular neurologist Steven Kittner from the University of Maryland said in a 2022 statement. "But it likely has something to do with blood-clotting factors like platelets and cells that line the blood vessels as well as other circulating proteins, all of which play a role in the development of blood clots." Strokes in younger people are less likely to be caused by a build-up of fatty deposits in the arteries (a process called atherosclerosis) and more likely to be caused by factors to do with clot formation, the authors say. The study also found that people with type B blood were around 11 percent more likely to have a stroke compared to non-stroke controls, regardless of their age. Previous studies suggest that the part of the genome that codes for blood type, called the 'ABO locus', is associated with coronary artery calcification, which restricts blood flow, and heart attack. The genetic sequence for A and B blood types has also been associated with a slightly higher risk of blood clots in veins, called venous thrombosis.

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