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lüll The genetics of normal platelet reactivity Kunicki TJ; Nugent DJBlood 2010[Oct]; 116 (15): 2627-34Genetic and environmental factors contribute to a substantial variation in platelet function seen among normal persons. Candidate gene association studies represent a valiant effort to define the genetic component in an era where genetic tools were limited, but the single nucleotide polymorphisms identified in those studies need to be validated by more objective, comprehensive approaches, such as genome-wide association studies (GWASs) of quantitative functional traits in much larger cohorts of more carefully selected normal subjects. During the past year, platelet count and mean platelet volume, which indirectly affect platelet function, were the subjects of GWAS. The majority of the GWAS signals were located to noncoding regions, a consistent outcome of all GWAS to date, suggesting a major role for mechanisms that alter phenotype at the level of transcription or posttranscriptional modifications. Of 15 quantitative trait loci associated with mean platelet volume and platelet count, one located at 12q24 is also a risk locus for coronary artery disease. In most cases, the effect sizes of individual quantitative trait loci are admittedly small, but the results of these studies have led to new insight into regulators of hematopoiesis and megakaryopoiesis that would otherwise be unapparent and difficult to define.|Blood Platelets/cytology/*physiology[MESH]|Cell Size[MESH]|Chromosomes, Human, Pair 12/genetics[MESH]|Coronary Artery Disease/blood/genetics[MESH]|Genome-Wide Association Study/*methods[MESH]|Genomics[MESH]|Humans[MESH]|Platelet Aggregation/genetics[MESH]|Platelet Count[MESH]|Platelet Function Tests[MESH]|Polymorphism, Single Nucleotide[MESH]|Quantitative Trait Loci[MESH]|Risk Factors[MESH]|Thrombopoiesis/genetics[MESH] |