Bernard-Soulier syndrome, type A2, autosomal dominant

Bernard-Soulier syndrome, type A2, is an inherited bleeding disorder affecting platelet function and size. It is characterized by a mild to moderate bleeding tendency, which includes symptoms such as prolonged bleeding after dental extractions and heavy menstrual bleeding. The condition arises from heterozygous mutations in the GP1BA gene and follows an autosomal dominant pattern of inheritance. Although precise prevalence data is not available, the disorder is recognized through its characteristic laboratory findings and clinical presentation.

Individuals with Bernard-Soulier syndrome, type A2 typically present with a range of bleeding symptoms. Characteristic clinical features include menorrhagia, increased mean platelet volume, impaired ristocetin-induced platelet aggregation, prolonged bleeding after dental procedures, and thrombocytopenia, with epistaxis noted in a subset of patients. These findings are often central to the diagnosis, and while many of the features are consistently observed, not all individuals experience every symptom and the severity can vary considerably.

The condition is caused by heterozygous mutations in the GP1BA gene, which plays an essential role in platelet adhesion and aggregation. Being inherited in an autosomal dominant manner means that a single copy of the altered gene is sufficient to cause the disorder. Although many features are commonly observed, there can be variable expressivity, with some individuals experiencing a milder bleeding tendency than others. Families are encouraged to seek genetic counseling to discuss inheritance patterns and implications for family planning. Associated genes include GP1BA.