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Bernard Soulier syndrome (BSS) is an inherited platelet disorder characterized by mild to severe bleeding tendency, macrothrombocytopenia and absent ristocetin-induced platelet agglutination.
Features include always present findings: Impaired ristocetin-induced platelet aggregation and Low platelet count (thrombocytopenia); and very common findings: Abnormal bleeding tendency (abnormal bleeding), Macrothrombocytopenia, Giant platelets, and Decreased platelet glycoprotein Ib-IX-V. 25 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Blood and immune system | 9 | Abnormal bleeding tendency (abnormal bleeding), Prolonged bleeding time, Impaired ristocetin-induced platelet aggregation |
Kidneys and urinary system | 2 | Macroscopic hematuria, Partially duplicated kidney |
Brain and nerves | 2 | Seizure, Migraine |
Digestive system | 1 | Gastrointestinal hemorrhage |
Lungs and breathing | 1 | Asthma |
Age of onset: at birth.
GP1BA encodes glycoprotein Ib platelet subunit alpha (652 aa). GP-Ib, a surface membrane protein of platelets, participates in the formation of platelet plugs by binding to the A1 domain of vWF, which is already bound to the subendothelium Highest expression in Skin Sun Exposed Lower leg (4.2 TPM) and Skin Not Sun Exposed Suprapubic (4.0 TPM).
Bernard-Soulier syndrome is caused by mutations in the GP1BA gene on chromosome 17.
The GP1BA protein participates in GP1BA variant:GP1BB:GP9, GP1BA variant:GP1BB:GP9:GP5, and RUNX1:CBFB:SIN3A,(SIN3B):PRMT6:HDAC1:GP1BA gene:H3K4me2-Nucleosome pathways.
GP1BA is classified as a druggable target (Cell Surface, Druggable Genome, and External Side Of Plasma Membrane categories) with score 4.7.
GP1BB encodes glycoprotein Ib platelet subunit beta (206 aa). Gp-Ib, a surface membrane protein of platelets, participates in the formation of platelet plugs by binding to von Willebrand factor, which is already bound to the subendothelium
Bernard-Soulier syndrome is caused by mutations in the GP1BB gene on chromosome 22.
GP1BB is classified as a druggable target (Druggable Genome category) with score 0.0.
GP9 encodes glycoprotein IX platelet (177 aa). The GPIb-V-IX complex functions as the vWF receptor and mediates vWF-dependent platelet adhesion to blood vessels. Highest expression in Whole Blood (21.5 TPM) and Spleen (12.6 TPM).
Bernard-Soulier syndrome is caused by mutations in the GP9 gene on chromosome 3.
The GP9 protein participates in TLR folding by chaperones GP96 and CNPY3 pathway.
GP9 is classified as a druggable target (Druggable Genome category) with score 0.0.
Genetic testing for GP1BA, GP1BB, GP9 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Bernard-Soulier syndrome has been reported in the published literature.
No approved treatments are currently available for Bernard-Soulier syndrome. An additional 3 compounds hold orphan drug designation.
While no drugs are FDA-approved specifically for Bernard-Soulier syndrome, some of the following designated compounds may be used off-label in clinical practice. Treatment decisions should be made in consultation with a specialist familiar with this condition.
The following drugs have received orphan drug designation from the FDA for Bernard-Soulier syndrome. Orphan designation reflects regulatory interest and does not indicate approval for treatment.
Brand Name | Generic Name | Sponsor | Designated | Exclusivity End | Designation Status |
|---|---|---|---|---|---|
induced pluripotent stem cell (iPSC)-derived platelet injection | induced pluripotent stem cell (iPSC)-derived platelet injection | HemaCell Biotechnology Inc. | 2025 | — | Designated |
platelets produced in vitro from proplatelets derived from peripheral blood | platelets produced in vitro from proplatelets derived from peripheral blood | HemaCell Biotechnology Inc. | 2025 | — | Designated |
umbilical cord blood derived megakaryocyte injection | umbilical cord blood derived megakaryocyte injection | HemaCell Biotechnology Inc. | 2025 | — | Designated |
Gene therapy approaches for Bernard-Soulier syndrome have been reported in the published literature.
View trials for Bernard-Soulier syndrome
Phenotype severity distribution: 2 always present features, 4 very common features, 6 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Bernard-Soulier syndrome.
46 publications have been identified in PubMed for Bernard-Soulier syndrome. Research spans Case Report / Case Series (41%), Diagnostic / Biomarker (17%), and Basic Science / Preclinical (17%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 19 | 41% |
Testing and diagnosis research | 8 | 17% |
Laboratory research | 8 | 17% |
Disease patterns and progression | 7 | 15% |
Research summaries | 3 | 7% |
New treatment approaches | 1 | 2% |
Touré SA (2026). [PMID: 41630424](https://pubmed.ncbi.nlm.nih.gov/41630424/). *Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis*. [Epidemiology / Natural History]
Zibara V (2026). [PMID: 41874099](https://pubmed.ncbi.nlm.nih.gov/41874099/). *Hematol Rep*. [Review / Meta-Analysis]
Citla-Sridhar D (2026). [PMID: 42154520](https://pubmed.ncbi.nlm.nih.gov/42154520/). *J Pediatr Hematol Oncol*. [Epidemiology / Natural History]
Jannat M (2026). [PMID: 41853404](https://pubmed.ncbi.nlm.nih.gov/41853404/). *Cureus*. [Case Report / Case Series]
Ghodratnia E (2026). [PMID: 42229093](https://pubmed.ncbi.nlm.nih.gov/42229093/). *Transfus Apher Sci*. [Basic Science / Preclinical]
Yaghoubi M (2026). [PMID: 41669701](https://pubmed.ncbi.nlm.nih.gov/41669701/). *Clinical case reports*. [Case Report / Case Series]
Hayward CPM (2026). [PMID: 41968845](https://pubmed.ncbi.nlm.nih.gov/41968845/). *Int J Lab Hematol*. [Review / Meta-Analysis]
Salem ML (2026). [PMID: 41566116](https://pubmed.ncbi.nlm.nih.gov/41566116/). *Molecular genetics & genomic medicine*. [Gene Therapy / Novel Therapeutics]
Okamoto Y (2026). [PMID: 41746364](https://pubmed.ncbi.nlm.nih.gov/41746364/). *Annals of hematology*. [Case Report / Case Series]
Ferrari S (2026). [PMID: 41731342](https://pubmed.ncbi.nlm.nih.gov/41731342/). *International journal of laboratory hematology*. [Epidemiology / Natural History]
Data assembled from 8 of 12 sources · Last updated Sep 19, 2026, 6:55 PM UTC
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AI-curated news mentioning Bernard-Soulier syndrome
Updated Jul 21, 2026
FDA approved Casgevy CRISPR gene therapy for children as young as 2 with sickle cell disease on July 1, 2026. Here's what families need to know about this milestone. Approximately 5,500 additional American children are now eligible for this established one-time therapy, according to Vertex Pharmaceuticals, Casgevy's developer. Casgevy also covers transfusion-dependent beta-thalassemia in this new age indication. Sickle cell disease is a lifelong inherited blood disorder that warps red blood cells into stiff, crescent shapes that can block blood flow, starving organs and tissues of oxygen. The world's first CRISPR-based gene therapy has been approved for children as young as two years old, opening the possibility of a single, potentially curative treatment to thousands of American children with sickle cell disease before years of organ damage can narrow what medicine can do for them. Families with children aged 2 and older who have sickle cell disease should speak with their pediatric hematologist about whether Casgevy is appropriate to consider at this stage of their child's disease. Ask specifically which authorized treatment centers perform Casgevy in your region. Treatment is available only at specialized sites, and geographic access remains limited. Contact your child's insurance plan or Medicaid office to ask about coverage. Medicaid coverage for gene therapies varies by state, and some states have developed outcomes-based payment models for high-cost therapies. "With today's decision, pediatric patients as young as 2 years of age can now access a critical additional treatment option to treat these debilitating, life-threatening diseases," said Karim Mikhail, acting director of the Office of Therapeutic Products at the FDA's Center for Biologics Evaluation and Research, according to the FDA press announcement. Casgevy is a non-viral, ex vivo CRISPR/Cas9 gene-edited cell therapy.