Macrothrombocytopenia (MTP) is a heterogeneous group of disorders characterized by enlarged and reduced numbers of circulating platelets, sometimes resulting in abnormal bleeding. The clinical presentations of MTP-affected individuals vary considerably and range from no symptoms to a severe bleeding tendency. MTP-causing mutations have been reported in several genes, involved in various functions such as cell signaling, cytoskeleton organization, and gene expression. Among these, the most common is MYH9, which is responsible for MYH9-related disease. The second most common are GP1BA, GP1BB, and GP, which are responsible for Bernard-Soulier syndrome.
Human diseases [BR:
Human diseases in ICD-11 classification [BR:
03 Diseases of the blood or blood-forming organs
Coagulation defects, purpura or other haemorrhagic or related conditions
Hematopoietic cell lineage
Regulation of actin cytoskeleton
PI3K-Akt signaling pathway
Bernard-Soulier syndrome, and
Bleeding disorder platelet-type.
Favier R, Raslova H
Progress in understanding the diagnosis and molecular genetics of macrothrombocytopenias.
Br J Haematol 170:626-39 (2015)
Kunishima S, Okuno Y, Yoshida K, Shiraishi Y, Sanada M, Muramatsu H, Chiba K, Tanaka H, Miyazaki K, Sakai M, Ohtake M, Kobayashi R, Iguchi A, Niimi G, Otsu M, Takahashi Y, Miyano S, Saito H, Kojima S, Ogawa S
ACTN1 mutations cause congenital macrothrombocytopenia.
Am J Hum Genet 92:431-8 (2013)
Stritt S, Nurden P, Turro E, Greene D, Jansen SB, Westbury SK, Petersen R, Astle WJ, Marlin S, Bariana TK, Kostadima M, Lentaigne C, Maiwald S, Papadia S, Kelly AM, Stephens JC, Penkett CJ, Ashford S, Tuna S, Austin S, Bakchoul T, Collins P, Favier R, Lambert MP, Mathias M, Millar CM, Mapeta R, Perry DJ, Schulman S, Simeoni I, Thys C, Gomez K, Erber WN, Stirrups K, Rendon A, Bradley JR, van Geet C, Raymond FL, Laffan MA, Nurden AT, Nieswandt B, Richardson S, Freson K, Ouwehand WH, Mumford AD
A gain-of-function variant in DIAPH1 causes dominant macrothrombocytopenia and hearing loss.
Blood 127:2903-14 (2016)
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