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Congenital macrothrombocytopenia is a heterogeneous disorder in India

Ali, S.; Ghosh, K.; Daly, M. E.; Hampshire, D. J.; Makris, M.; Ghosh, M.; Mukherjee, L.; Bhattacharya, M.; Shetty, S.


S. Ali

K. Ghosh

M. E. Daly

M. Makris

M. Ghosh

L. Mukherjee

M. Bhattacharya

S. Shetty


Introduction: Inherited macrothrombocytopenia represents a heterogeneous group of disorders which are characterized by the presence of a reduced number of abnormally large platelets in the circulation, which may or may not be associated with a bleeding tendency. In spite of several causative genes having been identified, the underlying genetic defects remain to be identified in approximately half of the cases. Aims: To understand the molecular pathology of isolated giant platelet disorder from India. Materials and methods: We studied 112 cases that were referred for investigation of macrothrombocytopenia. Agonist induced platelet aggregation and platelet GP1b/IX/V receptor expression were investigated to assess GP1b/IX/V receptor expression and the GP1BA, GP1BB, GP9, ABCG5, ABCG8, TUBB1 and MYH9 genes were analysed to identify candidate gene defects. Results: Twenty-three candidate gene defects were identified in 48 of 112 cases, 20 of which were novel. Of the candidate defects identified, 91% were missense and 9% were nonsense variations. The missense variations were in GP9 (9), ABCG5 (4), GP1BB (3), GP1BA (3) and MYH9 (2), while the nonsense defects occurred in MYH9 (1) and GP1BA (1). Conclusions: This study increases the understanding of the molecular basis of an isolated giant platelet disorder, a common heterogeneous condition prevalent in north and eastern India.


Ali, S., Ghosh, K., Daly, M. E., Hampshire, D. J., Makris, M., Ghosh, M., …Shetty, S. (2016). Congenital macrothrombocytopenia is a heterogeneous disorder in India. Haemophilia, 22(4), 570-582.

Journal Article Type Article
Acceptance Date Jan 11, 2016
Online Publication Date Jun 13, 2016
Publication Date 2016-07
Deposit Date Apr 10, 2019
Journal Haemophilia
Print ISSN 1351-8216
Electronic ISSN 1365-2516
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 22
Issue 4
Pages 570-582
Keywords Giant platelet disorder; GP1b/IX/V complex; Macrothrombocytopenia; MYH9; Thrombocytopenia
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