G2Cdb::Allele report

Mutation type

Altered genes (1)

Gene Symbol Species Description
G00002004 MYH9 Homo sapiens myosin, heavy chain 9, non-muscle

Diseases (1)

Disease Description Nervous effect
D00000134 MYH9-related disease N

Literature (1)

Pubmed - human_disease

  • First description of somatic mosaicism in MYH9 disorders.

    Kunishima S, Matsushita T, Yoshihara T, Nakase Y, Yokoi K, Hamaguchi M and Saito H

    Department of Haemostasis and Thrombosis, Clinical Research Centre, National Hospital Organization Nagoya Medical Centre, Nagoya, Japan. kunishis@nnh.hosp.go.jp

    MYH9 disorders are characterized by giant platelets, thrombocytopenia, and Dohle body-like cytoplasmic granulocyte inclusion bodies that result from mutations in MYH9, which encodes non-muscle myosin heavy chain-A (NMMHCA). These disorders are known to be transmitted in an autosomal dominant manner, although about 20% of cases are considered to be sporadic. We report here the first case of a MYH9 disorder because of somatic mosaicism. The patient was the father of a male with typical May-Hegglin anomaly. The father had normal platelet counts, however, both normal-sized and giant platelets were observed on his peripheral blood smears. In addition, 14% of neutrophils contained inclusion bodies and the rest showed a normal morphology. Quantitative fluorescent polymerase chain reaction analysis showed that only 6% of DNA from peripheral blood leucocytes harboured the mutation. The mosaicism was demonstrated at a similar rate in different tissues, buccal mucosa cells and hair bulb cells, implying that the mutation had occurred before gastrulation. Mosaicism might account for some de novo mutations in MYH9 disorders.

    British journal of haematology 2005;128;3;360-5

© G2C 2014. The Genes to Cognition Programme received funding from The Wellcome Trust and the EU FP7 Framework Programmes:
EUROSPIN (FP7-HEALTH-241498), SynSys (FP7-HEALTH-242167) and GENCODYS (FP7-HEALTH-241995).

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