[Case Analysis of MYH9 Related Disease with Non-Hodgkin Lymphoma Caused by Rare Mutations]

Area of Science:

• Genetics
• Hematology
• Oncology

Background:

• Hereditary thrombocytopenia is a group of blood disorders characterized by low platelet counts.
• The MYH9 gene encodes non-muscle myosin heavy chain IIA, a protein involved in platelet formation and function.
• Diffuse large B-cell lymphoma (DLBCL) is an aggressive non-Hodgkin lymphoma.

Purpose of the Study:

• To investigate the MYH9 gene sequence in a patient with hereditary thrombocytopenia and DLBCL.
• To explore the potential association between MYH9 gene mutations and tumor development.

Main Methods:

• Whole Exon Sequencing and Sanger Sequencing were used to analyze the MYH9 gene.
• Complete blood count analysis and microscopic examination of platelet morphology were performed.
• Peripheral blood samples from the patient and family members were collected.

Main Results:

• A novel mutation, c.279C>A:p.(Asn93Lys), was identified in exon 2 of the MYH9 gene in the patient and family members, all presenting with thrombocytopenia.
• Avatrombopag administration led to a significant increase in platelet count.
• The identified mutation was associated with hereditary thrombocytopenia.

Conclusions:

• A novel MYH9 gene mutation associated with hereditary thrombocytopenia was discovered.
• The patient's condition showed sensitivity to Avatrombopag treatment.
• The study suggests a potential role of the MYH9 gene in the pathogenesis of diffuse large B-cell lymphoma.