Germline copy number variants in RUNX1: An updated case report and a decade-old red herring

Area of Science:

• Genetics
• Hematology
• Oncology

Background:

• Germline variants in RUNX1 are associated with familial platelet disorder with associated myeloid malignancies (FPDMM).
• FPDMM is characterized by platelet defects and increased risk of hematopoietic malignancies.
• Previous genetic evaluation attributed a patient's condition to GATA2 variants.

Purpose of the Study:

• To re-evaluate a case of acute myeloid leukemia and lifelong thrombocytopenia with updated molecular techniques.
• To identify the underlying genetic cause missed in initial testing.
• To highlight the importance of comprehensive genetic analysis, including copy number variants (CNVs).

Main Methods:

• Utilized advanced molecular technology for detecting copy number variants (CNVs).
• Performed re-evaluation of a patient with a history of acute myeloid leukemia and thrombocytopenia.
• Analyzed germline DNA for pathogenic variants in RUNX1 and GATA2.

Main Results:

• A pathogenic deletion of exons 5-6 in RUNX1 was identified.
• This RUNX1 deletion was previously undetected.
• The patient's clinical presentation was re-attributed to the identified RUNX1 pathogenic variant.

Conclusions:

• Comprehensive molecular evaluation is crucial for diagnosing genetic disorders.
• Updated technologies sensitive to copy number variants are essential for accurate genetic diagnosis.
• Careful interpretation of genetic variants, including CNVs, is vital for understanding disease etiology.