A novel RUNX1 exon 3 - 7 deletion causing a familial platelet disorder

Ibrahim Abdullah F Almazni, Pavel Chudakou, Alison Dawson-Meadows, Kate Downes, Kathleen Freson, Joanne Mason, Paula Page, Kim Reay, Bethan Myers, Neil Morgan

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Abstract

Familial Platelet Disorder with associated Myeloid Malignancy (FPDMM) is a rare inherited disorder confirmed with the presence of a pathogenic germline RUNX1 variant and is thought to be heavily underdiagnosed. RUNX1 has also been found to be mutated in up to 10% of adult AML cases and other cell malignancies. We performed targeted next-generation sequencing and subsequent MLPA analysis in a kindred with multiple affected individuals with low platelet counts and a bleeding history. We detected a novel heterozygous exon 3–7 large deletion in the RUNX1 gene in all affected family members which is predicted to remove all of the Runt-homology DNA-binding domain and a portion of the Activation domain. Our results show that the combination of targeted NGS and MLPA analysis is an effective way to detect copy number variants (CNVs) which would be missed by conventional sequencing methods. This precise diagnosis offers the possibility of accurate counseling and clinical management in such patients who could go onto develop other cell malignancies.
Original languageEnglish
JournalPlatelets
Early online date22 Feb 2021
DOIs
Publication statusE-pub ahead of print - 22 Feb 2021

Bibliographical note

Funding
This work was supported by the British Heart Foundation [FS/15/18/31317,FS/18/11/33443,PG/13/36/30275, PG/16/103/32650]; Saudi Arabia Cultural Bureau in London.

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