We report a 9-year-old Chinese girl with congenital thrombotic thrombocytopenic purpura found to be a compound heterozygote for 2 pathogenic variants in the ADAMTS13 gene, including a novel variation. The girl suffered from recurrent, life-threatening episodes of thrombocytopenia and hemolysis, and laboratory testing showed ADAMST13 enzyme activity of <5%. Sequencing of the ADAMTS13 gene revealed a previously reported missense variant, c.1787C>T (p.Ala596Val), and a novel duplication defined as c.1007_1025dup19 (p.Asp343Leufs*53); the duplication is predicted to result in a premature stop codon and protein truncation. We propose that this novel variant is partly responsible for the patient’s early-onset and severe phenotype.
Journal of Pediatric Hematology / Oncology – Wolters Kluwer Health
Published: Jan 1, 2018
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