A Severe Case of Congenital Thrombotic Thrombocytopenia Purpura Resulting From Compound Heterozygosity Involving a Novel ADAMTS13 Pathogenic Variant

Erin Conboy, Paige I. Partain, Deepti Warad, Michelle L. Kluge, Carola A.S. Arndt, Dong Chen, Vilmarie Rodriguez

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish (US)
JournalJournal of Pediatric Hematology/Oncology
DOIs
StateAccepted/In press - Jul 3 2017

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Purpura
Thrombocytopenia
Thrombotic Thrombocytopenic Purpura
Nonsense Codon
Heterozygote
Hemolysis
Phenotype
Enzymes
Genes
Proteins

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Hematology
  • Oncology

Cite this

A Severe Case of Congenital Thrombotic Thrombocytopenia Purpura Resulting From Compound Heterozygosity Involving a Novel ADAMTS13 Pathogenic Variant. / Conboy, Erin; Partain, Paige I.; Warad, Deepti; Kluge, Michelle L.; Arndt, Carola A.S.; Chen, Dong; Rodriguez, Vilmarie.

In: Journal of Pediatric Hematology/Oncology, 03.07.2017.

Research output: Contribution to journalArticle

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abstract = "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.",
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