ACTN1-related thrombocytopenia: Identification of novel families for phenotypic characterization

Roberta Bottega, Caterina Marconi, Michela Faleschini, Gabriele Baj, Claudia Cagioni, Alessandro Pecci, Tommaso Pippucci, Ugo Ramenghi, Simonetta Pardini, Loretta Ngu, Carlo Baronci, Shinji Kunishima, Carlo L. Balduini, Marco Seri, Anna Savoia, Patrizia Noris

Research output: Contribution to journalArticle

Abstract

Inherited thrombocytopenias (ITs) are a heterogeneous group of syndromic and nonsyndromic diseases caused by mutations affecting different genes. Alterations of ACTN1, the gene encoding for α-actinin 1, have recently been identified in a few families as being responsible for a mild form of IT (ACTN1-related thrombocytopenia; ACTN1-RT). To better characterize this disease, we screened ACTN1 in 128 probands and found 10 (8 novel) missense heterozygous variants in 11 families. Combining bioinformatics, segregation, and functional studies, we demonstrated that all but 1 amino acid substitution had deleterious effects. The clinical and laboratory findings of 31 affected individuals confirmed that ACTN1-RT is a mild macrothrombocytopenia with low risk for bleeding. Low reticulated platelet counts and only slightly increased serum thrombopoietin levels indicated that the latest phases of megakaryopoiesis were affected. Given its relatively high frequency in our cohort (4.2%), ACTN1-RT has to be taken into consideration in the differential diagnosis of ITs.

Original languageEnglish
Pages (from-to)869-872
Number of pages4
JournalBlood
Volume125
Issue number5
DOIs
Publication statusPublished - Jan 29 2015

ASJC Scopus subject areas

  • Hematology
  • Biochemistry
  • Cell Biology
  • Immunology

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    Bottega, R., Marconi, C., Faleschini, M., Baj, G., Cagioni, C., Pecci, A., Pippucci, T., Ramenghi, U., Pardini, S., Ngu, L., Baronci, C., Kunishima, S., Balduini, C. L., Seri, M., Savoia, A., & Noris, P. (2015). ACTN1-related thrombocytopenia: Identification of novel families for phenotypic characterization. Blood, 125(5), 869-872. https://doi.org/10.1182/blood-2014-08-594531