Syndromic thrombocytopenia and predisposition to acute myelogenous leukemia caused by constitutional microdeletions on chromosome 21q

Marwan Shinawi, Ayelet Erez, Deborah L. Shardy, Brendan Lee, Rizwan C. Naeem, George Weissenberger, A. Craig Chinault, Sau Wai Cheung, Sharon E. Plon

Research output: Contribution to journalArticle

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Abstract

Several lines of evidence support the presence of dosage-sensitive genes on chromosome 21 that regulate leukemogenesis and hematopoiesis. We report a detailed clinical and molecular characterization of 3 patients with chronic thrombocytopenia caused by distinct constitutional microdeletions involving chromosomal region 21q22.12. The patients exhibited growth restriction, dysmorphic features, and developmental delays. One patient developed acute myelogenous leukemia (AML) at 6 years of age. All 3 deletions included the RUNX1, CLIC6, DSCR, and KCNE1 genes. Our data provide additional support for the role of RUNX1 haploinsufficiency in megakaryopoiesis and predisposition to AML. The leukemic clone had trisomy 21 resulting from duplication of chromosome 21 containing the RUNX1 deletion. This shows that genes other than RUNX1 must also play a role in AML associated with trisomy 21. We recommend that children with syndromic thrombocytopenia have clinical array-comparative genomic hybridization analysis and appropriate cytogenetic studies to facilitate our ability to provide a definitive diagnosis.

Original languageEnglish (US)
Pages (from-to)1042-1047
Number of pages6
JournalBlood
Volume112
Issue number4
DOIs
StatePublished - Aug 15 2008
Externally publishedYes

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Chromosomes
Acute Myeloid Leukemia
Thrombocytopenia
Chromosomes, Human, Pair 21
Genes
Down Syndrome
Haploinsufficiency
Comparative Genomic Hybridization
Gene Dosage
Cytogenetic Analysis
Hematopoiesis
Clone Cells
Growth

ASJC Scopus subject areas

  • Hematology
  • Biochemistry
  • Cell Biology
  • Immunology

Cite this

Syndromic thrombocytopenia and predisposition to acute myelogenous leukemia caused by constitutional microdeletions on chromosome 21q. / Shinawi, Marwan; Erez, Ayelet; Shardy, Deborah L.; Lee, Brendan; Naeem, Rizwan C.; Weissenberger, George; Chinault, A. Craig; Cheung, Sau Wai; Plon, Sharon E.

In: Blood, Vol. 112, No. 4, 15.08.2008, p. 1042-1047.

Research output: Contribution to journalArticle

Shinawi, M, Erez, A, Shardy, DL, Lee, B, Naeem, RC, Weissenberger, G, Chinault, AC, Cheung, SW & Plon, SE 2008, 'Syndromic thrombocytopenia and predisposition to acute myelogenous leukemia caused by constitutional microdeletions on chromosome 21q', Blood, vol. 112, no. 4, pp. 1042-1047. https://doi.org/10.1182/blood-2008-01-135970
Shinawi, Marwan ; Erez, Ayelet ; Shardy, Deborah L. ; Lee, Brendan ; Naeem, Rizwan C. ; Weissenberger, George ; Chinault, A. Craig ; Cheung, Sau Wai ; Plon, Sharon E. / Syndromic thrombocytopenia and predisposition to acute myelogenous leukemia caused by constitutional microdeletions on chromosome 21q. In: Blood. 2008 ; Vol. 112, No. 4. pp. 1042-1047.
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