Identification of a common microdeletion cluster in 7q21.3 subband among patients with myeloid leukemia and myelodysplastic syndrome

Monosomy 7 and interstitial deletions in the long arm of chromosome 7 (−7/7q−) is a common nonrandom chromosomal abnormality found frequently in myeloid disorders including acute myeloid leukemia (AML), myelodysplastic syndrome (MDS), and juvenile myelomonocytic leukemia (JMML). Using a short probe-...

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Veröffentlicht in:Biochemical and biophysical research communications 2009-05, Vol.383 (2), p.245-251
Hauptverfasser: Asou, Hiroya, Matsui, Hirotaka, Ozaki, Yuko, Nagamachi, Akiko, Nakamura, Megumi, Aki, Daisuke, Inaba, Toshiya
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container_issue 2
container_start_page 245
container_title Biochemical and biophysical research communications
container_volume 383
creator Asou, Hiroya
Matsui, Hirotaka
Ozaki, Yuko
Nagamachi, Akiko
Nakamura, Megumi
Aki, Daisuke
Inaba, Toshiya
description Monosomy 7 and interstitial deletions in the long arm of chromosome 7 (−7/7q−) is a common nonrandom chromosomal abnormality found frequently in myeloid disorders including acute myeloid leukemia (AML), myelodysplastic syndrome (MDS), and juvenile myelomonocytic leukemia (JMML). Using a short probe-based microarray comparative genomic hybridization (mCGH) technology, we identified a common microdeletion cluster in 7q21.3 subband, which is adjacent to ‘hot deletion region’ thus far identified by conventional methods. This common microdeletion cluster contains three poorly characterized genes; Samd9, Samd9L, and a putative gene LOC253012, which we named Miki. Gene copy number assessment of three genes by real-time PCR revealed heterozygous deletion of these three genes in adult patients with AML and MDS at high frequency, in addition to JMML patients. Miki locates to mitotic spindles and centrosomes and downregulation of Miki by RNA interference induced abnormalities in mitosis and nuclear morphology, similar to myelodysplasia. In addition, a recent report indicated Samd9 as a tumor suppressor. These findings indicate the usefulness of the short probe-based CGH to detect microdeletions. The three genes located to 7q21.3 would be candidates for myeloid tumor-suppressor genes on 7q.
doi_str_mv 10.1016/j.bbrc.2009.04.004
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subjects 60 APPLIED LIFE SCIENCES
Base Sequence
Cell Line, Tumor
Cell Nucleus - ultrastructure
Chromosome Aberrations
CHROMOSOMES
Chromosomes, Human, Pair 7 - genetics
GENES
Genes, Tumor Suppressor
Humans
Leukemia, Myeloid - genetics
MITOSIS
Mitosis - genetics
Monosomy 7
MORPHOLOGY
Multigene Family
Myelodysplastic Syndromes - genetics
MYELOID LEUKEMIA
Myeloid malignancy
PATIENTS
POLYMERASE CHAIN REACTION
Proteins - genetics
RNA
Sequence Deletion
Tumor suppressor
title Identification of a common microdeletion cluster in 7q21.3 subband among patients with myeloid leukemia and myelodysplastic syndrome
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