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t(2;3)(p15-23;q26-27) ?/MECOM

Written2004-05Marian Stevens-Kroef
Clinical Cytogeneticist, UMC St. Radboud, Dept. Human Genetics, Div. Cytogenetics, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
Updated2005-08Jean-Loup Huret
Genetics, Dept Medical Information, University of Poitiers, CHU Poitiers Hospital, F-86021 Poitiers, France

(Note : for Links provided by Atlas : click)

Identity

ICD-Topo C420,C421,C424 BLOOD, BONE MARROW, & HEMATOPOIETIC SYS
ICD-Morpho 9861/3 AML with mutated NPM1; AML with mutated CEBPA; Acute myeloid leukaemia, NOS
ICD-Morpho 9920/3 Therapy-related myeloid neoplasms
ICD-Morpho 9975/3 Chronic myelogenous leukaemia, BCR-ABL1 positive; Myeloproliferative neoplasm, unclassifiable; Myelodysplastic/myeloproliferative neoplasm, unclassifiable
ICD-Morpho 9989/3 Myelodysplastic syndrome, unclassifiable
Atlas_Id 1274
Note There are 2 subtypes of the t(2p;3q); in one type the breakpoint on chromosome 2 is assigned to bands 2p21-23, whereas the breakpoint for the other type of breakpoint is localized at 2p15-21.
 
  Partial GTG (Marian Stevens-Kroef, left) and RFA (Anne Hagemeijer, right) banded karyotypes of t(2;3)( p15-23;q26-27) with the distal (A) and proximal (B) breakpoint on chromosome 2.

Clinics and Pathology

Disease Myeloid malignancies: myelodysplastic syndrome (MDS) in 1/4 of cases, with various FAB diagnoses (refractory anaemia (RA), RA with ringed sideroblasts (RARS), RA with excess of blasts (RAEB), RAEB in transformation (RAEB-t), and chronic myelomonocytic leukemia (CMML)), acute myeloid leukaemia (AML) in 60% of cases (M2-AML in 1/4 of all cases), blast crisis of a chronic myelogenous leukaemia (BC-CML) in about 10% of cases
Etiology 1/4 of cases were therapy related leukemias, and 10% were BC-CML cases
Epidemiology At least 50 cases described; sex ratio: 1.33 M/F; median age around 50 yrs, most patients being between 30 and 70 yr old (range 3-80 yrs).
Cytology High platelet count, dysmegakaryopoiesis, and multilineage dysplasia in 80 to 90% of cases
Prognosis Median survival 12 months (range 1-53 mths), with a few patients surviving with bone marrow transplantation.

Cytogenetics

Note Heterogeneous breakpoints by cytogenetic and FISH analysis; FISH mapping of 2p breakpoints was very heterogeneous ranging from p14 or p15 to p23; FISH mapping of the 3q breakpoint was within the EVI1-MDS region (between RP11-694D5 (centromeric) and RP11-362K14 (telomeric) in the great majority of cases.
Additional anomalies Sole anomaly in 40%, associated with -7 in 30%, with del(5q) in 15%, with del(7q) in 10%, with t(9;22)(q34;q11) in 10%, and with a complex karyotype in 20% of cases.

Genes involved and Proteins

Note Molecular analysis has been performed in only a very few cases. In most of these, ectopic expression of EVI1 was demonstrated, but rare cases seem not to involve this gene. Therefore, characteristics of EVI1 involvement (high platelet count, multilineage dysplasia, monosomy 7, prior history of carcinogen exposure and a poor prognosis) may not be present in further cases with apparently the same breakpoints.
The gene(s) involved in chromosome 2 is/are unknown
Gene Name MECOM
Location 3q26
Note There is a direct correlation between mapping of the 3q breakpoint in the above given EVI1-MDS region and EVI1 ectopic expression by RT-PCR. Rare case with 3q break outside this interval failed to show ectopic expression of EVI1.
Dna / Rna EVI1 contains 12 exons.
Protein EVI1 may play an important role in organogenesis, cell migration, cell growth, and differentiation.

Bibliography

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Translocation (2;3)(p22;q28) is associated with myeloid disorders.
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Rearrangements of chromosome 3 involving bands 3q21 and 3q26 are associated with normal or elevated platelet counts in acute nonlymphocytic leukemia.
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Translocation t(2;3)(p15-23;q26-27) in myeloid malignancies: report of 21 new cases, clinical, cytogenetic and molecular genetic features.
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Citation

This paper should be referenced as such :
Huret, JL
t(2;3)(p15-23;q26-27)
Atlas Genet Cytogenet Oncol Haematol. 2006;10(1):9-11.
Free journal version : [ pdf ]   [ DOI ]
On line version : http://AtlasGeneticsOncology.org/Anomalies/t0203p23q26ID1274.html
History of this paper:
Stevens-Kroef, M. t(2;3)(p15-23;q26-27). Atlas Genet Cytogenet Oncol Haematol. 2004;8(3):243-244.
http://documents.irevues.inist.fr/bitstream/handle/2042/38111/05-2004-t0203p23q26ID1274.pdf


Translocations implicated (Data extracted from papers in the Atlas)

 t(2;3)(p15;q26) ?/MECOM

External links

Mitelman databaset(2;3)(p15;q26) [Case List]    t(2;3)(p15;q26) [Association List] Mitelman database (CGAP - NCBI)
arrayMapTopo ( C42) Morph ( 9861/3) - arrayMap (UZH-SIB Zurich)  [auto + random 100 samples .. if exist ]   [tabulated segments]
arrayMapTopo ( C42) Morph ( 9920/3) - arrayMap (UZH-SIB Zurich)  [auto + random 100 samples .. if exist ]   [tabulated segments]
arrayMapTopo ( C42) Morph ( 9975/3) - arrayMap (UZH-SIB Zurich)  [auto + random 100 samples .. if exist ]   [tabulated segments]
arrayMapTopo ( C42) Morph ( 9989/3) - arrayMap (UZH-SIB Zurich)  [auto + random 100 samples .. if exist ]   [tabulated segments]
 
 
Disease databaset(2;3)(p15-23;q26-27) ?/MECOM
REVIEW articlesautomatic search in PubMed
Last year articlesautomatic search in PubMed
All articlesautomatic search in PubMed


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indexed on : Thu Jan 12 11:18:08 CET 2017


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