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t(12;21)(p13;q22) ETV6/RUNX1

Written1997-08Jean-Loup Huret, Alain Bernheim
Laboratoire de Cytogénétique, UMR 1599 CNRS, Institut Gustave Roussy, 94805 Villejuif, France

(Note : for Links provided by Atlas : click)

Identity

ICD-Topo C420,C421,C424 BLOOD, BONE MARROW, & HEMATOPOIETIC SYS
ICD-Morpho 9811/3 B lymphoblastic leukaemia/lymphoma, NOS
ICD-Morpho 9814/3 B lymphoblastic leukaemia/lymphoma with t(12;21)(p13;q22); TEL-AML1 (ETV6-RUNX1)
Atlas_Id 1073
 
  t(12;21)(p13;q22) R- bandind and FISH - Courtesy Hossein Mossafa.

Clinics and Pathology

Disease B cell ALL
Phenotype / cell stem origin L1 and L2, CD10+
Epidemiology 15 to 35% of paediatric B-lineage ALL: so far the most frequent translocation in this group; rare or absent in adults and in infants; age: children; no case >20 yrs so far; male and female equally represented
Clinics standard ALL
Prognosis CR in all cases; prognosis seems good

Cytogenetics

Cytogenetics Morphological t(12;21) often remained undetected
Cytogenetics Molecular easily detected by chromosomes 12 and 21 painting or specific probes
Additional anomalies frequent del(12)(p12) on the other chromosome; in rare cases duplication of der(21)t(12;21); looks like a +21
Variants t(6;12;21), t(3;12;21)

Genes involved and Proteins

Gene NameETV6 (ets variant 6)
Location 12p13.2
Protein contains a HLH domain and a ETS-DNA binding domain; ETS-related transcription factor
Gene NameRUNX1 (runt-related transcription factor 1 (acute myeloid leukemia 1; aml1 oncogene))
Location 21q22.12
Dna / Rna transcription is from telomere to centromere
Protein contains a Runt domain and, in the C-term, a transactivation domain; forms heterodimers; widely expressed; nuclear localisation; transcription factor (activator) for various hematopoietic-specific genes

Result of the chromosomal anomaly

Hybrid gene
  ETV6 (TEL) and RUNX1 (AML1) breakpoints in the t(12;21) / 5' ETV6 - 3' RUNX1 fusion gene - Courtesy Hossein Mossafa.
 
Description TEL-AML1 chimaeric gene; 5' centromere to 3' telomere orientation
Transcript the fusion transcript on chromosome 21 TEL -AML1 is the crucial one; the AML1-TEL transcript is absent in some cases; the other TEL allele is often deleted.
Detection RT-PCR of the fusion transcript
  
Fusion Protein
Description Helix loop helix of TEL fused to the nearly entire AML1 protein, comprising the Runt domain and the transactivation domain
  

Bibliography

Fusion of PDGF receptor beta to a novel ets-like gene, tel, in chronic myelomonocytic leukemia with t(5;12) chromosomal translocation.
Golub TR, Barker GF, Lovett M, Gilliland DG
Cell. 1994 ; 77 (2) : 307-316.
PMID 8168137
 
The 12;21 translocation involving TEL and deletion of the other TEL allele: two frequently associated alterations found in childhood acute lymphoblastic leukemia.
Raynaud S, Cave H, Baens M, Bastard C, Cacheux V, Grosgeorge J, Guidal-Giroux C, Guo C, Vilmer E, Marynen P, Grandchamp B
Blood. 1996 ; 87 (7) : 2891-2899.
PMID 8639909
 
High frequency of t(12;21) in childhood B-lineage acute lymphoblastic leukemia.
Romana SP, Poirel H, Leconiat M, Flexor MA, Mauchauffé M, Jonveaux P, Macintyre EA, Berger R, Bernard OA
Blood. 1995 ; 86 (11) : 4263-4269.
PMID 7492786
 

Citation

This paper should be referenced as such :
Huret, JL ; Bernheim, A
t(12;21)(p12;q22)
Atlas Genet Cytogenet Oncol Haematol. 1997;1(1):19-20.
Free journal version : [ pdf ]   [ DOI ]
On line version : http://AtlasGeneticsOncology.org/Anomalies/t1221ID1073.html


Other genes implicated (Data extracted from papers in the Atlas) [ 6 ]

Genes RUNX1 CBFB ETV6 FLI1 MIR100

Translocations implicated (Data extracted from papers in the Atlas)

 t(12;21)(p13;q22) ETV6/RUNX1

External links

ETV6 (12p13.2) RUNX1 (21q22.12)

ETV6 (12p13.2) RUNX1 (21q22.12)

Mitelman databaset(12;21)(p13;q22) [Case List]    t(12;21)(p13;q22) [Association List] Mitelman database (CGAP - NCBI)
COSMICHisto = - Site = haematopoietic_and_lymphoid_tissue (COSMIC)
arrayMapTopo ( C42) Morph ( 9811/3) - arrayMap (UZH-SIB Zurich)  [auto + random 100 samples .. if exist ]   [tabulated segments]
arrayMapTopo ( C42) Morph ( 9814/3) - arrayMap (UZH-SIB Zurich)  [auto + random 100 samples .. if exist ]   [tabulated segments]
 
Mitelman databaseETV6/RUNX1 [MCList]  ETV6 (12p13.2) RUNX1 (21q22.12)
TICdbETV6/RUNX1  ETV6 (12p13.2) RUNX1 (21q22.12)
 
Disease databaset(12;21)(p13;q22) ETV6/RUNX1
REVIEW articlesautomatic search in PubMed
Last year articlesautomatic search in PubMed
All articlesautomatic search in PubMed


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