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t(7;9)(q34;q34) TRB/NOTCH1

Written2003-01Jacques Boyer
Laboratoire d' hématologie, CH du MANS, France

(Note : for Links provided by Atlas : click)


ICD-Morpho 9837/3 T lymphoblastic leukaemia/lymphoma
Atlas_Id 1055

Clinics and Pathology

Disease Specifically associated with T-cell Acute Lymphoblastic Leukemia (T-ALL).
Note This translocation is related to Notch1 (TAN1) dysregulation. Mutation or chromosomal rearrangements of Notch gene have not yet been identified outside of T-ALL but Notch1 was recently studied by immunohistochemistry in various subsets of human lymphomas. Strong staining was found in Hodgkin's lymphoma (HL) and anaplastic large cell lymphoma (ALCL) but much additional works is needed to determine whether Notch signaling is necessary for HL and ALCL growth and survival.
Phenotype / cell stem origin T lineage. CD4+ CD8+ double positive stage.
Epidemiology Rare: < 1% among T-ALL.


Cytogenetics Morphological 9q34 is a partner of 7q34. The other partners are 1p34, 1p32, 9q32, 10q24, 11p13, 15q22, 19p13
Additional anomalies In T- lymphoblastic cell lines: polyploidy, inv(2)(p22;q11), inv(14)(q11;q32), del(6)(q23q27), del(4)(q13q35)

Genes involved and Proteins

Gene NameTRB (T cell Receptor Beta)
Location 7q34
Dna / Rna The TRB locus spans 685 Kb. The locus contains 2 types of coding elements : TCR elements (64-67 variable genes TRBV, 2 clusters of diversity, joining and constant segments) and 8 trypsinogen genes. A portion of the TCRB locus has been duplicated and translocated to the chromosome 9 at 9p21.
Protein T cell receptor beta chains.
Gene NameNOTCH1 (Notch homolog 1, translocation-associated (Drosophila))
Location 9q34.3
Note Notch receptors are highly conserved transmembrane glycoproteins that regulate the morphogenesis through a signaling pathway with pleiotropic effects of apoptosis, proliferation and cellular differenciation. At least one Notch homolog is expressed in human bone marrow CD34+ cells, on the basis of this finding, it is likely that members of Notch family, including TAN1, may be involved in mediating cell-fate decisions during hematopoiesis.
Dna / Rna DNA size: 49715 bases
Protein Size: 2256 amino acids, 272550 Da. Functions as a receptor for membrane-bound ligands Jagged1.

Result of the chromosomal anomaly

Hybrid gene
Description The t(7;9) disrupts the Notch1 gene, fusing the 3¹end portion encoding its intracellular domain (ICN) to enhancer and promoter elements of the T cell receptor (TCRB). This results in overexpression of a constitutively active form of Notch activating genes that inhibit cell differenciation.The t(7;9)(q34;q34) results in a serie of tumor specific 5¹deleted Notch1 mRNA transcripts. All known beakpoints fall within a single intron in the coding sequence for the EGF repeat 34 of Notch1.
The t(7 ;9) truncated transcripts encode ICN1-like polypetides (ICN = intracellular portion of Notch receptor). These polypeptides localize to the nucleus and structurally resemble ICN1. The intracellular portion of Notch1 contains six ankyrin repeats that are similar to those found in cytoplasmic I kappa B proteins or I kappa B are specific inhibitors of nuclear factor NFKappa B transcription factors.
Fusion Protein
Oncogenesis On primary effect of constitutive Notch 1 activation is the maturation arest of T lymphoblastes at the CD4+ CD8+ double positive stage but recent works suggest that Notch contributes to T cell transformation by influencing proliferation and survival, rather than merely blocking differenciation.


Cytogenetic abnormalities in adult acute lymphoblastic leukemia: correlations with hematologic findings outcome. A Collaborative Study of the Groupe Français de Cytogénétique Hématologique (GFCH).
Blood. 1996 ; 87 (8) : 3135-3142.
PMID 8605327
Notch signaling in cancer.
Allenspach EJ, Maillard I, Aster JC, Pear WS
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PMID 12496471
Essential roles for ankyrin repeat and transactivation domains in induction of T-cell leukemia by notch1.
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Molecular and cellular biology. 2000 ; 20 (20) : 7505-7515.
PMID 11003647
TAN-1, the human homolog of the Drosophila notch gene, is broken by chromosomal translocations in T lymphoblastic neoplasms.
Ellisen LW, Bird J, West DC, Soreng AL, Reynolds TC, Smith SD, Sklar J
Cell. 1991 ; 66 (4) : 649-661.
PMID 1831692
Gene expression signatures define novel oncogenic pathways in T cell acute lymphoblastic leukemia.
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Cancer cell. 2002 ; 1 (1) : 75-87.
PMID 12086890
T cell leukemia-associated human Notch/translocation-associated Notch homologue has I kappa B-like activity and physically interacts with nuclear factor-kappa B proteins in T cells.
Guan E, Wang J, Laborda J, Norcross M, Baeuerle PA, Hoffman T
The Journal of experimental medicine. 1996 ; 183 (5) : 2025-2032.
PMID 8642313
Neoplastic transformation by Notch requires nuclear localization.
Jeffries S, Capobianco AJ
Molecular and cellular biology. 2000 ; 20 (11) : 3928-3941.
PMID 10805736
A human homologue of the Drosophila developmental gene, Notch, is expressed in CD34+ hematopoietic precursors.
Milner LA, Kopan R, Martin DI, Bernstein ID
Blood. 1994 ; 83 (8) : 2057-2062.
PMID 7512837
Karyotype and T-cell receptor expression in T-lineage acute lymphoblastic leukemia.
Secker-Walker LM, Campana D, Hawkins JM, Sampson RE, Coustan-Smith E
Genes, chromosomes & cancer. 1992 ; 4 (1) : 41-45.
PMID 1377008
Clinical and biologic characterization of T-cell neoplasias with rearrangements of chromosome 7 band q34.
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Blood. 1988 ; 71 (2) : 395-402.
PMID 2962650


This paper should be referenced as such :
Boyer, J
Atlas Genet Cytogenet Oncol Haematol. 2003;7(2):106-107.
Free journal version : [ pdf ]   [ DOI ]
On line version :

Other genes implicated (Data extracted from papers in the Atlas) [ 2 ]


Translocations implicated (Data extracted from papers in the Atlas)

 t(7;9)(q34;q34) TRB/NOTCH1

External links

Mitelman databaset(7;9)(q34;q34)
arrayMap (UZH-SIB Zurich)Topo ( C42) Morph ( 9837/3) -   [auto + random 100 samples .. if exist ]   [tabulated segments]
REVIEW articlesautomatic search in PubMed
Last year articlesautomatic search in PubMed
All articlesautomatic search in PubMed

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