dic(7;9)(p11-12;p12-13) PAX5/LOC392027

2010-02-01   Jean-Loup Huret 

1.Genetics, Dept Medical Information, University of Poitiers, CHU Poitiers Hospital, F-86021 Poitiers, France

Clinics and Pathology

Disease

Acute lymphoblastic leukaemia (ALL).

Phenotype stem cell origin

B-cell precursor ALL.

Epidemiology

13 cases to date; sex ratio was 7M/6F, median age was 17 years (range 2-51 years) (An et al., 2008).

Prognosis

No data.

Genes Involved and Proteins

Gene name
LOC392027 (ribosome binding protein 1 homolog 180kDa (dog) pseudogene)
Location
7p12.1
Protein description
Ribosome-binding protein 1 pseudogene.
Gene name
PAX5 (paired box gene 5)
Location
9p13.2
Protein description
Lineage-specific transcription factor; recognizes the concensus recognition sequence GNCCANTGAAGCGTGAC, where N is any nucleotide. Involved in B-cell differentiation. Entry of common lymphoid progenitors into the B cell lineage depends on E2A, EBF1, and PAX5; activates B-cell specific genes and repress genes involved in other lineage commitments. Activates the surface cell receptor CD19 and repress FLT3. Pax5 physically interacts with the RAG1/RAG2 complex, and removes the inhibitory signal of the lysine-9-methylated histone H3, and induces V-to-DJ rearrangements. Genes repressed by PAX5 expression in early B cells are restored in their function in mature B cells and plasma cells, and PAX5 repressed (Fuxa et al., 2004; Johnson et al., 2004; Zhang et al., 2006; Cobaleda et al., 2007).

Result of the Chromosomal Anomaly

Description

Break in PAX5 intron 4. Out of frame fusion of 5 PAX5 - 3 LOC392027.
Atlas Image

Description

The predicted fusion protein contains the DNA binding paired domain of PAX5.

Oncogenesis

Loss of function of PAX5 is likely to be the oncogenic event.

Bibliography

Pubmed IDLast YearTitleAuthors
189575482008Variable breakpoints target PAX5 in patients with dicentric chromosomes: a model for the basis of unbalanced translocations in cancer.An Q et al
174404522007Pax5: the guardian of B cell identity and function.Cobaleda C et al
150040082004Pax5 induces V-to-DJ rearrangements and locus contraction of the immunoglobulin heavy-chain gene.Fuxa M et al
152585792004B cell-specific loss of histone 3 lysine 9 methylation in the V(H) locus depends on Pax5.Johnson K et al
166801442006Transcription factor Pax5 (BSAP) transactivates the RAG-mediated V(H)-to-DJ(H) rearrangement of immunoglobulin genes.Zhang Z et al

Summary

Fusion gene

PAX5/LOC392027 PAX5 (9p13.2) LOC392027 (-) M dic(7;9)(p12;p13)

Note

See also the paper on dic(9;20)(p11-13;q11).

Citation

Jean-Loup Huret

dic(7;9)(p11-12;p12-13) PAX5/LOC392027

Atlas Genet Cytogenet Oncol Haematol. 2010-02-01

Online version: http://atlasgeneticsoncology.org/haematological/1554/dic(7;9)(p11-12;p12-13)