Table of Contents

Overview

The ITPKB gene encodes inositol-trisphosphate 3-kinase B, an enzyme involved in the regulation of intracellular calcium levels and PI3K/Akt signaling pathways. Mutations in ITPKB have been linked to various B-cell lymphomas, including DLBCL, PMBCL and, less commonly, FL.1,2 ITPKB is one of a number of genes affected by aberrant somatic hypermutation in B-cell lymphomas, which complicates the interpretation of mutations at this locus. These mutations are associated with the BN2 genetic subgroup of DLBCL. The mutation pattern in ITPKB implies selection for loss-of-function mutations.

Experimental Evidence

Driver mutations affecting this gene in DLBCL have been experimentally demonstrated to cause a reduction or loss of function (LOF).3

Relevance tier by entity

Entity Tier Description
DLBCL 1 High-confidence DLBCL gene
FL 2 Role of ITPKB mutations in FL requires confirmation
PMBL 1 High-confidence PMBL gene

Mutation incidence in large patient cohorts (GAMBL reanalysis)

DLBCL

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FL

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Mutation pattern and selective pressure estimates

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aSHM regions

chr_name hg19_start hg19_end region regulatory_comment
chr1 226864857 226873452 intron weak_enhancer
chr1 226920563 226927885 TSS active_promoter
chr1 226921088 226927982 intron-1 enhancer

ITPKB Hotspots

Chromosome Coordinate (hg19) ref>alt HGVSp
chr1 226925148 G>C Y4*
chr1 226925148 G>T Y4*

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Expression

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References

1.
Reichel J, Chadburn A, Rubinstein PG, Giulino-Roth L, Tam W, Liu Y, Gaiolla R, Eng K, Brody J, Inghirami G, Carlo-Stella C, Santoro A, Rahal D, Totonchy J, Elemento O, Cesarman E, Roshal M. Flow sorting and exome sequencing reveal the oncogenome of primary Hodgkin and Reed-Sternberg cells. Blood. 2015 Feb 12;125(7):1061–1072.
2.
Schmitz R, Wright GW, Huang DW, Johnson CA, Phelan JD, Wang JQ, Roulland S, Kasbekar M, Young RM, Shaffer AL, Hodson DJ, Xiao W, Yu X, Yang Y, Zhao H, Xu W, Liu X, Zhou B, Du W, Chan WC, Jaffe ES, Gascoyne RD, Connors JM, Campo E, Lopez-Guillermo A, Rosenwald A, Ott G, Delabie J, Rimsza LM, Tay Kuang Wei K, Zelenetz AD, Leonard JP, Bartlett NL, Tran B, Shetty J, Zhao Y, Soppet DR, Pittaluga S, Wilson WH, Staudt LM. Genetics and Pathogenesis of Diffuse Large B-Cell Lymphoma. N Engl J Med. 2018 Apr 12;378(15):1396–1407. PMCID: PMC6010183
3.
Tiacci E, Ladewig E, Schiavoni G, Penson A, Fortini E, Pettirossi V, Wang Y, Rosseto A, Venanzi A, Vlasevska S, Pacini R, Piattoni S, Tabarrini A, Pucciarini A, Bigerna B, Santi A, Gianni AM, Viviani S, Cabras A, Ascani S, Crescenzi B, Mecucci C, Pasqualucci L, Rabadan R, Falini B. Pervasive mutations of JAK-STAT pathway genes in classical Hodgkin lymphoma. Blood. 2018 May 31;131(22):2454–2465. PMCID: PMC6634958

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