Overview
CXCR4 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. No notable hot spots have been described in this gene in the context of the cancers listed below. The mutation pattern in DLBCL implies the preferential accumulation of inactivating mutations.
Mutations in this gene were first described in DLBCL in 20121 in FL in 20212 and in BL in 2019.3
Experimental Evidence
Driver mutations affecting this gene in DLBCL have been experimentally demonstrated to cause a reduction or loss of function (LOF).4
Relevance tier by entity
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Mutation incidence in large patient cohorts (GAMBL reanalysis)
DLBCL
| Entity | Collection | N | mutated | Incidence | 95% CI |
|---|---|---|---|---|---|
| DLBCL | GAMBL without Reddy | 1,089 | 24 | 0.0220 | [0.0133,0.0308] |
| DLBCL | GAMBL with Reddy | 2,088 | 39 | 0.0187 | [0.0129,0.0245] |
| DLBCL | BC | 231 | 5 | 0.0216 | [0.0029,0.0404] |
| DLBCL | Dana-Farber | 303 | 6 | 0.0198 | [0.0041,0.0355] |
| DLBCL | NCI | 470 | 12 | 0.0255 | [0.0113,0.0398] |
| DLBCL | Reddy | 999 | 15 | 0.0150 | [0.0075,0.0226] |
| DLBCL | DLBCL_ICGC | 85 | 1 | 0.0118 | [0,0.0347] |
FL
| pathology | Collection | N | mutated | Incidence | CI |
|---|---|---|---|---|---|
| FL | GAMBL without Crouch | 642 | 19 | 0.0296 | [0.0165,0.0427] |
| FL | GAMBL with Crouch | 1,189 | 33 | 0.0278 | [0.0184,0.0371] |
| FL | BC | 379 | 11 | 0.0290 | [0.0121,0.0459] |
| FL | Kalmbach | 164 | 5 | 0.0305 | [0.0042,0.0568] |
| FL | Crouch | 547 | 14 | 0.0256 | [0.0124,0.0388] |
| FL | FL_ICGC | 99 | 3 | 0.0303 | [0,0.0641] |
Mutation pattern and selective pressure estimates
| Entity | Missense dN/dS | Nonsense dN/dS | Q value |
|---|---|---|---|
| BL | 3.4904 | 82.8268 | 0.0057 |
| FL | 4.6911 | 30.4325 | 0.0007 |
| DLBCL | 1.6582 | 11.0942 | 0.0000 |
aSHM regions
| chr_name | hg19_start | hg19_end | region | regulatory_comment |
|---|---|---|---|---|
| chr2 | 136874728 | 136875461 | intron | weak_promoter |
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Expression
Representative Mutations
BL
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