MS4A1
Overview
MS4A1 encodes the CD20 protein, which is the target of rituximab and other therapeutic monoclonal antibodies. MS4A1 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. In relapsed DLBCLs, MS4A1 is sometimes mutated and these mutations have been shown to reduce CD20 expression.1
Relevance tier by entity
| Entity | Tier | Description |
|---|---|---|
 |
1 | high-confidence PMBL/cHL/GZL gene |
 |
1-a | aSHM target and high-confidence DLBCL gene |
Mutation incidence in large patient cohorts (GAMBL reanalysis)
| Entity | source | frequency (%) |
|---|---|---|
| DLBCL | GAMBL genomes | 1.53 |
| DLBCL | Schmitz cohort | 1.49 |
| DLBCL | Reddy cohort | 1.30 |
| DLBCL | Chapuy cohort | 0.43 |
Mutation pattern and selective pressure estimates
| Entity | aSHM | Significant selection | dN/dS (missense) | dN/dS (nonsense) |
|---|---|---|---|---|
| BL | Yes | No | 2.434 | 29.43 |
| DLBCL | Yes | No | 0.000 | 0.00 |
| FL | Yes | No | 0.000 | 0.00 |
aSHM regions
| chr_name | hg19_start | hg19_end | region | regulatory_comment |
|---|---|---|---|---|
| chr11 | 60223385 | 60225310 | TSS | active_promoter |
View coding variants in ProteinPaint hg19 or hg38
View all variants in GenomePaint hg19 or hg38
## MS4A1
Expression 
## References
Citing
If you use the information or data from this site, please cite
Krysta Coyle, Kostiantyn Dreval, Daniel Hodson and Ryan D. Morin. Audit of B-cell cancer genes. Blood Adv (2025) 9 (8): 2019–2031.
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