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| Gene | B2M |
| Variant | C45W |
| Impact List | missense |
| Protein Effect | loss of function - predicted |
| Gene Variant Descriptions | B2M C45W lies within the Ig-like C1-type domain of the B2m protein (UniProt.org). C45W results in the loss of the disulfide bond between C45 and C100 (PMID: 16648140), increased degradation of B2m, down regulation of HLA class I molecules, and defects in antigen presentation in cultured cells (PMID: 16648140), and therefore, is predicted to result in a loss of B2m protein function. |
| Associated Drug Resistance | |
| Category Variants Paths |
B2M mutant B2M inact mut B2M C45W |
| Transcript | NM_004048.4 |
| gDNA | chr15:g.44715490C>G |
| cDNA | c.135C>G |
| Protein | p.C45W |
| Source Database | RefSeq |
| Genome Build | GRCh38/hg38 |
| Transcript | gDNA | cDNA | Protein | Source Database | Genome Build |
|---|---|---|---|---|---|
| XM_005254549 | chr15:g.44715490C>G | c.135C>G | p.C45W | RefSeq | GRCh38/hg38 |
| NM_004048.4 | chr15:g.44715490C>G | c.135C>G | p.C45W | RefSeq | GRCh38/hg38 |
| NM_004048 | chr15:g.44715490C>G | c.135C>G | p.C45W | RefSeq | GRCh38/hg38 |
| XM_005254549.4 | chr15:g.44715490C>G | c.135C>G | p.C45W | RefSeq | GRCh38/hg38 |
| XM_005254549.3 | chr15:g.44715490C>G | c.135C>G | p.C45W | RefSeq | GRCh38/hg38 |
| NM_004048.2 | chr15:g.44715490C>G | c.135C>G | p.C45W | RefSeq | GRCh38/hg38 |
| Molecular Profile | Indication/Tumor Type | Response Type | Therapy Name | Approval Status | Evidence Type | Efficacy Evidence | References |
|---|---|---|---|---|---|---|---|
| B2M C45W | melanoma | resistant | Interferon gamma | Preclinical - Cell culture | Actionable | In a preclinical study, a melanoma cell line harboring B2M C45W displayed greatly reduced expression of HLA class I molecules, which was not corrected by treatment with interferon gamma (PMID: 16648140). | 16648140 |