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FMR1 neighbor protein (FMR1NB)

Target: FMR1NB
Molecular classification: Other (Cancer/testis antigen; protein-coding gene, possible surface/cytoplasmic localization)

Overview

FMR1 neighbor protein (FMR1NB) is a cancer/testis antigen composed of 255 amino acids and encoded by a gene on chromosome X. It has restricted expression in normal tissues (mainly testis/placenta), but is upregulated in diverse cancers. The protein acts as a positive regulator of mitosis, participating in microtubule nucleation and spindle anchoring during cell division. Its aberrant expression in cancer promotes cell proliferation and invasiveness. Identified using serological analysis (SEREX), FMR1NB/NY-SAR-35 is the focus of experimental peptide vaccine programs, leveraging its immunogenic epitopes for anti-cancer immunotherapy. The potential for biomarker-based patient selection and targeted therapy is under investigation

Other names: CT37FLJ25736NY-SAR-35Sarcoma antigen NY-SAR-35Cancer/testis antigen 37NYSAR35

Mechanism of action

Proposed immunotherapy mechanism: induction of specific cytotoxic T cell responses via MHC-I and MHC-II presentation of FMR1NB-derived epitopes

Biological functions

Cell proliferationCell cycle regulation (positive regulator of mitosis)Microtubule nucleation and spindle anchoring

Disease associations

Cancer (melanoma, sarcoma, lung, breast, bladder, esophageal, ovarian)

Safety considerations

Cancer/testis antigens like FMR1NB have restricted expression mainly in immune-privileged sites (testis/placenta), but off-target immune responses remain a theoretical risk (autoimmunity or infertility).Potential allergenicity, toxicity, or unwanted immune responses to therapeutic epitopes must be evaluated in preclinical and clinical studies

Interacting drugs

None currently clinically approved; experimental cancer vaccines have been developed targeting NY-SAR-35/FMR1NB epitopes

Biomarkers

Tumor tissue expression of FMR1NB/NY-SAR-35 (may be used for patient selection in cancer immunotherapy trials)

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