This gene encodes a transcription factor that regulates MHC class II genes by binding to a promoter element referred to as an X box. This gene product is a bZIP protein, which was also identified as a cellular transcription factor that binds to an enhancer in the promoter of the T cell leukemia virus type 1 promoter. It may increase expression of viral proteins by acting as the DNA binding partner of a viral transactivator. It has been found that upon accumulation of unfolded proteins in the endoplasmic reticulum (ER), the mRNA of this gene is processed to an active form by an unconventional splicing mechanism that is mediated by the endonuclease inositol-requiring enzyme 1 (IRE1). The resulting loss of 26 nt from the spliced mRNA causes a frame-shift and an isoform XBP1(S), which is the functionally active transcription factor. The isoform encoded by the unspliced mRNA, XBP1(U), is constitutively expressed, and thought to function as a negative feedback regulator of XBP1(S), which shuts off transcription of target genes during the recovery phase of ER stress. A pseudogene of XBP1 has been identified and localized to chromosome 5. [provided by RefSeq, Jul 2008]
Overall distribution
Tissue specific distribution
Expression restricted in 1 cancer type(s)
Cancer specific in breast cancer subtype (ER; Her2; LumA; LumB)
Overall distribution
Tissue specific distribution
Gscore (Amp):
0.00
Gscore (Del):
0.00
Overall distribution
Tissue specific distribution
Mscore:
0.00
Overall
Tissue specific
Total fusion occurrence:
7
Fusions detected in 4 cancer type(s)
Overall
Tissue specific
CRISPR: STRONGLY SELECTIVE
Functional class:
Transcription factor
JensenLab PubMed score:
780.25 (Percentile rank: 94.00%)
PubTator score:
457.14 (Percentile rank: 92.74%)
Target development/druggability level:
TchemThese targets have activities in ChEMBL or DrugCentral that satisfy the activity thresholds detailed below.
Tractability (small molecule):
Predicted TractableTargets with a predicted Ro5 druggable domain (druggable genome); Targets with a drugEBIlity score equal or greater than 0
Tractability (antibody):
Predicted Tractable - Medium to low confidenceTargets with GO cell component terms plasma membrane or secreted with low or unknown confidence; Targets with predicted signal peptide and transmembrane domains; GO cell component - medium confidence; Human Protein Atlas - high confidence
