Details for: PCAT4

Gene ID: 118425

Gene Type:  ncRNA (Non-coding RNA)  - A functional RNA molecule that is transcribed from DNA but not translated into a protein. Includes classes like miRNA and lncRNA.

Symbol: PCAT4

Ensembl ID: ENSG00000251321

Description: prostate cancer associated transcript 4

Selected Context(s):  Overall

Cell Significance Landscape

Contexts:

Significant Cells

Cell Significance Index (CSI) scores for the chosen context(s)

  • retinal rod cell CL0000604
    CSI 14.21
    rCSI 25.04%
    PRS 99.63
  • retinal cone cell CL0000573
    CSI 5.9
    rCSI 9.5%
    PRS 99.52
  • luminal cell of prostate epithelium CL0002340
    CSI 4.53
    rCSI 24.35%
    PRS 99.88
  • eye photoreceptor cell CL0000287
    CSI 1.38
    rCSI 15.52%
    PRS 100

Cell ID: Standard Cell Ontology term used for mapping and comparing cells across experiments. Ensures consistency in analyzing cellular functions across tissues.
Fold Change: Represents the ratio of the current Cell Significance Index to the Cell Significance Index Threshold, indicating how much the gene expression has changed compared to a baseline.
Cell Significance Index: Reflects how strongly a gene is expressed in this specific cell.

Cell ID: Standard Cell Ontology term used for mapping and comparing cells across experiments. Ensures consistency in analyzing cellular functions across tissues.
Fold Change: Represents the ratio of the current Cell Significance Index to the Cell Significance Index Threshold, indicating how much the gene expression has changed compared to a baseline.
Cell Significance Index: Reflects how strongly a gene is expressed in this cell type. Calculated using techniques like effect size estimation and bootstrapping for reliability.

Cell ID: Standard Cell Ontology term used for mapping and comparing cells across experiments. Ensures consistency in analyzing cellular functions across tissues.
Fold Change: Represents the ratio of the current Cell Significance Index to the Cell Significance Index Threshold, indicating how much the gene expression has changed compared to a baseline.
Cell Significance Index: Reflects how strongly a gene is expressed in this cell type. Calculated using techniques like effect size estimation and bootstrapping for reliability.
Network Configuration

Explore relationships of the current gene. Select an Interaction Source: 'ONTOLOGY' for shared pathways (GO/Reactome) or 'STRING' for protein-protein interactions. Further refine by selecting context genes and comparing Cell Significance Index (CSI) scores between baseline and target cell types and their specific contexts.

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  • Node Color (Target Cell CSI, relative to current network):
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    • High
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    • CSI N/A
  • Node Size: Proportional to Target Cell CSI magnitude
  • STRING PPI Edge
  • Shared Pathway Edge (ONTOLOGY)

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Other Information

This section provides additional information about the gene, including a description generated by an AI language model and details about associated proteins.

## Summary [PCAT4](/details-gene/118425) (Prostate Cancer Associated Transcript 4) is a non-coding RNA located on chromosome 4q21.21. While originally identified in the context of prostate cancer, expression data reveals its most prominent and specific role is within the retina. It is a highly significant marker for photoreceptor cells, particularly [retinal rod cell](/details-cell/CL0000604)s, suggesting a crucial function in vision or the maintenance of these specialized neurons. Its notable expression in [luminal cell of prostate epithelium](/details-cell/CL0002340) aligns with its name and points towards a potential dual role in both normal glandular physiology and malignancy. ## Cellular Roles and Expression Landscape The expression profile of [PCAT4](/details-gene/118425) is characterized by high specificity for a limited set of terminally differentiated cell types, primarily in the eye and prostate gland. **Overall**, the gene's most significant expression is observed in photoreceptor cells of the retina. It is an exceptionally strong marker for [retinal rod cell](/details-cell/CL0000604) (CSI: 14.21) and is also significantly expressed in [retinal cone cell](/details-cell/CL0000573) (CSI: 5.90) and the broader [eye photoreceptor cell](/details-cell/CL0000287) category. This restricted and high-level expression strongly suggests a specialized function related to phototransduction, photoreceptor cell maintenance, or retinal development. Concurrent with its role in the retina, [PCAT4](/details-gene/118425) shows significant expression in the [luminal cell of prostate epithelium](/details-cell/CL0002340) (CSI: 4.53). This observation is consistent with its discovery and name, implying a function in the normal prostate gland that may be dysregulated during the development of prostate cancer. The gene's expression in two such distinct, highly specialized tissues suggests it may be involved in a fundamental cellular process common to both or regulated by a shared transcriptional program. ## Pathways and Molecular Function Specific functional annotation data for [PCAT4](/details-gene/118425) is not provided. As a non-coding RNA, it is presumed to function through regulatory mechanisms rather than by being translated into a protein. Such mechanisms could include modulating the transcription of nearby or distant genes, altering the stability of messenger RNAs, or acting as a molecular scaffold to guide the assembly of protein complexes. Its association with prostate cancer suggests a potential involvement in pathways critical to oncogenesis, such as cell cycle control, apoptosis, or androgen receptor signaling. Its profound expression in retinal cells points towards a role in pathways governing phototransduction or neuronal homeostasis. ## Research Directions The unique dual-tissue specificity of [PCAT4](/details-gene/118425) in the retina and prostate presents compelling avenues for investigation into its function in both health and disease. ### Proposed Hypotheses 1. **[PCAT4](/details-gene/118425) is a master regulator of photoreceptor identity and function.** It may control a network of genes essential for the survival and light-sensing capabilities of [retinal rod cell](/details-cell/CL0000604)s. Dysregulation or mutation of [PCAT4](/details-gene/118425) could therefore be a contributing factor in inherited retinal degenerations like retinitis pigmentosa. 2. **In the prostate, [PCAT4](/details-gene/118425) functions as a lineage-specific oncogene.** Its expression may be necessary for maintaining the differentiated state of luminal cells, but it could be hijacked during malignant transformation to promote cell proliferation or survival, possibly through interaction with the androgen receptor signaling axis. ### Experimental Approach To test the hypothesis of [PCAT4](/details-gene/118425)'s role in prostate cancer, a loss-of-function study could be conducted. Prostate cancer cell lines (e.g., LNCaP, VCaP) that endogenously express [PCAT4](/details-gene/118425) could be treated with targeted antisense oligonucleotides (ASOs) or a CRISPRi system to deplete the lncRNA. The impact of its knockdown would then be assessed by measuring changes in cell proliferation (e.g., via cell counting or BrdU incorporation), apoptosis (e.g., via TUNEL assay), and androgen receptor activity (e.g., via qPCR of AR target genes like *KLK3*). ### Therapeutic Potential [PCAT4](/details-gene/118425) represents a potential therapeutic target, particularly for prostate cancer. Its nature as an RNA makes it amenable to targeting with nucleic acid-based therapeutics such as ASOs or siRNAs, which could be designed for specific inhibition. However, its extremely high and specific expression in retinal photoreceptors raises a significant safety concern. Any therapeutic strategy targeting [PCAT4](/details-gene/118425) would require a delivery mechanism highly specific to the prostate to avoid potentially severe off-target effects on vision.