The CWC15 gene encodes a protein that plays a crucial role in pre-mRNA splicing as part of the spliceosome, particularly in the U2-type spliceosome and the minor spliceosome. Its functions are vital for proper gene expression and processing of introns, particularly those found in U12-type introns.

### 1. Associated Genes
The CWC15 gene is known to interact with several other genes involved in RNA splicing and spliceosome assembly. Some important interacting genes and complexes include:
- **PRP19**: A protein involved in the spliceosome function and the activation of pre-mRNA splicing.
- **CDC5L**: A protein that interacts with CWC15 as part of the PRP19-CDC5L complex in the spliceosome.
- **U2AF**: This is another component of the splicing machinery that has been associated with CWC15 function.
- **RBMX**: An RNA-binding protein that may also associate with CWC15 in the context of splicing.

### 2. Aging and Age-related Diseases
While direct research specifically linking CWC15 to aging or age-related diseases may be limited, RNA splicing and the proper functioning of the spliceosome play critical roles in cellular function, and errors in RNA splicing have been implicated in various age-related diseases. Dysregulation of splicing has been associated with:
- Neurodegenerative diseases (e.g., Alzheimer’s disease, Parkinson’s disease)
- Cancer, where alternative splicing can lead to oncogenic protein variants.
- Age-related decline in cellular function, suggesting that maintaining proper splicing activities could be implicated in healthier aging.

### 3. Drug Interactions
Currently, specific drugs that directly interact with the CWC15 gene or its protein product are not well-defined in the literature. However, drugs that target the spliceosome as a whole or that affect general RNA splicing pathways could theoretically affect CWC15 function. These could include:
- **Antisense oligonucleotides**: used in therapeutic applications aiming to correct splicing errors.
- **Splicing modulators or inhibitors**: like some investigational compounds that have implications in cancer therapy.
- **Chemotherapeutic agents**: that have been shown to influence splicing factors or machinery indirectly.

### 4. Pathways and Biological Processes
CWC15 is involved in several critical biological processes and pathways:
- **mRNA Splicing**: Specifically, it is integral in both major (U2-type) and minor (U12-type) spliceosomal systems.
- **Spliceosome Assembly**: CWC15 participates in the formation of the spliceosome complex, which is required for the accurate removal of introns from pre-mRNA.
- **RNA Processing**: The gene plays a role in various RNA processing activities, contributing to the maturation of mRNA.
- **Cell Cycle Regulation**: Given its role in mRNA splicing, CWC15 may indirectly influence cell cycle progression through the regulation of genes involved in cell division.

In summary, CWC15 is critically involved in RNA splicing and spliceosome assembly, collaborating with various proteins and potentially influencing aging and disease through its essential functions in gene expression regulation. Further research could elucidate its specific roles in these contexts and any therapeutic implications related to its function.