Here is a detailed overview of the FTCDNL1 gene, incorporating the additional aspects you requested:

### Gene Overview
- **Gene Symbol**: FTCDNL1 (Folate Decarboxylase-Like 1)
- **Predicted Function**: FTCDNL1 is predicted to have folic acid binding activity and transferase activity, suggesting a potential role in the metabolism of folates, which are crucial for various biochemical pathways, including nucleotide synthesis and methylation processes.

### Gene Expression
- **Tissue Distribution**: FTCDNL1 is widely expressed, with the highest expression levels observed in the liver and skeletal muscle. Moderate levels of expression are seen in the kidney, bone, and pancreas.

### Associated Genes
While specific gene associations can vary based on research context, FTCDNL1 has been implicated in pathways related to metabolism and gene regulation. Related genes that may function in similar pathways or share regulatory elements include:
- **FOLR1** (Folate receptor 1), which is part of the folate transport system and metabolism.
- **MTHFR** (Methylenetetrahydrofolate reductase), which plays a critical role in the metabolism of folate.

Note: Specific databases, such as STRING or BioGRID, can provide additional gene interactions if any functional or physical interactions are documented.

### Aging and Age-Related Diseases
Currently, there may be limited direct evidence linking FTCDNL1 specifically to aging or age-related diseases. However, aberrations in folate metabolism have been implicated in various conditions often associated with aging, such as:
- **Cardiovascular diseases**: Due to the connection between folate levels, homocysteine metabolism, and cardiovascular health.
- **Neurological disorders**: A deficiency in folate is often seen in neurodegenerative diseases, which are more prevalent with aging.

Further research is needed to ascertain the specific role FTCDNL1 may have in these processes.

### Drug Interactions
There are no specific drugs or drug classes listed directly interacting with the FTCDNL1 gene; however, as its function may be related to folate metabolism, folic acid supplements and related compounds (e.g., methotrexate, which inhibits folate metabolism) may indirectly impact the pathways in which FTCDNL1 is involved.

### Pathways and Biological Processes
- **Biological Processes**: FTCDNL1 is likely involved in metabolic processes related to folate metabolism, potentially influencing:
  - **Nucleotide biosynthesis**: Participation in de novo synthesis pathways for purine and pyrimidine synthesis.
  - **One-carbon metabolism**: This is critical for methylation processes, which can influence gene expression and DNA repair.

- **Biochemical Pathways**: Although specific pathways directly including FTCDNL1 have not been extensively characterized, its involvement in folate metabolism may link it to folate-related pathways, such as the:
  - **Folate-Associated One-Carbon Metabolism Pathway**: This involves various enzymes and transporters responsible for the utilization and transfer of methyl groups, essential for numerous biochemical processes.

### Conclusion
FTCDNL1 is a gene of interest, primarily predicted to interact with folate metabolism. Its roles in aging, drug interactions, and specific biological pathways require further in-depth studies to establish definitive associations. Continued research is necessary to delineate the complete functional landscape of FTCDNL1 and its implications in health and disease.