The PPP4R1-AS1 gene, also known as PPP4R1 antisense RNA 1, is a long non-coding RNA (lncRNA) that is involved in various biological processes. Building on the summaries provided by NCBI and UniProt, here are additional insights:

### 1. Associated Genes:
PPP4R1-AS1 may be associated with several genes and regulatory networks, notably:
- **PPP4R1**: This gene encodes a regulatory subunit of protein phosphatase 4, which is involved in several cellular processes including response to DNA damage and cell cycle regulation.
- **PPP4C**: Encodes the catalytic subunit of protein phosphatase 4, which is functionally linked to PPP4R1.
- **Various cancer-related genes**: lncRNAs, including PPP4R1-AS1, often exhibit interactions with genes implicated in cancer due to their regulatory roles.

### 2. Aging and Age-Related Diseases:
Research on PPP4R1-AS1 specific to aging or age-related diseases is limited; however, the overall role of lncRNAs in regulating cellular processes like stress responses and cell cycle progression suggests that PPP4R1-AS1 could potentially affect aging. There may be links to:
- **Cellular senescence**: By modulating regulatory pathways and gene expression, it might play a role in the onset of cellular aging.
- **Cancer**: Since aging is a significant risk factor for many cancers, its association with cancer-related pathways may indirectly connect it with age-related disease processes.

### 3. Drug Interactions:
Currently, there are no specific drugs or drug classes directly known to interact with PPP4R1-AS1 under standard pharmaco-genomic studies. However, since this gene is involved in cellular signaling pathways that may be targeted in cancer therapies, it could potentially influence drug effectiveness in certain contexts. Research into its role in diseases could reveal more about possible interactions.

### 4. Pathways and Biological Processes:
PPP4R1-AS1 is implicated in a variety of biological processes and pathways, including but not limited to:
- **Cell cycle regulation**: It may participate in controlling cell proliferation and survival through its regulatory aspects.
- **DNA damage response**: Given the association with PPP4 family members, it could have a role in the cellular response to DNA damage and repair mechanisms.
- **Regulation of gene expression**: As a lncRNA, it is likely involved in modulating transcriptional activity, including the transcription of other genes, which can impact a wide range of biological outcomes.

In summary, while there is much still to uncover regarding PPP4R1-AS1, its contributions to gene regulation, potential implications for aging and age-related diseases, and association with critical genes in signaling pathways present significant avenues for research.