The RNU4-76P gene is part of a group of small nucleolar RNAs (snoRNAs) located in the nucleolus, primarily involved in the modification and biogenesis of ribosomal RNA (rRNA). Here's an in-depth discussion regarding the RNU4-76P gene, answering your requests:

### Summary of RNU4-76P Gene
- **Gene Symbol**: RNU4-76P
- **Type**: Small nucleolar RNA (snoRNA)
- **Function**: Primarily involved in the post-transcriptional modification of rRNA.

### 1. Associated Genes
While the specific associations with other genes are less frequently reported due to the primary focus being on core snoRNAs, small nucleolar RNAs often interact with the ribosomal RNA processing pathways and can be associated with genes involved in the pre-rRNA processing and modification machinery. Specific genes can include:
- **NOP56**: A nucleolar protein that participates in rRNA processing and is likely to interact with snoRNAs.
- **NOP58**: Another nucleolar protein that associates with the spliceosome and may be involved in the assembly of snoRNPs (small nucleolar ribonucleoproteins).

### 2. Aging and Age-Related Diseases
The involvement of RNU4-76P specifically with aging or age-related diseases is not extensively researched. However, generally, snoRNAs have been implicated in cellular homeostasis, ribosome biogenesis, and mRNA processing, which are critical components of cellular aging. Dysregulation of snoRNA expression has been associated with various pathologies, including certain age-related diseases, although a direct link between RNU4-76P and specific age-related diseases remains to be clearly established.

### 3. Drug Interactions
RNU4-76P itself does not have known drugs or drug classes that specifically interact with it, as it is not a protein-coding gene but rather an RNA gene. However, pharmacological agents targeting the processes related to ribosome biogenesis and RNA modification could indirectly impact the function of snoRNAs, including RNU4-76P. It is important to note that the research on targeting snoRNAs with drugs is still an emerging domain.

### 4. Pathways and Biological Processes
RNU4-76P is involved in:
- **Ribosomal RNA Processing**: RNU4-76P functions as a guide RNA for the modification and processing of rRNA.
- **Nucleotide Modification**: It plays a role in the chemical modification of uridines in pre-rRNA.
- **SnoRNA-mediated modifications**: RNU4-76P is involved in the broader category of processes where snoRNAs guide the modification of ribosomal RNA molecules.

### Conclusion
RNU4-76P is part of a larger family of snoRNAs that participate in crucial cellular functions, mainly the modification and processing of rRNA. While direct connections to aging, age-related diseases, and specific drugs remain limited, understanding the roles of snoRNAs in cellular integrity is vital for future research in these areas. Further studies may open new avenues for understanding the implications of RNU4-76P in health and disease.