The WDR74 gene, also known as "WD Repeat Domain 74," encodes a protein that plays crucial roles in ribonucleoprotein complex assembly and ribosome biogenesis, particularly in the maturation of the 60S ribosomal subunit. Below, I provide additional details on your requested topics concerning WDR74:

### 1. Other Associated Genes
WDR74 has been associated with several genes in the context of ribosome biogenesis and RNA processing pathways. Notably:
- **RRP7A**: Related to ribosomal RNA processing and exosome activity.
- **NVL (Nuclear Messenger RNA Surveillance Factor)**: This gene is particularly mentioned in connection with the pre-rRNA processing pathway.
- **RBM15**: Involved in RNA metabolism; may have interactions in similar pathways.
- **EIF2B genes**: Associated with translation initiation and ribosomal function.

### 2. Known Details Related to Aging or Age-Related Diseases
While specific aging studies focused explicitly on WDR74 may be limited, its primary role in ribosomal biogenesis and RNA processing is fundamentally linked to cellular homeostasis and function. Disruptions in these processes often lead to cellular dysfunction, a hallmark of aging. Additionally:
- **Cancer**: Abnormalities in ribosome biogenesis are often observed in various cancers. Mutations or misregulation of ribosomal proteins, including those involved in 60S subunit assembly, can contribute to oncogenic processes and age-related susceptibility to cancer.
- **Organismal Aging**: As cellular transcription, processing, and stability pathways become dysregulated with age, proteins like WDR74 may ultimately influence longevity and age-associated decline in cellular function.

### 3. Drug or Drug Classes Known to Interact with WDR74
While there may not be direct pharmacological agents that target WDR74 specifically, the following considerations apply:
- **Anticancer Therapies**: Given the role of WDR74 in ribosomal biogenesis, drugs impacting ribosome synthesis (like some antibiotics that target ribosomal functions) could indirectly affect WDR74’s activity. These include macrolides and aminoglycosides.
- **Small Molecule Modulators of RNA Processing**: Agents like spliceosome inhibitors or other RNA-targeting drugs might have regulatory effects in pathways where WDR74 is involved.

### 4. Pathways and Biological Processes Involved
WDR74 is primarily involved in several key biological processes and pathways:
- **Ribosome Biogenesis**: Crucial for the assembly and maturation of the ribosomal large subunit.
- **RNA Processing**: Integral to pre-rRNA processing especially in the context of the nucleolus and nucleoplasm.
- **Nuclear Exosome Complex Function**: Participates in RNA surveillance and degradation of unstable mRNAs.
- **Preimplantation Development**: Essential for transcription and processing necessary for early embryonic development, particularly during blastocyst formation.
- **Synthesis of Ribosomal RNA (rRNA)**: Specifically involved in early cleavage events of pre-rRNA.

### Conclusion
WDR74 plays a pivotal role in RNA processing and ribosome biogenesis, with implications in cellular aging, development, and disease. Its associations with various genes and its potential impact in cancer and other age-related conditions underscore its importance in cellular physiology. Further studies may elucidate additional interactors, pathways, and therapeutic implications.