AMD-associated genes encoding stress-activated MAPK pathway constituents are identified by interval-based enrichment...

Area of Science:

• Genetics
• Molecular Biology
• Ophthalmology

Background:

• Advanced age-related macular degeneration (AAMD) is a leading cause of vision loss.
• The genetic underpinnings of AAMD are complex and not fully understood.
• Mitogen-activated protein kinase (MAPK) signaling pathways are involved in cellular stress responses.

Purpose of the Study:

• To investigate the association between common DNA sequence variants in stress-activated MAPK signaling pathways and AAMD.
• To determine if aggregated gene variants within these pathways are linked to AAMD development.

Main Methods:

• Utilized meta-regression and exact testing on data from 1177 AAMD patients and 1024 controls.
• Employed a multi-locus testing method (INRICH) to assess gene enrichment in five MAPK pathway gene sets.
• Analyzed single nucleotide polymorphisms (SNPs) within AAMD-associated genomic intervals.

Main Results:

• Four of five tested MAPK pathway gene sets showed enrichment with AAMD-associated SNPs.
• The strongest association was found in the c-Jun N-terminal kinase (JNK)/MAPK cascade (P=0.006).
• Specific variants were identified in genes including MAP3K4, MAP3K5, MAP3K9, JNK3A1, NR2C2, PPP3CA, TGFB2, and TGFBR2.

Conclusions:

• Genomic enrichment analysis revealed significant associations between AAMD and aggregated genes in the JNK MAPK signaling pathway.
• The findings suggest that targeting stress-activated MAPK pathways could be a viable strategy for AAMD prevention or treatment.
• Existing FDA-approved drugs targeting these pathways may offer therapeutic potential for AAMD.