About APC
The APC gene (APC Regulator of WNT Signaling) on chromosome 5q22 Germline truncating mutations in the mutation cluster region (MCR, codons 1286–1513) cause familial adenomatous polyposis and drive colorectal carcinogenesis. Key targets include Exons 1–15 (MCR in exon 15) for comprehensive mutation screening.
Mutations: Truncating mutations codon 1309, 1061, 1114 | GC content: 47% | Target exons: Exons 1–15 (MCR in exon 15)
APC Primer Design Challenges
- Large exon 15: Exon 15 spans 6.5 kb containing the mutation cluster region, requiring tiled amplicon design for full coverage
- Low GC content (47%): AT-rich intronic regions affect primer Tm uniformity, especially in introns 3–8
- Repetitive Alu elements: APC introns contain dense Alu repeat clusters that complicate exon-spanning primer placement
Recommended Primer Design Parameters for APC
| Parameter | Standard Exons | Optimized Regions |
|---|---|---|
| Primer length | 20–22 nt | 22–25 nt |
| GC content | 45–55% | 50–60% |
| Tm | 58–62°C | 60–65°C |
| Amplicon size | 150–300 bp | 180–350 bp |
| Annealing temp | 58–60°C | 60–64°C (touchdown) |
| PCR additive | Standard | Optional 3–5% DMSO for problematic regions |
Recommended Primer Sequences for APC
| Target Region | Forward Primer (5′→3′) | Reverse Primer (5′→3′) | Amplicon |
|---|---|---|---|
| Exon 15 (MCR region 1) | 5′-CCTGCAAATCCAGAACACCC-3′ | 5′-GCTGGGATTTGGTTCTAGGG-3′ | 220 bp |
| Exon 15 (MCR region 2) | 5′-AGGGTTCTAGTTTATCTTCA-3′ | 5′-CCATTCCATTCCATTCCATT-3′ | 248 bp |
Key SNPs to Avoid in Primer Binding Sites
When designing APC primers, avoid these clinically significant variants:
- rs1801155 (D1822V) — Exon 15 common polymorphism
- rs121913329 (Q1331*) — Premature stop in MCR region
Clinical Validation Required
All APC primers designed with VigyanLLM are for research use only. Clinical diagnostic applications require additional wet-lab validation, Sanger sequencing confirmation, and regulatory approval before patient use.
Design APC Primers Now
Pre-configured with APC-specific parameters. Use our primer design, Tm calculator, and GC content tools for optimal results.