About KDR
The KDR gene (Kinase Insert Domain Receptor (VEGFR2)) on chromosome 4q12 KDR polymorphisms (Q472H, V297I) influence VEGF signaling and may affect anti-angiogenic therapy response in colorectal and renal cancers. Key targets include Exons 11–26 (kinase domain) for comprehensive mutation screening.
Mutations: Q472H, V297I, H472Q | GC content: 56% | Target exons: Exons 11–26 (kinase domain)
KDR Primer Design Challenges
- Q472H polymorphism: The common Q472H variant in exon 11 affects VEGF binding and requires genotype-aware primer placement
- Elevated GC (56%): Exons 18–22 in the kinase insert region show high GC content requiring denaturant optimization
- Large extracellular domain: Seven immunoglobulin-like domains (exons 2–10) add complexity for full-length transcript amplification
Recommended Primer Design Parameters for KDR
| 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 KDR
| Target Region | Forward Primer (5′→3′) | Reverse Primer (5′→3′) | Amplicon |
|---|---|---|---|
| Exon 11 (Q472H) | 5′-CATCCACAGACTCCTAAGGG-3′ | 5′-TCACTGGCAGACTGTCTGTG-3′ | 192 bp |
| Exon 19 (kinase insert) | 5′-GAGCAAGCTCGTCAATGGAC-3′ | 5′-AGGTAGCGTGGTTGTGACAT-3′ | 208 bp |
Key SNPs to Avoid in Primer Binding Sites
When designing KDR primers, avoid these clinically significant variants:
- rs1870377 (Q472H) — Exon 11 Ig-like domain 7 polymorphism
- rs2305948 (V297I) — Exon 7 Ig-like domain 4 variant
Clinical Validation Required
All KDR 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 KDR Primers Now
Pre-configured with KDR-specific parameters. Use our primer design, Tm calculator, and GC content tools for optimal results.