About IDH1
The IDH1 gene (Isocitrate Dehydrogenase (NADP(+)) 1) on chromosome 2q34 R132 hotspot mutations produce the oncometabolite 2-hydroxyglutarate, causing DNA hypermethylation and blocking differentiation in glioma and AML. Key targets include Exons 4–11 (active site in exon 4) for comprehensive mutation screening.
Mutations: R132H, R132C, R132S, R132G | GC content: 62% | Target exons: Exons 4–11 (active site in exon 4)
IDH1 Primer Design Challenges
- High GC content (62%): Elevated GC across exon 4 and flanking introns requires 5–10% DMSO for robust amplification of the R132 hotspot
- Single-codon dominance: R132 mutations account for>90% of all IDH1 mutations, enabling focused amplicon design
- Oncometabolite correlation: Distinguishing R132H vs R132C variants by sequencing requires high-resolution amplicon design avoiding GC bias
Recommended Primer Design Parameters for IDH1
| Parameter | Standard Exons | GC-Rich Regions (≥58%) |
|---|---|---|
| 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 | Add 5–10% DMSO or betaine |
Recommended Primer Sequences for IDH1
| Target Region | Forward Primer (5′→3′) | Reverse Primer (5′→3′) | Amplicon |
|---|---|---|---|
| Exon 4 (R132) | 5′-GGCTCTGAGGGACGTATCTG-3′ | 5′-GCTGTCAGTTCACACTGAGG-3′ | 198 bp |
| Exon 10 (NADP-binding) | 5′-CAGCCACAATCCTGACCTTT-3′ | 5′-GAGCAGTGTCACACTGTCCT-3′ | 185 bp |
Key SNPs to Avoid in Primer Binding Sites
When designing IDH1 primers, avoid these clinically significant variants:
- rs121913500 (R132H) — Exon 4 most common IDH1 mutation in glioma
- rs121913499 (R132C) — Exon 4 alternative transversion in AML
- rs121913502 (R132S) — Exon 4 rare substitution
Clinical Validation Required
All IDH1 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 IDH1 Primers Now
Pre-configured with IDH1-specific parameters. Use our primer design, Tm calculator, and GC content tools for optimal results.