About JAK3
The JAK3 gene (Janus Kinase 3) on chromosome 19p13 Loss-of-function JAK3 mutations cause severe combined immunodeficiency (SCID), while gain-of-function mutations occur in T-cell leukemia/lymphoma. Key targets include Exons 2–24 (JH1–JH7 domains) for comprehensive mutation screening.
Mutations: L156P, A573V, V715I, M511I | GC content: 49% | Target exons: Exons 2–24 (JH1–JH7 domains)
JAK3 Primer Design Challenges
- Dual phenotype spectrum: Gain-of-function (leukemia) vs loss-of-function (SCID) mutations span different domains requiring full-gene coverage
- Moderate-to-low GC (49%): Slightly AT-rich with repetitive elements in introns 4–8 requiring BLAST specificity checks
- Pseudokinase domain homology: JAK3 pseudokinase domain has moderate homology with JAK2 requiring family-specific primer design
Recommended Primer Design Parameters for JAK3
| 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 JAK3
| Target Region | Forward Primer (5′→3′) | Reverse Primer (5′→3′) | Amplicon |
|---|---|---|---|
| Exon 4 (FERM domain) | 5′-CCGCTGGATCCCTGAATACA-3′ | 5′-TCCAGACACACCTGCAGTTT-3′ | 162 bp |
| Exon 16 (kinase) | 5′-GTGCCCACCTTCAGCTTAAC-3′ | 5′-GACACAGCTTGAGCCTCACT-3′ | 198 bp |
Key SNPs to Avoid in Primer Binding Sites
When designing JAK3 primers, avoid these clinically significant variants:
- rs121913501 (L156P) — Exon 4 FERM domain mutation in SCID
- rs3213409 (A573V) — Exon 12 pseudokinase domain variant
- rs147552587 (V715I) — Exon 16 kinase domain mutation
Clinical Validation Required
All JAK3 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 JAK3 Primers Now
Pre-configured with JAK3-specific parameters. Use our primer design, Tm calculator, and GC content tools for optimal results.