• Turnaround time:
    10–21 calendar days (14 days on average)
  • Preferred specimen:
    3mL whole blood in a purple-top tube
  • Alternate specimens:
    DNA or saliva/assisted saliva
  • Sample requirements
  • Request a sample kit




Associated disorders

The JAK3 gene is associated with autosomal recessive severe combined immunodeficiency (MedGen UID: 331474).

An estimated 6% – 7% of severe combined immunodeficiency (SCID) is caused by pathogenic variants identified in JAK3 (PMID: 9063412, 25138334).

JAK3 encodes a protein which is a member of the Janus kinase (JAK) family of tyrosine kinases. JAK3 is expressed mostly in immune cells and it is involved in a cytokine-mediated intracellular signal transduction pathway. It is activated via tyrosine phosphorylation by interleukin receptors and then it transduces the signal which results in the translocation of dimerized STAT5 protein to the nucleus where it induces transcription of target genes (PMID: 26235889).

Assay and technical information

Invitae is a College of American Pathologists (CAP)-accredited and Clinical Laboratory Improvement Amendments (CLIA)-certified clinical diagnostic laboratory performing full-gene sequencing and deletion/duplication analysis using next-generation sequencing technology (NGS).

Our sequence analysis covers clinically important regions of each gene, including coding exons, +/- 10 base pairs of adjacent intronic sequence in the transcript listed below. In addition, analysis covers the select non-coding variants specifically defined in the table below. Any variants that fall outside these regions are not analyzed. Any specific limitations in the analysis of these genes are also listed in the table below.

Our analysis detects most intragenic deletions and duplications at single exon resolution. However, in rare situations, single-exon copy number events may not be analyzed due to inherent sequence properties or isolated reduction in data quality. If you are requesting the detection of a specific single-exon copy number variation, please contact Client Services before placing your order.

Gene Transcript reference Sequencing analysis Deletion/Duplication analysis
JAK3 NM_000215.3