• 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 NKX2-5 gene is associated with autosomal dominant tetralogy of Fallot (MedGen UID: 21498), conotruncal heart malformations (MedGen UID: 341803), hypoplastic left heart (MedGen UID: 482415), and atrial septal defect with or without atrioventricular conduction defects (MedGen UID: 400040). Additionally, the NKX2-5 gene has preliminary evidence supporting a correlation with autosomal dominant dilated cardiomyopathy (PMID: 23661673), atrial fibrillation (MedGen UID: 445), and congenital hypothyroidism (MedGen UID: 482425).

Pathogenic NKX2-5 variants are rare causes of tetralogy of Fallot, conotruncal heart malformations, hypoplastic left heart, and atrial septal defect with or without atrioventricular conduction defects. Additionally, pathogenic NKX2-5 variants are associated with an unknown percentage of clinical cases of dilated cardiomyopathy, atrial fibrillation, and congenital hypothyroidism.

The NKX2-5 gene encodes a homeobox-containing transcription factor, which functions in heart formation and development. NKX2-5 is expressed in early cardiac progenitor cells during embryogenesis and continues to be expressed in the heart throughout adulthood.

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, and select noncoding variants. Our assay provides a Q30 quality-adjusted mean coverage depth of 350x (50x minimum, or supplemented with additional analysis). Variants classified as pathogenic or likely pathogenic are confirmed with orthogonal methods, except individual variants that have high quality scores and previously validated in at least ten unrelated samples.

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
NKX2-5 NM_004387.3; NM_004387.3