• 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 NEFL gene is associated with autosomal dominant Charcot-Marie-Tooth disease type 2E (CMT2E) (MedGen UID: 375127) and type 1F (CMT1F) (MedGen UID: 334337). There is some evidence for recessive inheritance as well (PMID: 20039262).

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Invitae tests that include this gene:

An estimated 4% of CMT2 and an unknown but small percetage of CMT1 are caused by variants in NEFL.

The gene NEFL encodes the light chain neurofilament protein. This neurofilament component is used to make the internal scaffolding that give neurons their characteristic size and shape. More specifically, NEFL helps the neuron maintain the right axon diameter, a feature required for transmission of nerve impulses.

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
NEFL NM_006158.4