• 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 IGHMBP2 gene is associated with autosomal recessive distal hereditary motor neuropathy 6, also known as spinal muscular atrophy with respiratory distress 1 (SMARD1) (MedGen UID: 388083) and Charcot-Marie-Tooth disease type 2S (CMT2S) (MedGen UID: 830572).

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Invitae tests that include this gene:

Pathogenic variants in IGHMBP2 cause an estimated 33% of cases of SMARD and an unknown percentage of CMT.

IGHMBP2 encodes an an enzyme named immunoglobulin μ-binding protein 2. This enzyme is a helicase and unwinds DNA during replication.

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
IGHMBP2 NM_002180.2