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  • 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
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ALS2

Alias

ALS2CR6; ALSJ; IAHSP; PLSJ

Associated disorders

The ALS2 gene is associated with a spectrum of autosomal recessive conditions: infantile-onset ascending hereditary spastic paraplegia (IAHSP) (MedGen UID: 335467), juvenile primary lateral sclerosis (JPLS) (MedGen UID: 342870), and juvenile amyotrophic lateral sclerosis 2 (ALS2) (MedGen UID: 349246).

ALS2 causes a rare subtype of HSP, infantile-onset ascending hereditary spastic paraplegia (IAHSP). An estimated 40% of IAHSP is caused by variants identified in ALS2.

The ALS2 gene encodes a protein that contains an ATS1/RCC1-like domain, a RhoGEF domain, and a vacuolar protein sorting 9 (VPS9) domain, all of which are guanine-nucleotide exchange factors that activate members of the Ras superfamily of GTPases. The protein functions as a guanine nucleotide exchange factor for the small GTPase RAB5. The protein localizes with RAB5 on early endosomal compartments, and functions as a modulator for endosomal dynamics.

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
ALS2 NM_020919.3