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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
  • Sample requirements
  • Request a sample kit
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ARX

Alias

CT121; EIEE1; ISSX; MRX29; MRX32; MRX33; MRX36; MRX38; MRX43; MRX54; MRX76; MRX87; MRXS1; PRTS

Associated disorders

The ARX gene is associated with X-linked recessive early infantile epileptic encephalopathy (MedGen UID: 483052), or West syndrome, and X-linked lissencephaly with ambiguous genitalia (XLAG) (MedGen UID: 375832).

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ARX

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ARX: Analysis is validated to detect polyalanine expansions but sensitivity may be reduced in heterozygous females. Family variant testing in female individuals is available when there is a confirmed expansion in a male relative.


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Invitae tests that include this gene:

Pathogenic variants in the ARX gene are associated with 5-8% of clinical cases of West and Ohtahara syndromes.

The ARX gene encodes a transcription factor that is essential for brain development in the embryo, particularly neural cell migration and differentiation (PMID: 20300201).

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
ARX* NM_139058.2


*ARX: Analysis is validated to detect polyalanine expansions but sensitivity may be reduced in heterozygous females. Family variant testing in female individuals is available when there is a confirmed expansion in a male relative.