Associated disorders

The ACTA1 gene is associated with autosomal dominant and recessive nemaline myopathy 3 (NEM3) (MedGen UID: 371799) and autosomal dominant congenital fiber-type disproportion (CFTD) (MedGen UID: 108177). Other ACTA1-related disorders have also been reported (OMIM: 102610).

ACTA1 accounts for approximately 15%-25% of nemaline myopathy. Pathogenic variants in ACTA1are more prevalent in severe neonatal-onset cases.

ACTA1 encodes alpha-actin, the main actin of skeletal muscle. Alpha-actin is found along the sarcomeric thin filament where it binds to thick filament myosin to generate contractile force. Alpha-actin binds many other proteins, notably nebulin, along the thin filament.

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
ACTA1 NM_001100.3