Associated disorders

The TPM2 gene is associated with autosomal dominant nemaline myopathy 4 (NEM4) (MedGen UID: 324513) and congenital myopathy with fiber-type disproportion (CFTD) (MedGen UID: 108177). Other TPM2-related conditions have been reported (OMIM: 190990).

TPM2 accounts for <1% of nemaline myopathy.

TPM2 encodes beta-tropomyosin which is preferentially expressed in type I (slow) muscle fibers. Tropomyosins bind actin and stabilize the sarcomeric thin filament and regulate muscle contraction. Beta-tropomyosin serves to block the actin-myosin interaction in the relaxed state.

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
TPM2 NM_003289.3