Associated disorders

The PLP1 gene is associated with a spectrum of X-linked conditions, ranging from X-linked hereditary spastic paraplegia 2 (SPG2) (MedGen UID: 374177) to Pelizaeus-Merzbacher disease (PMD) (MedGen UID: 61440).

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Invitae tests that include this gene:

While the percentage of HSP attribed to pathogenic variants in PLP1 is unkown, approximately 7%-8% of inherited leukodystrophies are attributed to PLP1.

The PLP1 gene encodes proteolipid protein 1 as well as an alternatively spliced isoform referred to as DM20. These proteins are primarily expressed in the central nervous system and are two of the main components of myelin.

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
PLP1 NM_000533.4