The NPHP4 gene is associated with autosomal recessive ciliopathies, including nephronophthesis type 4 (MedGen UID: 339667) and Senior-Loken syndrome type 4 (MedGen UID: 337697).
Primary cilia sense the extracellular environment and transmit signals into the cell for proper organ development and embryonic patterning. These cilia consist of a basal body, a transition zone, and an axoneme composed of nine peripheral microtubule doublets. Disruption of cilia function can lead to a variety of diseases associated with brain, kidney, lung, eye, digital, and/or facial anomalies. The NPHP4 gene encodes a transition-zone protein that establishes a ciliary gate to control protein entry into the cilia, and pathogenic variants in this gene lead to defects in ciliogenesis.
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|