DHPR; PKU2; SDR33C1
The QDPR gene is associated with autosomal recessive tetrahydrobiopterin-deficient hyperphenylalaninemia due to quinoid dihydropteridine reductase (DHPR) deficiency (MedGen UID: 75682).
Order this gene as a single gene test.
Invitae tests that include this gene:
An estimated 1-3% of hyperphenylalaninemia cases are due to defects in tetrahydrobiopterin metabolism. Of the 1-3% of cases, approximately 30% of them are due to quinoid dihydropteridine reductase deficiency (PMID: 19234759).
The QDPR gene encodes the enzyme quinoid dihydropteridine reductase; which catalyzes the NADH-mediated reduction of a quinonoid dihydrobiopterin to tetrahydrobiopterin (BH4). This is the second of two steps in the BH4 salvage pathway and following this reaction BH4 is available for reuse (PMID: 15171997).
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|