Steroid-Resistant Nephrotic Syndrome and Coenzyme Q10 Deficiency via the COQ6 Gene
Summary and Pricing 
Test Method
Exome Sequencing with CNV Detection
| Test Code | Test Copy Genes | Test CPT Code | Gene CPT Codes Copy CPT Code | Base Price | |
|---|---|---|---|---|---|
| 8317 | COQ6 | 81479 | 81479,81479 | $990 | Order Options and Pricing |
Pricing Comments
Our favored testing approach is exome based NextGen sequencing with CNV analysis. This will allow cost effective reflexing to PGxome or other exome based tests. However, if full gene Sanger sequencing is desired for STAT turnaround time, insurance, or other reasons, please see link below for Test Code, pricing, and turnaround time information. If the Sanger option is selected, CNV detection may be ordered through Test #600.
An additional 25% charge will be applied to STAT orders. STAT orders are prioritized throughout the testing process.
Click here for costs to reflex to whole PGxome (if original test is on PGxome Sequencing platform).
Click here for costs to reflex to whole PGnome (if original test is on PGnome Sequencing platform).
The Sanger Sequencing method for this test is NY State approved.
For Sanger Sequencing click here.Turnaround Time
3 weeks on average for standard orders or 2 weeks on average for STAT orders.
Please note: Once the testing process begins, an Estimated Report Date (ERD) range will be displayed in the portal. This is the most accurate prediction of when your report will be complete and may differ from the average TAT published on our website. About 85% of our tests will be reported within or before the ERD range. We will notify you of significant delays or holds which will impact the ERD. Learn more about turnaround times here.
Targeted Testing
For ordering sequencing of targeted known variants, go to our Targeted Variants page.
Clinical Features and Genetics
Clinical Features
Nephrotic syndrome is a genetically heterogeneous disease defined by proteinuria, hypoalbuminemia, hyperlipidemia, and edema (Benoit et al. 2010; Santín et al. 2011; Saleem 2012). Approximately 20% of cases are steroid-resistant nephrotic syndrome (SRNS), characterized by resistance to steroid treatment and rapid progression to end-stage renal failure. The prevalent histological feature of SRNS is focal segmental glomerulosclerosis (FSGS), which has been seen in approximately 60% of SRNS cases. Diffuse mesangial sclerosis (DMS) is the other important histological feature associated with SRNS. The clinical courses of SRNS vary greatly with a wide range of age at onset from birth to adulthood.
Recessive mutations in the COQ6 gene cause early-onset SRNS with sensorineural deafness through Coenzyme Q10 deficiency (Heeringa et al. 2011). Early diagnosis is important because it may represent a form of SRNS that can potentially be treated by CoQ10 supplementation.
Genetics
COQ6-associated SRNS is an autosomal recessive disorder (Heeringa et al. 2011). The COQ6 gene encodes coenzyme Q10 biosynthesis monooxygenase 6. So far, genetic defects of COQ6 found in SRNS include missense, nonsense mutations and small deletion/insertions (Human Gene Mutation Database). Exon-level large deletions involving COQ6 have not been reported.
All of proteins encoded by SRNS-associated genes are localized to the podocytes, which are essential in maintaining the glomerular filtration barrier. Regarding protein function and location in podocytes, COQ6 belongs to mitochondrial proteins (Malaga-Dieguez et al. 2013).
Clinical Sensitivity - Sequencing with CNV PGxome
Detection rate of pathogenic variants in the COQ6 gene in a large cohort of patients with SRNS is unknown in the literature because documented COQ6 pathogenic variants have only been reported in limited cases. Analytical sensitivity should be high as all reported mutations are detectable by sequencing.
Testing Strategy
This test provides full coverage of all coding exons of the COQ6 gene plus 10 bases of flanking noncoding DNA in all available transcripts along with other non-coding regions in which pathogenic variants have been identified at PreventionGenetics or reported elsewhere. We define full coverage as >20X NGS reads or Sanger sequencing. PGnome panels typically provide slightly increased coverage over the PGxome equivalent. PGnome sequencing panels have the added benefit of additional analysis and reporting of deep intronic regions (where applicable).
Dependent on the sequencing backbone selected for this testing, discounted reflex testing to any other similar backbone-based test is available (i.e., PGxome panel to whole PGxome; PGnome panel to whole PGnome).
Indications for Test
Candidates for this test are patients with SRNS with sensorineural deafness and CoQ10 biosynthesis disruption. Testing is also indicated for family members of patients who have known mutations in the COQ6 gene. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in COQ6.
Candidates for this test are patients with SRNS with sensorineural deafness and CoQ10 biosynthesis disruption. Testing is also indicated for family members of patients who have known mutations in the COQ6 gene. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in COQ6.
Gene
| Official Gene Symbol | OMIM ID |
|---|---|
| COQ6 | 614647 |
| Inheritance | Abbreviation |
|---|---|
| Autosomal Dominant | AD |
| Autosomal Recessive | AR |
| X-Linked | XL |
| Mitochondrial | MT |
Disease
| Name | Inheritance | OMIM ID |
|---|---|---|
| Coenzyme Q10 deficiency, primary, 6 | AR | 614650 |
Related Test
| Name |
|---|
| Steroid-Resistant Nephrotic Syndrome and Coenzyme Q10 Deficiency via the COQ2 Gene |
Citations
- Benoit G. et al. 2010. Pediatric Nephrology (berlin, Germany). 25: 1621-32. PubMed ID: 20333530
- Heeringa SF, Chernin G, Chaki M, Zhou W, Sloan AJ, Ji Z, Xie LX, Salviati L, Hurd TW, Vega-Warner V, Killen PD, Raphael Y, Ashraf S, Ovunc B, Schoeb DS, McLaughlin HM, Airik R, Vlangos CN, Gbadegesin R, Hinkes B, Saisawat P, Trevisson E, Doimo M, Casarin A, Pertegato V, Giorgi G, Prokisch H, Rötig A, Nürnberg G, Becker C, Wang S, Ozaltin F, Topaloglu R, Bakkaloglu A, Bakkaloglu SA, Müller D, Beissert A, Mir S, Berdeli A, Varpizen S, Zenker M, Matejas V, Santos-Ocaña C, Navas P, Kusakabe T, Kispert A, Akman S, Soliman NA, Krick S, Mundel P, Reiser J, Nürnberg P, Clarke CF, Wiggins RC, Faul C, Hildebrandt F. 2011. COQ6 mutations in human patients produce nephrotic syndrome with sensorineural deafness. J. Clin. Invest. 121: 2013–2024. PubMed ID: 21540551
- Human Gene Mutation Database (Bio-base).
- Malaga-Dieguez L, Susztak K. 2013. ADCK4 “reenergizes” nephrotic syndrome. J. Clin. Invest. 123: 4996–4999. PubMed ID: 24270414
- Saleem M.A. 2013. Pediatric Nephrology (berlin, Germany). 28: 699-709. PubMed ID: 22782578
- Santín S. et al. 2011. Clinical Journal of the American Society of Nephrology : Cjasn. 6: 1139-48. PubMed ID: 21415313
Ordering/Specimens
Ordering Options
We offer several options when ordering sequencing tests. For more information on these options, see our Ordering Instructions page. To view available options, click on the Order Options button within the test description.
myPrevent - Online Ordering
- The test can be added to your online orders in the Summary and Pricing section.
- Once the test has been added log in to myPrevent to fill out an online requisition form.
- PGnome sequencing panels can be ordered via the myPrevent portal only at this time.
Requisition Form
- A completed requisition form must accompany all specimens.
- Billing information along with specimen and shipping instructions are within the requisition form.
- All testing must be ordered by a qualified healthcare provider.
For Requisition Forms, visit our Forms page
If ordering a Duo or Trio test, the proband and all comparator samples are required to initiate testing. If we do not receive all required samples for the test ordered within 21 days, we will convert the order to the most effective testing strategy with the samples available. Prior authorization and/or billing in place may be impacted by a change in test code.
Specimen Types
Specimen Requirements and Shipping Details
PGxome (Exome) Sequencing Panel
PGnome (Genome) Sequencing Panel
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ORDER OPTIONS
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2) Select Additional Test Options
No Additional Test Options are available for this test.