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Alport Syndrome via the COL4A5 Gene

Summary and Pricing

Test Method

Sequencing and CNV Detection via NextGen Sequencing using PG-Select Capture Probes
Test Code Test Copy GenesTest CPT Code Gene CPT Codes Copy CPT Codes Base Price
3053 COL4A5 81408 81408,81407 $640 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
3053COL4A581408 81407(x1), 81408(x1) $640 Order Options and Pricing

Pricing Comments

This test is also offered via our exome backbone with CNV detection (click here). The exome-based test may be higher priced, but permits reflex to the entire exome or to any other set of clinically relevant genes.

An additional 25% charge will be applied to STAT orders. STAT orders are prioritized throughout the testing process.

Turnaround Time

18 days on average for standard orders or 13 days 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.

EMAIL CONTACTS

Genetic Counselors

Geneticist

  • Angela Gruber, PhD

Clinical Features and Genetics

Clinical Features

Alport Syndrome (AS) is a hereditary nephritis caused by defects of the collagen type IV protein, which is responsible for basement membrane formation in the kidney, ear and eye. The disease affects approximately 1 in 50000 individuals and is characterized by progressive renal failure, sensorineural hearing loss and eye abnormalities. The most common symptoms include persistent microhematuria at early childhood, progressive proteinuria, bilateral high frequency sensorineural hearing loss and anterior lenticonus in late childhood and adolescence. Approximately 80% of cases of the disease display X-linked inheritance. Almost all X-linked male patients will reach the end stage of renal failure by age 40, whereas female patients may only manifest hematuria (Lemmink et al. 1997; Hertz et al. 2001; Nagel et al. 2005; Hertz. 2009; Kashtan 2010).

Genetics

Alport syndrome can be caused by mutations in COL4A3, COL4A4 and COL4A5. The X-linked Alport syndrome is caused by mutations in the COL4A5 gene. The COL4A5 gene encodes alpha-5 chain of type IV collagen, a major structural component of basement membranes. Mutations in the COL4A5 gene explain approximately 90% of clinically diagnosed X-linked Alports syndrome. To date, more than 600 causative mutations were reported throughout the gene including missense (~35%), truncating (~30%), splicing (15%) and large del/dup (~20%). Large deletions involving 5’ ends of the COL4A5 gene and a breakpoint within the intron 2 of the COL4A6 gene were reported to cause diffuse leiomyomatosis. Glycine substitutions in Gly-Xaa-Yaa repeat sequence in the collagenous domain account for 85% of the missense mutations (Hertz 2009).

Clinical Sensitivity - Sequencing with CNV PG-Select

A large panel study showed that the overall detection rate is 53%, and a likely causative mutation was identified in 82% (23/28) of families with clear X-linked cases (Hertz 2009).

Testing Strategy

This test provides full coverage of all coding exons of the COL4A5 gene, plus ~10 bases of flanking noncoding DNA. We define full coverage as >20X NGS reads or Sanger sequencing.

Indications for Test

Candidates for this test are patients with symptoms consistent with X-linked Alport syndrome and the family members of patients who have known COL4A5 mutations.

Gene

Official Gene Symbol OMIM ID
COL4A5 303630
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Disease

Name Inheritance OMIM ID
Alport Syndrome, X-Linked Recessive XL 301050

Citations

  • Hertz et al. Detection of mutations in the COL4A5 gene by SSCP in X-linked Alport syndrome. Hum Mutat 18(2):141-8, 2001. PubMed ID: 11462238
  • Hertz JM. 2009. Alport syndrome. Molecular genetic aspects. Dan Med Bull 56: 105–152. PubMed ID: 19728970
  • Kashtan CE. 2013. Alport Syndrome and Thin Basement Membrane Nephropathy. In: Pagon RA, Adam MP, Ardinger HH, Bird TD, Dolan CR, Fong C-T, Smith RJ, and Stephens K, editors. GeneReviews(®), Seattle (WA): University of Washington, Seattle. PubMed ID: 20301386
  • Lemmink et al. The clinical spectrum of type IV collagen mutations. Hum Mutat 9(6): 477-499, 1997. PubMed ID: 9195222
  • Nagel et al. Novel COL4A5, COL4A4, and COL4A3 mutations in Alport syndrome. Hum Mutat  26(1): 60. 2005. PubMed ID: 15954103

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


Specimen Types

Specimen Requirements and Shipping Details

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ORDER OPTIONS

View Ordering Instructions

1) Select Test Method (Backbone)


1) Select Test Type


2) Select Additional Test Options

STAT and Prenatal Test Options are not available with Patient Plus.

No Additional Test Options are available for this test.

Note: acceptable specimen types are whole blood and DNA from whole blood only.
Total Price: $
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