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Usher Syndrome Type 1 and Deafness, Autosomal Recessive 18 (DFNB18) via the USH1C 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
4879 USH1C 81407 81407,81479 $990 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
4879USH1C81407 81407,81479 $990 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.

Testing run on PG-Select capture probes does not include exome-wide CNV analysis. Reflex is available to PGxome or an exome-based panel, or you can use this gene list to create a custom panel (click here).

Click here for costs to reflex to whole PGxome.

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.


Genetic Counselors


  • Ben Dorshorst, PhD

Clinical Features and Genetics

Clinical Features

Usher syndrome is a clinically heterogeneous disorder characterized by progressive retinitis pigmentosa (RP) and sensorineural hearing impairment, with or without vestibular abnormalities. Three types are recognized based on the age of onset, severity of symptoms, and the vestibular involvement. Usher syndrome type 1 (USH1) is the most common type. It is distinguished by congenital onset of hearing loss, RP in the first decade of life, and abnormal vestibular function (Cohen et al. Int J Audiol 46:82-93, 2007). Features of RP include night blindness progressing to constriction of the peripheral visual field with eventual loss of central vision, abnormal fundus with bone-spicule deposits/attenuated retinal vessels, and abnormal electroretinographic (ERG) findings (Daiger et al. Arch Ophthalmol 125:151-158, 2007). The vestibular abnormality results in development delay in sitting and walking.


Usher syndrome type 1 (USH1) is an autosomal recessive disease that is genetically heterogeneous. Variants in five genes: MYO7A, CDH23, PCDH15, USH1G, and USH1C account for ~75% of cases with detectable variants (Weil et al. Nature 374:60-61, 1995; Bork et al. Am J Hum Genet 68:26-37, 2001; Ahmed et al. Am J Hum Genet 69:25-34, 2001; Bitner-Glindzicz et al. Nat Genet 26:56-60, 2000; Keats and Lentz, GeneReviews, 2010). Variants in the USH1C gene account for ~7% of the cases. About 15 USH1C variants have been reported. Except for one missense variant, USH1C variants are predicted to result in truncating proteins and include nonsense, splicing, and small and large insertions or deletions.

Clinical Sensitivity - Sequencing with CNV PG-Select

This test allows the detection of variants in ~7% of patients with USH1 (Keats and Lentz, GeneReviews, 2010).

Testing Strategy

This test provides full coverage of all coding exons of the USH1C gene, plus ~10 bases of flanking noncoding DNA. We define full coverage as >20X NGS reads or Sanger sequencing.

Indications for Test

All patients with symptoms suggestive of combined sensorineural hearing loss, RP and vestibular areflexia and who have no variants in the genes that are frequently mutated in USH1 patients. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in USH1C.


Official Gene Symbol OMIM ID
USH1C 605242
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT


Name Inheritance OMIM ID
Deafness, Autosomal Recessive 18 AR 602092
Usher Syndrome, Type Ic AR 276904


  • Ahmed, Z. M., et.al. (2001). "Mutations of the protocadherin gene PCDH15 cause Usher syndrome type 1F." Am J Hum Genet 69(1): 25-34. PubMed ID: 11398101
  • Bitner-Glindzicz, M., et.al. (2000). "A recessive contiguous gene deletion causing infantile hyperinsulinism, enteropathy and deafness identifies the Usher type 1C gene." Nat Genet 26(1): 56-60. PubMed ID: 10973248
  • Bork, J. M., et.al. (2001). "Usher syndrome 1D and nonsyndromic autosomal recessive deafness DFNB12 are caused by allelic mutations of the novel cadherin-like gene CDH23." Am J Hum Genet 68(1): 26-37. PubMed ID: 11090341
  • Cohen M. et al. 2007. International Journal of Audiology. 46: 82-93. PubMed ID: 17365059
  • Daiger et al. 2007. PubMed ID: 17296890
  • Keats BJ, Lentz J. 2010. Usher Syndrome Type I. In: Pagon RA, Adam MP, Ardinger HH, Wallace SE, Amemiya A, Bean LJ, Bird TD, Dolan CR, Fong C-T, Smith RJ, and Stephens K, editors. GeneReviews(®), Seattle (WA): University of Washington, Seattle. PubMed ID: 20301442
  • Weil, D., et.al. (1995). "Defective myosin VIIA gene responsible for Usher syndrome type 1B." Nature 374(6517): 60-1. PubMed ID: 7870171


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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View Ordering Instructions

1) Select Test Method (Platform)

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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.
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