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Usher Syndrome Type 1, Deafness, Autosomal Dominant 11 (DFNA11) and Deafness, Autosomal Recessive 2 (DFNB2) via the MYO7A 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
3091 MYO7A 81407 81407,81479 $640 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
3091MYO7A81407 81407,81479 $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

  • 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 OMIM 276900) 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.

Genetics

Usher syndrome type 1 (USH1) is an autosomal recessive disease that is genetically heterogeneous. Variants in the 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, 2010). Variants in the MYO7A gene account for up to 50% of cases. Over 200 MYO7A variants have been reported. The majority of variants are missense, although chain termination variants are also common. Large deletion/insertions or complex rearrangements are apparently rare. In addition to USH1, MYO7A variants have been reported in patients with autosomal recessive (DFNB2) or autosomal dominant (DFNA11) nonsyndromic hearing loss (Liu et al. Nat Genet 16:188-190, 1997; Luijendijk et al. Hum Genet 115:149-156, 2004). The MYO7A gene encodes myosin VIIa, a myosin motor protein.

Clinical Sensitivity - Sequencing with CNV PG-Select

This test allows the detection of variants in approximately 50% of patients with USH1 (Keats and Lentz, GeneReviews, 2010).

Testing Strategy

This test provides full coverage of all coding exons of the MYO7A 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 are candidates for testing. The MYO7A gene is also a candidate for patients presenting with familial nonsyndromic hearing loss (DFNB2 and DFNA11). This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in MYO7A.

Gene

Official Gene Symbol OMIM ID
MYO7A 276903
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Disease

Name Inheritance OMIM ID
Usher Syndrome, Type 1 AR 276900

Citations

  • 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
  • Liu, X. Z., et.al. (1997). "Mutations in the myosin VIIA gene cause non-syndromic recessive deafness." Nat Genet 16(2): 188-90. PubMed ID: 9171832
  • Luijendijk, M. W., et.al. (2004). "Identification and molecular modelling of a mutation in the motor head domain of myosin VIIA in a family with autosomal dominant hearing impairment (DFNA11)." Hum Genet 115(2): 149-56. PubMed ID: 15221449
  • Weil, D., et.al. (1995). "Defective myosin VIIA gene responsible for Usher syndrome type 1B." Nature 374(6517): 60-1. PubMed ID: 7870171

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.
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