Deafness-Dystonia-Optic Neuronopathy (Mohr-Tranebjaerg/Jensen) Syndrome via the TIMM8A 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 | |
|---|---|---|---|---|---|
| 9091 | TIMM8A | 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
Mohr-Tranebjaerg syndrome is an X-linked disorder characterized by males presenting with progressive prelingual or postlingual sensorineural hearing loss. Impaired hearing becomes evident between ages 2 to 5, with profound hearing loss typically presenting before age ten years. The deafness can be part of a progressive syndrome that includes visual disability leading to cortical blindness, dystonia, fractures, and mental deficiency and was later renamed as Deafness-Dystonia-Optic Neuronopathy (DDON) Syndrome (Tranebjaerg 2013). Opticoacoustic nerve atrophy (Jensen syndrome) [OMIM # 311150] and deafness-dystonia syndrome [OMIM # 304700] are the same as DDON syndrome.
Genetics
Mohr-Tranebjaerg syndrome is an X-linked recessive disorder of unknown prevalence with less than100 affected individuals identified worldwide. Some obligate carrier females show signs of minor neuropathy and mild hearing impairment. DDON or Mohr-Tranebjaerg syndrome occurs as either a single-gene disorder resulting from missense and nonsense mutations as well as small deletions in TIMM8A. It also occurs as a contiguous gene deletion syndrome at Xq22, which also includes X-linked agammaglobulinemia caused by disruption of BTK, located telomeric to TIMM8A.
Clinical Sensitivity - Sequencing with CNV PGxome
Since very limited studies have been done to evaluate this disorder, the clinical sensitivity of our assay is currently unknown.
Testing Strategy
This test provides full coverage of all coding exons of the TIMM8A 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
DDON syndrome is suspected in males with the following: progressive sensorineural hearing impairment with prelingual or postlingual onset, movement disorder (dystonia/ataxia), gradual onset and slow progression of personality changes, paranoia, dementia, gradual decrease in visual acuity associated with optic atrophy, gradual onset and slow progression of dysphagia and a family history consistent with X-linked recessive inheritance.
DDON syndrome is suspected in males with the following: progressive sensorineural hearing impairment with prelingual or postlingual onset, movement disorder (dystonia/ataxia), gradual onset and slow progression of personality changes, paranoia, dementia, gradual decrease in visual acuity associated with optic atrophy, gradual onset and slow progression of dysphagia and a family history consistent with X-linked recessive inheritance.
Gene
| Official Gene Symbol | OMIM ID |
|---|---|
| TIMM8A | 300356 |
| Inheritance | Abbreviation |
|---|---|
| Autosomal Dominant | AD |
| Autosomal Recessive | AR |
| X-Linked | XL |
| Mitochondrial | MT |
Diseases
| Name | Inheritance | OMIM ID |
|---|---|---|
| Jensen Syndrome | 311150 | |
| Mohr-Tranebjaerg Syndrome | XL | 304700 |
Citations
- Tranebjærg L. 2013. Deafness-Dystonia-Optic Neuronopathy Syndrome. In: Pagon RA, Adam MP, Bird TD, Dolan CR, Fong C-T, and Stephens K, editors. GeneReviews™, Seattle (WA): University of Washington, Seattle. PubMed ID: 20301395
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
View Ordering Instructions1) Select Test Type
2) Select Additional Test Options
No Additional Test Options are available for this test.