Treacher Collins Syndrome via the POLR1C Gene

Summary and Pricing

Test Method

Exome Sequencing with CNV Detection
Test Code Test Copy GenesTest CPT Code Gene CPT Codes Copy CPT Codes Base Price
11599 POLR1C 81479 81479,81479 $890 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
11599POLR1C81479 81479 $890 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.

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

For Reflex to PGxome pricing click here.

The Sanger Sequencing method for this test is NY State approved.

For Sanger Sequencing click here.

Turnaround Time

18 days on average for standard orders or 14 days on average for STAT orders.

Once a specimen has started the testing process in our lab, the most accurate prediction of TAT will be displayed in the myPrevent portal as an Estimated Report Date (ERD) range. We calculate the ERD for each specimen as testing progresses; therefore the ERD range may differ from our published average TAT. View 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

Clinical Features and Genetics

Clinical Features

Treacher Collins syndrome (TCS, also called mandibulofacial dysostosis or Franceschetti-Kelin syndrome) is a craniofacial malformation disorder characterized by downward slanting palpebral fissures, lower eyelid colobomas, microtia, and malar and mandibular hypoplasia. Other features include cleft palate, malformation of external ear canals, and bilateral conductive hearing loss (Dixon 1996; Chang et al. 2012). Clinical presentations of TCS are highly variable. TCS shares some facial dysmorphic features with other syndromes such as Pierre-Robin, Miller, Nager, and Goldenhar syndromes. It can be further divided into three subtypes: TCS type 1 is inherited in an autosomal dominant manner and is caused by mutations in TCOF1. TCS type 2 is inherited in both autosomal dominant and autosomal recessive manners and is caused by mutations in POLR1D. TCS type 3 is inherited in an autosomal recessive form and is caused by mutations in POLR1C (Dixon et al. 1996; Dauwerse et al. 2011; Katsanis and Jabs 2012, Schaefer et al. 2014).

Genetics

TCS3 is inherited in an autosomal recessive form and is caused by mutations in the POLR1C gene. Polymerase (RNA) I polypeptide C, 30kDa (also called DNA-directed RNA polymerases I and III 40 kDa polypeptide) and coded by POLR1C, is a subunit of RNA polymerase I and III. Both RNA polymerase I and III are involved in ribosomal RNA transcription. RNA polymerase III predominantly involves synthesis of 5S ribosomal RNA and transfer RNA. To date, five unique causative mutations have been identified in three unrelated index TCS patients. They are: 2 missense, one nonsense, and 2 small deletions (Dauwerse et al. 2011).

Clinical Sensitivity - Sequencing with CNV PGxome

POLR1C mutations were identified in 3 out of 242 (~1%) unrelated patients with TCS or TCS phenotypic spectrum, who were negative for TCOF1 mutations (Dauwerse et al. 2011).

Testing Strategy

This test provides full coverage of all coding exons of the POLR1C 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.

Since this test is performed using exome capture probes, a reflex to any of our exome based tests is available (PGxome, PGxome Custom Panels).

Indications for Test

Candidates for this test are patients with symptoms consistent with Treacher Collins Syndrome, and the family members of patients who have known POLR1C mutations. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in POLR1C.

Gene

Official Gene Symbol OMIM ID
POLR1C 610060
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Disease

Name Inheritance OMIM ID
Treacher Collins syndrome 3 AR 248390

Citations

  • Chang C, Steinbacher D. 2012. Treacher Collins Syndrome. Seminars in Plastic Surgery 26: 083–090. PubMed ID: 23633935
  • Dauwerse JG, Dixon J, Seland S, Ruivenkamp CAL, Haeringen A van, Hoefsloot LH, Peters DJM, Boers AC, Daumer-Haas C, Maiwald R, Zweier C, Kerr B, Cobo AM, Toral JF, Hoogeboom AJ, Lohmann DR, Hehr U, Dixon MJ, Breuning MH, Wieczorek D. 2010. Mutations in genes encoding subunits of RNA polymerases I and III cause Treacher Collins syndrome. Nature Genetics 43: 20–22. PubMed ID: 21131976
  • Dixon MJ. 1996. Treacher Collins syndrome. Human molecular genetics 5: 1391–1393. PubMed ID: 8875242
  • Katsanis SH, Jabs EW. 2012. Treacher Collins Syndrome. 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: 20301704
  • Schaefer E, Collet C, Genevieve D, Vincent M, Lohmann DR, Sanchez E, Bolender C, Eliot M-M, Nürnberg G, Passos-Bueno M-R, Wieczorek D, Maldergem L van, Doray B. 2014. Autosomal recessive POLR1D mutation with decrease of TCOF1 mRNA is responsible for Treacher Collins syndrome. Genetics in Medicine. PubMed ID: 24603435

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.

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 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.

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