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Mowat-Wilson Syndrome via the ZEB2 Gene

  • Summary and Pricing
  • Clinical Features and Genetics
  • Citations
  • Methods
  • Ordering/Specimens
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TEST METHODS

Sequencing

Test Code Test Copy GenesIndividual Gene PriceCPT Code Copy CPT Codes
1567 ZEB2$990.00 81405 Add to Order
Targeted Testing

For ordering targeted known variants, please proceed to our Targeted Variants landing page.

Turnaround Time

The great majority of tests are completed within 18 days.

Clinical Sensitivity

MWS is associated with heterozygous deletions, translocations and intragenic mutations in ZEB2 (Mowat et al. 2003). Approximately 80% of patients with Mowat-Wison syndrome have a nonsense or frameshift mutation in ZEB2 (Saunders et al. 2009). Most of the remainder have large deletions which are not detectable by sequencing.

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Deletion/Duplication Testing via aCGH

Test Code Test Copy GenesIndividual Gene PriceCPT Code Copy CPT Codes
600 ZEB2$690.00 81404 Add to Order
Pricing Comment

# of Genes Ordered

Total Price

1

$690

2

$730

3

$770

4-10

$840

11-30

$1,290

31-100

$1,670

Over 100

Call for quote

Turnaround Time

The great majority of tests are completed within 28 days.

Clinical Features

Mowat-Wilson syndrome (MWS) is a complex developmental disorder with structural anomalies such as Hirschsprung disease, genitourinary anomalies (particularly hypospadias in males), congenital heart defects, agenesis or hypogenesis of the corpus callosum and eye defects such as microphthalmia and Axenfeld anomaly. Functional differences include moderate to severe intellectual disability, severe speech impairment with relative preservation of receptive language, seizures, growth retardation with microcephalya and chronic constipation in those without Hirschsprung disease (Adam et al. 2013).

Mowat-Wilson syndrome has many clinical features in common with Goldberg-Shprintzen megacolon syndrome, but the two disorders are genetically distinct (Mowat et al. 2003). Mowat-Wilson syndrome is caused by mutations in ZEB2, while Goldberg-Shprintzen megacolon syndrome is caused by mutations in the KIAA1279 gene.

Genetics

Mowat-Wilson syndrome is a rare autosomal dominant disorder with an estimated incidence of 1 per 50,000-70,000 live births (Ghoumid et al. 2013). About 45 cases have been reported so far (Mowat et al. 2003). Most patients with Mowat-Wilson syndrome have de novo heterozygous mutations in the ZEB2 gene (Ghoumid et al. 2013), however, rare affected sibs have been reported, suggesting germline somatic mosaicism in 1 of the parents (McGaughran et al. 2005; Cecconi et al. 2008).

ZEB2 belongs to the Zinc finger family of genes. ZEB2 protein is a transcription factor that plays a critical role in the formation of many organs and tissues before birth: neural crest, digestive tract, skeletal muscles, kidneys, and other organs. Approximately 80% of patients with Mowat-Wison syndrome have a nonsense or frameshift mutation in ZEB2, while most of the rest have gross deletions or translocations (Saunders et al. 2009). Rare missense or in-frame mutations in ZEB2 lead either to a milder form of MWS or to individuals with atypical features.

Testing Strategy

This test involves bidirectional Sanger DNA sequencing of all coding exons of ZEB2. The entire coding region and ~20 bp of flanking non-coding DNA on either side of each splice site are sequenced. We will also sequence any single exon (Test #100) or pair of exons (Test #200) in family members of patients with known mutations or to confirm research results.

Indications for Test

Consensus clinical diagnostic criteria for Mowat-Wilson syndrome (MWS) has not been established. The diagnosis should be considered in individuals with typical facial features (widely spaced eyes, broad medial eyebrows, low hanging columella, prominent or pointed chin, uplifted earlobes with a central depression) and Hirschsprung disease, genitourinary anomalies, congenital heart defects, agenesis or hypogenesis of the corpus callosum and eye defects.

Gene

Official Gene Symbol OMIM ID
ZEB2 605802
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Disease

Name Inheritance OMIM ID
Mowat-Wilson Syndrome 235730

CONTACTS

Genetic Counselors
Geneticist
Citations
  • Adam MP, Conta J, Bean LJ. 2013. Mowat-Wilson Syndrome. In: Pagon RA, Adam MP, Bird TD, Dolan CR, Fong C-T, Smith RJ, and Stephens K, editors. GeneReviews™, Seattle (WA): University of Washington, Seattle. PubMed ID: 20301585
  • Cecconi M, Forzano F, Garavelli L, Pantaleoni C, Grasso M, Dagna Bricarelli F, Perroni L, Maria E Di, Faravelli F. 2008. Recurrence of Mowat-Wilson syndrome in siblings with a novel mutation in the ZEB2 gene. Am. J. Med. Genet. A 146A: 3095–3099. PubMed ID: 19006215
  • Ghoumid J, Drevillon L, Alavi-Naini SM, Bondurand N, Rio M, Briand-Suleau A, Nasser M, Goodwin L, Raymond P, Yanicostas C, Goossens M, Lyonnet S, et al. 2013. ZEB2 zinc-finger missense mutations lead to hypomorphic alleles and a mild Mowat-Wilson syndrome. Hum. Mol. Genet. 22: 2652–2661. PubMed ID: 23466526
  • McGaughran J, Sinnott S, Moal FD-L, Wilson M, Mowat D, Sutton B, Goossens M. 2005. Recurrence of Mowat-Wilson syndrome in siblings with the same proven mutation. American Journal of Medical Genetics Part A 137A: 302–304. PubMed ID: 16088920
  • Mowat DR, Wilson MJ, Goossens M. 2003. Mowat-Wilson syndrome. Journal of medical genetics 40: 305–310. PubMed ID: 12746390
  • Saunders CJ, Zhao W, Ardinger HH. 2009. Comprehensive ZEB2 gene analysis for Mowat-Wilson syndrome in a North American cohort: a suggested approach to molecular diagnostics. Am. J. Med. Genet. A 149A: 2527–2531. PubMed ID: 19842203
Order Kits
TEST METHODS

Bi-Directional Sanger Sequencing

Test Procedure

Nomenclature for sequence variants was from the Human Genome Variation Society (http://www.hgvs.org).  As required, DNA is extracted from the patient specimen.  PCR is used to amplify the indicated exons plus additional flanking non-coding sequence.  After cleaning of the PCR products, cycle sequencing is carried out using the ABI Big Dye Terminator v.3.0 kit.  Products are resolved by electrophoresis on an ABI 3730xl capillary sequencer.  In most cases, sequencing is performed in both forward and reverse directions; in some cases, sequencing is performed twice in either the forward or reverse directions.  In nearly all cases, the full coding region of each exon as well as 20 bases of non-coding DNA flanking the exon are sequenced.

Analytical Validity

As of March 2016, we compared 17.37 Mb of Sanger DNA sequence generated at PreventionGenetics to NextGen sequence generated in other labs. We detected only 4 errors in our Sanger sequences, and these were all due to allele dropout during PCR. For Proficiency Testing, both external and internal, in the 12 years of our lab operation we have Sanger sequenced roughly 8,800 PCR amplicons. Only one error has been identified, and this was due to sequence analysis error.

Our Sanger sequencing is capable of detecting virtually all nucleotide substitutions within the PCR amplicons. Similarly, we detect essentially all heterozygous or homozygous deletions within the amplicons. Homozygous deletions which overlap one or more PCR primer annealing sites are detectable as PCR failure. Heterozygous deletions which overlap one or more PCR primer annealing sites are usually not detected (see Analytical Limitations). All heterozygous insertions within the amplicons up to about 100 nucleotides in length appear to be detectable. Larger heterozygous insertions may not be detected. All homozygous insertions within the amplicons up to about 300 nucleotides in length appear to be detectable. Larger homozygous insertions may masquerade as homozygous deletions (PCR failure).

Analytical Limitations

In exons where our sequencing did not reveal any variation between the two alleles, we cannot be certain that we were able to PCR amplify both of the patient’s alleles. Occasionally, a patient may carry an allele which does not amplify, due for example to a deletion or a large insertion. In these cases, the report contains no information about the second allele.

Similarly, our sequencing tests have almost no power to detect duplications, triplications, etc. of the gene sequences.

In most cases, only the indicated exons and roughly 20 bp of flanking non-coding sequence on each side are analyzed. Test reports contain little or no information about other portions of the gene, including many regulatory regions.

In nearly all cases, we are unable to determine the phase of sequence variants. In particular, when we find two likely causative mutations for recessive disorders, we cannot be certain that the mutations are on different alleles.

Our ability to detect minor sequence variants, due for example to somatic mosaicism is limited. Sequence variants that are present in less than 50% of the patient’s nucleated cells may not be detected.

Runs of mononucleotide repeats (eg (A)n or (T)n) with n >8 in the reference sequence are generally not analyzed because of strand slippage during PCR and cycle sequencing.

Unless otherwise indicated, the sequence data that we report are based on DNA isolated from a specific tissue (usually leukocytes). Test reports contain no information about gene sequences in other tissues.

Deletion/Duplication Testing Via Array Comparative Genomic Hybridization

Test Procedure

Equal amounts of genomic DNA from the patient and a gender matched reference sample are amplified and labeled with Cy3 and Cy5 dyes, respectively. To prevent any sample cross contamination, a unique sample tracking control is added into each patient sample. Each labeled patient product is then purified, quantified, and combined with the same amount of reference product. The combined sample is loaded onto the designed array and hybridized for at least 22-42 hours at 65°C. Arrays are then washed and scanned immediately with 2.5 µM resolution. Only data for the gene(s) of interest for each patient are extracted and analyzed.

Analytical Validity

PreventionGenetics' high density gene-centric custom designed aCGH enables the detection of relatively small deletions and duplications within a single exon of a given gene or deletions and duplications encompassing the entire gene. PreventionGenetics has established and verified this test's accuracy and precision.

Analytical Limitations

Our dense probe coverage may allow detection of deletions/duplications down to 100 bp; however due to limitations and probe spacing this cannot be guaranteed across all exons of all genes. Therefore, some copy number changes smaller than 100-300 bp within a targeted large exon may not be detected by our array.

This array may not detect deletions and duplications present at low levels of mosaicism or those present in genes that have pseudogene copies or repeats elsewhere in the genome.

aCGH will not detect balanced translocations, inversions, or point mutations that may be responsible for the clinical phenotype.

Breakpoints, if occurring outside the targeted gene, may be hard to define.

The sensitivity of this assay may be reduced when DNA is extracted by an outside laboratory.

Order Kits

Ordering Options


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.

SPECIMEN TYPES
WHOLE BLOOD

(Delivery accepted Monday - Saturday)

  • Collect 3 ml -5 ml (5 ml preferred) of whole blood in EDTA (purple top tube) or ACD (yellow top tube). For Test #500-DNA Banking only, collect 10 ml -20 ml of whole blood.
  • For small babies, we require a minimum of 1 ml of blood.
  • Only one blood tube is required for multiple tests.
  • Ship blood tubes at room temperature in an insulated container. Do not freeze blood.
  • During hot weather, include a frozen ice pack in the shipping container. Place a paper towel or other thin material between the ice pack and the blood tube.
  • In cold weather, include an unfrozen ice pack in the shipping container as insulation.
  • At room temperature, blood specimen is stable for up to 48 hours.
  • If refrigerated, blood specimen is stable for up to one week.
  • Label the tube with the patient name, date of birth and/or ID number.

DNA

(Delivery accepted Monday - Saturday)

  • Send in screw cap tube at least 5 µg -10 µg of purified DNA at a concentration of at least 20 µg/ml for NGS and Sanger tests and at least 5 µg of purified DNA at a concentration of at least 100 µg/ml for gene-centric aCGH, MLPA, and CMA tests, minimum 2 µg for limited specimens.
  • For requests requiring more than one test, send an additional 5 µg DNA per test ordered when possible.
  • DNA may be shipped at room temperature.
  • Label the tube with the composition of the solute, DNA concentration as well as the patient’s name, date of birth, and/or ID number.
  • We only accept genomic DNA for testing. We do NOT accept products of whole genome amplification reactions or other amplification reactions.

CELL CULTURE

(Delivery preferred Monday - Thursday)

  • PreventionGenetics should be notified in advance of arrival of a cell culture.
  • Culture and send at least two T25 flasks of confluent cells.
  • Some panels may require additional flasks (dependent on size of genes, amount of Sanger sequencing required, etc.). Multiple test requests may also require additional flasks. Please contact us for details.
  • Send specimens in insulated, shatterproof container overnight.
  • Cell cultures may be shipped at room temperature or refrigerated.
  • Label the flasks with the patient name, date of birth, and/or ID number.
  • We strongly recommend maintaining a local back-up culture. We do not culture cells.
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