3-M Syndrome via the CUL7 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 | |
|---|---|---|---|---|---|
| 11221 | CUL7 | 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
3-M syndrome (OMIM 273750) is an intrauterine growth retardation disorder characterized by pre- and postnatal growth retardation, a large head circumference, and a characteristic facial appearance including a prominent forehead, pointed triangular shaped face, a short upturned nose with anteverted nares, prominent mouth and lips, and full eyebrows (van der Wal et al. Clin Dysmorphol 10:241-252, 2001; Marik et al. J Paediatr Child Health 38:419-422, 2002; Huber et al. Nat Genet 37:1119-1124, 2005). Additional findings include a short broad neck, prominent trapezii, deformed sternum, short thorax, square shoulders, winged scapulae, hyperlordosis, short fifth fingers, slender long bones with diaphyseal constriction, tall vertebral bodies, delayed bone age, and prominent heels (van der Wal et al. 2001; Huber et al. 2005; Huber et al. Eur J Hum Genet 17:395-400, 2009).
Genetics
3-M syndrome is an autosomal recessive disorder caused by variants in the CUL7 gene (Huber et al. 2005). The CUL7 gene encodes cullin-7 protein, which plays a scaffold role in assembling an E3 ubiquitin ligase complex. This complex contains both the heterodimer of Skp1 and Fbx29 (also known as Fbw8) and the ROC1 RING-finger protein (Huber et al. 2005). A mix of missense, nonsense, frameshift, splicing, deletions and duplications variants have been reported in CUL7 (Huber et al. 2005; Huber et al. 2009).
Clinical Sensitivity - Sequencing with CNV PGxome
The prevalence of the CUL7 variants is currently unknown. However, CUL7 variants account for ~84% of the 3-M syndrome reported cases (Huber et al. 2009).
Testing Strategy
This test provides full coverage of all coding exons of the CUL7 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
Candidates for this test are patients with symptoms consistent with 3-M syndrome and family members of patients who have known CUL7 variants. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in CUL7.
Candidates for this test are patients with symptoms consistent with 3-M syndrome and family members of patients who have known CUL7 variants. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in CUL7.
Gene
| Official Gene Symbol | OMIM ID |
|---|---|
| CUL7 | 609577 |
| Inheritance | Abbreviation |
|---|---|
| Autosomal Dominant | AD |
| Autosomal Recessive | AR |
| X-Linked | XL |
| Mitochondrial | MT |
Disease
| Name | Inheritance | OMIM ID |
|---|---|---|
| Three M Syndrome 1 | AR | 273750 |
Citations
- Huber, C., et.al. (2005). "Identification of mutations in CUL7 in 3-M syndrome." Nat Genet 37(10): 1119-24. PubMed ID: 16142236
- Huber, C., et.al. (2009). "A large-scale mutation search reveals genetic heterogeneity in 3M syndrome." Eur J Hum Genet 17(3): 395-400. PubMed ID: 19225462
- Marik, I., et.al. (2002). "3-M syndrome in two sisters." J Paediatr Child Health 38(4): 419-22. PubMed ID: 12174011
- van der Wal, G., et.al. (2001). "3-M syndrome: description of six new patients with review of the literature." Clin Dysmorphol 10(4): 241-52. PubMed ID: 11665997
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.