Bardet-Biedl Syndrome via the BBS12 Gene
Summary and Pricing 
Test Method
Sequencing and CNV Detection via NextGen Sequencing using PG-Select Capture Probes| Test Code | Test Copy Genes | Test CPT Code | Gene CPT Codes Copy CPT Code | Base Price | |
|---|---|---|---|---|---|
| 7589 | BBS12 | 81479 | 81479,81479 | $990 | Order Options and Pricing |
Pricing Comments
Testing run on PG-select capture probes includes CNV analysis for the gene(s) on the panel but does not permit the optional add on of exome-wide CNV analysis. Any of the NGS platforms allow reflex to other clinically relevant genes, up to whole exome or whole genome sequencing depending upon the base platform selected for the initial test.
An additional 25% charge will be applied to STAT orders. STAT orders are prioritized throughout the testing process.
This test is also offered via a custom panel (click here) on our exome or genome backbone which permits the optional add on of exome-wide CNV or genome-wide SV analysis.
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
Bardet-Biedl syndrome (BBS) is an autosomal recessive disorder marked by primary features of obesity, polydactyly, pigmentary retinopathy, hypogonadism, renal anomalies, and mental retardation (Elbedour et al. Am J Med Genet 52(2):164-169, 1994; Sheffield. Trans Amer Clin Climatol Assoc 121:172-182, 2010). Secondary features include diabetes, hypertension, and congenital heart defects (Green et al. N Engl J Med 321(15):1002-1009, 1989). Although BBS is a rare condition, diagnosis is complicated by the fact that many of the clinical features (i.e. obesity, diabetes, hypertension, and developmental delay) are common. In addition, many of the BBS clinical features overlap with those of other well-described developmental disorders, including Meckel-Gruber syndrome (MKS; OMIM 249000), Joubert syndrome (JBTS; OMIM 213300), nephronophthisis (NPH; OMIM 256100), Senior-Loken syndrome (SLS; OMIM 609254), Leber congenital amaurosis (LCA; OMIM 204000), and Alstrom syndrome (OMIM 203800).
Genetics
BBS is primarily inherited as an autosomal recessive disorder, although complex inheritance has been reported in a few BBS families (Katsanis et al. Science 293:2256-2259, 2001). Variants in the BBS12 gene cause BBS (Stoetzel et al. Am J Hum Genet 80:1-11, 2007). BBS12 encodes a group II chaperonin protein (BBS12), which is localized to the basal body of the primary cilium (Marion et al. Proc Nat Acad Sci 106:1820-1825, 2009). BBS12 interacts with two other chaperonin-like BBS proteins, MKKS/BBS6 and BBS10, to form a chaperonin complex that mediates BBSome complex assembly (Seo et al. PNAS 107:1488-1493, 2010). A mix of missense, nonsense, and small deletion variants has been reported in BBS12 (Stoetzel et al. 2007). BBS exhibits locus heterogeneity; at least 12 BBS genes have been identified (BBS1, BBS2, BBS3, BBS4, BBS5, MKKS/BBS6, BBS7, TTC8/BBS8, BBS9, BBS10, TRIM32/BBS11, and BBS12) (Tobin and Beales, Genet Med 11:386-402, 2009). In addition, hypomorphic variants in two Meckel-Gruber syndrome genes (MKS1 and CEP290) were reported to be associated with BBS, representing BBS13 and BBS14 respectively (Leitch et al. Nat Genet 40:443-448, 2008).
Clinical Sensitivity - Sequencing with CNV PG-Select
Variants in the BBS12 gene are estimated to cause approximately 5% of BBS cases (Stoetzel et al. Am J Hum Genet 80:1-11, 2007).
Testing Strategy
This test provides full coverage of all coding exons of the BBS12 gene, plus ~10 bases of flanking noncoding DNA. We define full coverage as >20X NGS reads or Sanger sequencing.
Indications for Test
Candidates for this test are patients with symptoms consistent with BBS and the family members of patients who have known BBS12 variants. Conclusive connections between clinical features and individual mutated BBS genes have not yet been made. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in BBS12.
Candidates for this test are patients with symptoms consistent with BBS and the family members of patients who have known BBS12 variants. Conclusive connections between clinical features and individual mutated BBS genes have not yet been made. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in BBS12.
Gene
| Official Gene Symbol | OMIM ID |
|---|---|
| BBS12 | 610683 |
| Inheritance | Abbreviation |
|---|---|
| Autosomal Dominant | AD |
| Autosomal Recessive | AR |
| X-Linked | XL |
| Mitochondrial | MT |
Disease
| Name | Inheritance | OMIM ID |
|---|---|---|
| Bardet-Biedl Syndrome 12 | AR | 615989 |
Related Tests
Citations
- Elbedour K, Zucker N, Zalzstein E, Barki Y, Carmi R. 1994. Cardiac abnormalities in the Bardet-Biedl syndrome: echocardiographic studies of 22 patients. Am. J. Med. Genet. 52: 164–169. PubMed ID: 7802002
- Green JS, Parfrey PS, Harnett JD, Farid NR, Cramer BC, Johnson G, Heath O, McManamon PJ, O’Leary E, Pryse-Phillips W. 1989. The cardinal manifestations of Bardet–Biedl syndrome, a form of Laurence–Moon–Biedl syndrome. New England Journal of Medicine 321: 1002–1009. PubMed ID: 2779627
- Katsanis N, Ansley SJ, Badano JL, Eichers ER, Lewis RA, Hoskins BE, Scambler PJ, Davidson WS, Beales PL, Lupski JR. 2001. Triallelic inheritance in Bardet-Biedl syndrome, a Mendelian recessive disorder. Science 293: 2256–2259. PubMed ID: 11567139
- Leitch CC, Zaghloul NA, Davis EE, Stoetzel C, Diaz-Font A, Rix S, Al-Fadhel M, Lewis RA, Eyaid W, Banin E, Dollfus H, Beales PL, et al. 2008. Hypomorphic mutations in syndromic encephalocele genes are associated with Bardet-Biedl syndrome. Nature Genetics 40: 443–448. PubMed ID: 18327255
- Marion, V., et.al. (2009). "Transient ciliogenesis involving Bardet-Biedl syndrome proteins is a fundamental characteristic of adipogenic differentiation." Proc Natl Acad Sci U S A 106(6): 1820-5. PubMed ID: 19190184
- Seo, S. et.al. (2010). "BBS6, BBS10, and BBS12 form a complex with CCT/TRiC family chaperonins and mediate BBSome assembly." Proc Natl Acad Sci U S A 107(4): 1488-1493. PubMed ID: 20080638
- Sheffield, V.C. 2010. The blind leading the obese: the molecular pathophysiology of a human obesity syndrome. Trans Am Clin Climatol Assoc 121:172-182. PubMed ID: 20697559
- Stoetzel, C., et.al. (2007). "Identification of a novel BBS gene (BBS12) highlights the major role of a vertebrate-specific branch of chaperonin-related proteins in Bardet-Biedl syndrome." Am J Hum Genet 80(1): 1-11. PubMed ID: 17160889
- Tobin, J. L., Beales, P. L. (2009). "The nonmotile ciliopathies." Genet Med 11(6): 386-402. PubMed ID: 19421068
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
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