Bartter Syndrome Type 1 via the SLC12A1 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 | |
|---|---|---|---|---|---|
| 11669 | SLC12A1 | 81407 | 81407, 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. If the Sanger option is selected, CNV detection may be ordered through Test #600.
A 25% additional charge will be applied to STAT orders. View STAT turnaround times here.
For Reflex to PGxome pricing click here.
The Sanger Sequencing method for this test is NY State approved.
For Sanger Sequencing click here.Targeted Testing
For ordering sequencing of targeted known variants, go to our Targeted Variants page.
Turnaround Time
18 days on average
Clinical Features and Genetics
Clinical Features
Bartter syndrome is a group of genetically heterogeneous renal tubular disorders characterized by renal hypokalaemia, metabolic alkalosis and secondary hyperaldosteronism with normal to low blood pressure due to a renal loss of sodium (Simon et al. 1996; Scheinman et al. 1999; Brochard et al. 2009). Bartter syndrome type 1 is an antenatal condition caused by loss-of-function in the sodium-potassium-chloride cotransporter encoded by the SLC12A1 gene. Common clinical features include hypercalciuria with nephrocalcinosis, maternal polyhydramnios leading to premature birth, intrauterine and postnatal polyuria, recurrent vomiting, failure to thrive and growth retardation. Patients with SLC12A1 defects may have a clinical onset beyond the neonatal period.
Genetics
Bartter syndrome type 1 is an autosomal recessive disorder caused by defects in the SLC12A1 gene (Simon et al. 1996). SLC12A1 has 26 coding exons that encode a kidney-specific sodium-potassium-chloride cotransporter, which plays a key role in concentrating urine and accounts for most of the NaCl resorption. Genetic defects of SLC12A1 occur throughout the whole coding region and include missense, nonsense, splicing site mutations and small deletion/insertions (Human Gene Mutation Database). Exon-level large deletions involving SLC12A1 have not been reported.
Testing Strategy
This test provides full coverage of all coding exons of the SLC12A1 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).
Clinical Sensitivity - Sequencing with CNV PGxome
Detection rates of pathogenic variants in the SLC12A1 gene in a large cohort of patients with Bartter syndrome are unknown in the literature because documented SLC12A1 pathogenic variants have only been reported in limited cases.
Indications for Test
Candidates for this test are patients with Bartter syndrome type 1. Testing is also indicated for family members of patients who have known SLC12A1 mutations. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in SLC12A1.
Candidates for this test are patients with Bartter syndrome type 1. Testing is also indicated for family members of patients who have known SLC12A1 mutations. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in SLC12A1.
Gene
| Official Gene Symbol | OMIM ID |
|---|---|
| SLC12A1 | 600839 |
| Inheritance | Abbreviation |
|---|---|
| Autosomal Dominant | AD |
| Autosomal Recessive | AR |
| X-Linked | XL |
| Mitochondrial | MT |
Disease
| Name | Inheritance | OMIM ID |
|---|---|---|
| Bartter Syndrome Antenatal Type 1 | AR | 601678 |
Citations
- Brochard K, Boyer O, Blanchard A, Loirat C, Niaudet P, Macher M-A, Deschenes G, Bensman A, Decramer S, Cochat P, Morin D, Broux F, et al. 2009. Phenotype-genotype correlation in antenatal and neonatal variants of Bartter syndrome. Nephrol. Dial. Transplant. 24: 1455–1464. PubMed ID: 19096086
- Human Gene Mutation Database (Bio-base).
- Scheinman SJ, Guay-Woodford LM, Thakker RV, Warnock DG. 1999. Genetic disorders of renal electrolyte transport. N. Engl. J. Med. 340: 1177–1187. PubMed ID: 10202170
- Simon DB, Karet FE, Hamdan JM, DiPietro A, Sanjad SA, Lifton RP. 1996. Bartter’s syndrome, hypokalaemic alkalosis with hypercalciuria, is caused by mutations in the Na-K-2Cl cotransporter NKCC2. Nat. Genet. 13: 183–188. PubMed ID: 8640224
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 Instructions1) 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.