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Monogenic Obesity via the MC4R Gene

Summary and Pricing

Test Method

Sequencing and CNV Detection via NextGen Sequencing using PG-Select Capture Probes
Test Code Test Copy GenesTest CPT Code Gene CPT Codes Copy CPT Codes Base Price
15181 MC4R 81403 81403,81479 $640 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
15181MC4R81403 81403(x1), 81479(x1) $640 Order Options and Pricing

Pricing Comments

This test is also offered via our exome backbone with CNV detection (click here). The exome-based test may be higher priced, but permits reflex to the entire exome or to any other set of clinically relevant genes.

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

Turnaround Time

18 days on average for standard orders or 13 days 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.

EMAIL CONTACTS

Genetic Counselors

Geneticist

  • Eric Bend, PhD

Clinical Features and Genetics

Clinical Features

Monogenic obesity is a group of single gene disorders with obesity as an isolated or predominant feature. Severe early-onset obesity caused by heterozygous mutations in the melanocortin-4 receptor gene (MC4R) is typically dominantly inherited (Vaisse et al. 1998; Yeo et al. 1998). Although less common, recessive inheritance of MC4R-associated obesity can occur (Farooqi et al. 2000). Common features include hyperphagia, increased linear growth, preserved reproductive function and hyperinsulinemia.

Genetics

MC4R-associated monogenic obesity can present with either dominant or recessive patterns of inheritance depending on the specific functional effects of particular mutations on the mutant receptor (Farooqi et al. 2000). The MC4R gene encodes a member of the melanocortin receptor family. So far, documented genetic defects of MC4R include missense, nonsense mutations and small deletion/insertions (Human Gene Mutation Database). A large deletion involving the MC4R gene has been reported (Human Gene Mutation Database).

Clinical Sensitivity - Sequencing with CNV PG-Select

The frequency of potentially pathogenic MC4R mutations in a cohort of severe early-onset obesity in children before the age of 10 years is 3.3% (Farooqi et al. 2000). In another large cohort study of severely obese adults, the global prevalence of obesity-specific MC4R pathogenic variants was 2.6% (Lubrano-Berthelier et al. 2006).

Testing Strategy

This test is performed using Next-Generation sequencing with additional Sanger sequencing as necessary.

This test provides full coverage of all coding exons of the MC4R 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 monogenic obesity. Testing is also indicated for family members of patients who have known mutations in the MC4R gene. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in MC4R.

Gene

Official Gene Symbol OMIM ID
MC4R 155541
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Disease

Name Inheritance OMIM ID
Obesity 618406

Citations

  • Farooqi IS, Yeo GS, Keogh JM, Aminian S, Jebb SA, Butler G, Cheetham T, O’Rahilly S. 2000. Dominant and recessive inheritance of morbid obesity associated with melanocortin 4 receptor deficiency. J. Clin. Invest. 106: 271–279. PubMed ID: 10903343
  • Human Gene Mutation Database (Bio-base).
  • Lubrano-Berthelier C, Dubern B, Lacorte J-M, Picard F, Shapiro A, Zhang S, Bertrais S, Hercberg S, Basdevant A, Clement K, Vaisse C. 2006. Melanocortin 4 receptor mutations in a large cohort of severely obese adults: prevalence, functional classification, genotype-phenotype relationship, and lack of association with binge eating. J. Clin. Endocrinol. Metab. 91: 1811–1818. PubMed ID: 16507637
  • Vaisse C, Clement K, Guy-Grand B, Froguel P. 1998. A frameshift mutation in human MC4R is associated with a dominant form of obesity. Nat. Genet. 20: 113–114. PubMed ID: 9771699
  • Yeo GS, Farooqi IS, Aminian S, Halsall DJ, Stanhope RG, O’Rahilly S. 1998. A frameshift mutation in MC4R associated with dominantly inherited human obesity. Nat. Genet. 20: 111–112. PubMed ID: 9771698

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


Specimen Types

Specimen Requirements and Shipping Details

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ORDER OPTIONS

View Ordering Instructions

1) Select Test Method (Backbone)


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.

Note: acceptable specimen types are whole blood and DNA from whole blood only.
Total Price: $
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