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Test Code DSG13 Desmoglein 1 (DSG1) and Desmoglein 3 (DSG3), IgG Antibodies, Serum

Performing Laboratory

Mayo Medical Laboratories in Rochester

Reporting Name

Desmoglein 1 and 3, S

Specimen Type

Serum


Specimen Required


Container/Tube: 

Preferred: Red top

Acceptable: Serum gel

Specimen Volume: 1 mL


Reject Due To

Hemolysis

Mild OK; Gross reject

Lipemia

Mild reject; Gross reject

Icterus

Mild OK; Gross reject

Other

NA

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  36 hours

Specimen Minimum Volume

0.5 mL

Day(s) and Time(s) Performed

Once per week, Monday through Friday, day of testing determined by laboratory

Specimen Retention Time

14 days

Analytic Time

Same day/1 day (Samples are tested one day/week)

Reference Values

DESMOGLEIN 1

<14.0 U (negative)

14.0-20.0 U (indeterminate)

>20.0 U (positive)

 

DESMOGLEIN 3

<9.0 U (negative)

9.0-20.0 U (indeterminate)

>20.0 U (positive)

Useful For

Preferred screening test for patients suspected to have an autoimmune blistering disorder of the skin or mucous membranes (pemphigus)

 

As an aid in the diagnosis of pemphigus

Method Name

Enzyme-Linked Immunosorbent Assay (ELISA)

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

83516 x 2

LOINC Code Information

Test ID Test Order Name Order LOINC Value
DSG13 Desmoglein 1 and 3, S 43309-4

 

Result ID Test Result Name Result LOINC Value
83680 DSG 1 43311-0
24027 DSG 3 43312-8

Clinical Information

Pemphigus includes a group of often fatal autoimmune, blistering diseases characterized by intraepithelial lesions. Pemphigus vulgaris and its variants may present with oral or mucosal lesions alone or with mucosal plus skin lesions. Pemphigus foliaceous and variants present with skin lesions alone.

 

Indirect immunofluorescence (IIF) studies reveal that both forms of pemphigus are caused by autoantibodies to cell surface antigens of stratified epithelia or mucous membranes and skin. These antibodies bind to calcium-dependent adhesion molecules in cell surface desmosomes, notably desmoglein 1 (DSG1) in pemphigus foliaceus and desmoglein 3 (DSG3) and/or DSG1 in pemphigus vulgaris. Desmogleins are protein substances located in and on the surface of keratinocytes. These proteins have been shown to be a critical factor in cell-to-cell adhesion. Antibodies to desmogleins can result in loss of cell adhesion, the primary cause of blister formation in pemphigus.

 

The diagnosis of pemphigus depends on biopsy and serum studies that characterize lesions and detect the autoantibodies that cause them. Originally, the serum studies were performed by IIF using monkey esophagus and other tissue substrates. The identification of the reactive antigens as DSG1 and DSG3 has made it possible to develop highly specific and sensitive enzyme-linked immunosorbent assay methods.

Interpretation

Antibodies to desmoglein 1 (DSG1) and desmoglein 3 (DSG3) have been shown to be present in patients with pemphigus. Many patients with pemphigus foliaceus, a superficial form of pemphigus have antibodies to DSG1. Patients with pemphigus vulgaris, a deeper form of pemphigus, have antibodies to DSG3 and sometimes DSG1 as well.

 

Antibody titer correlates in a semiquantitative manner with disease activity in many patients. Patients with severe disease can usually be expected to have high titers of antibodies to DSG. Titers are expected to decrease with clinical improvement.

 

Our experience demonstrates a very good correlation between DSG1 and DSG3 results and the presence of pemphigus. Adequate sensitivities and specificity for disease are documented. However, in those patients strongly suspected to have pemphigus either by clinical findings or by routine biopsy, and in whom the DSG assay is negative, the IIF test (CIFS / Cutaneous Immunofluorescence Antibodies [IgG], Serum) is recommended.

Cautions

Recommend repeat testing of indeterminate specimens, either with a fresh specimen drawn at a later time or the original specimen tested by another method.

 

The desmoglein 1 (DSG1) and desmoglein 3 (DSG3) results serve only as an aid to diagnosis and should not be interpreted as diagnostic by themselves. The results should be interpreted in conjunction with clinical evaluation of the patient along with other diagnostic procedures.

 

Performance of these assays in the pediatric population has not been established.

 

The assay performance characteristics have not been established for matrices other than serum.

 

A positive result indicates the presence of antibodies to recombinant DSG1 and DSG3 and does not specifically identify a certain type of pemphigus.

 

A negative result does not rule out the presence of pemphigus.

Clinical Reference

1. Amagai M, Tsunoda K, Zillikens D, et al: The clinical phenotype of pemphigus is defined by the anti-desmoglein autoantibody profile. J Am Dermatol 1999 Feb;40(2 Pt 1):167-170

2. Amagai M, Komai A, Hashimoto T, et al: Usefulness of enzyme linked immunoabsorbent assay using recombinant desmogleins 1 and 3 for sero-diagnosis of pemphigus. Brit J Dermatol 1999 Feb;140(2):351-357

3. Harman KE, Gratin MJ, Bhogal SJ, et al: The clinical significance of autoantibodies to desmoglein 1 in 78 cases of pemphigus vulgaris. J Invest Derm 1999;115:568

Method Description

This enzyme-linked immunosorbent assay (ELISA) method detects and measures serum levels of antibodies of certain pemphigus diseases. Calibrators and patient sera are added to microwells coated with DSG1 and DSG3 antigens, allowing antibodies to react with the immobilized antigens. After washing to remove any unbound serum proteins, horseradish peroxidase conjugated IgG is added and incubated. Following another wash step, the peroxidase substrate is added and allowed to incubate for an additional period. Stop solution is then added to each well to cancel the enzyme reaction and to stabilize the color development. The assay can be quantified by measuring the reaction photometrically and plotting the results.(Ishii K, Amagai M, Hall RP, et al: Characterization of autoantibodies in pemphigus using antigen specific ELISA's with baculovirus expresses recombinant desmogleins. J Immunol 1997 Aug 15;159[4]:2010-2017)