Neonatal screening for severe combined immunodeficiency caused by an adenosine deaminase defect: A reliable and inexpensive method using tandem mass spectrometry

Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present....

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Published inJournal of allergy and clinical immunology Vol. 127; no. 6; pp. 1394 - 1399
Main Authors Azzari, Chiara, la Marca, Giancarlo, Resti, Massimo
Format Journal Article
LanguageEnglish
Published New York, NY Mosby, Inc 01.06.2011
Elsevier
Elsevier Limited
Subjects
DBS
ADA
Online AccessGet full text
ISSN0091-6749
1097-6825
1085-8725
1097-6825
DOI10.1016/j.jaci.2011.03.040

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Abstract Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results. The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators. DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2′-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517). The mean levels of adenosine and 2′-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2′-deoxyadenosine was never detected in healthy control subjects (adenosine: P < 10 −6 [95% confidence limit, 7.59-7.78] and 2′-deoxyadenosine: P < 10 −6 [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was €0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy. Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
AbstractList Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results. The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators. DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2′-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517). The mean levels of adenosine and 2′-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2′-deoxyadenosine was never detected in healthy control subjects (adenosine: P < 10 −6 [95% confidence limit, 7.59-7.78] and 2′-deoxyadenosine: P < 10 −6 [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was €0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy. Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
Adenosine deaminase (ADA)-severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results. Objective: The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators. Methods: DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2'-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517). Results: The mean levels of adenosine and 2'-deoxyadenosine were 7.8 +/- 3.1 and 8.5 +/- 6.0 [micro]mol/L, respectively, in affected children; adenosine was found at 0.23 +/- 0.09 [micro]mol/L, whereas 2'-deoxyadenosine was never detected in healthy control subjects (adenosine: P 10[super]-6 [95% confidence limit, 7.59-7.78] and 2'-deoxyadenosine: P 10[super]-6 [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was [Euros]0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy. Conclusion: Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
Adenosine deaminase (ADA)-severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results.BACKGROUNDAdenosine deaminase (ADA)-severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results.The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators.OBJECTIVEThe aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators.DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2'-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517).METHODSDBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2'-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517).The mean levels of adenosine and 2'-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2'-deoxyadenosine was never detected in healthy control subjects (adenosine: P < 10(-6) [95% confidence limit, 7.59-7.78] and 2'-deoxyadenosine: P < 10(-6) [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was €0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy.RESULTSThe mean levels of adenosine and 2'-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2'-deoxyadenosine was never detected in healthy control subjects (adenosine: P < 10(-6) [95% confidence limit, 7.59-7.78] and 2'-deoxyadenosine: P < 10(-6) [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was €0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy.Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.CONCLUSIONTandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
Adenosine deaminase (ADA)-severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results. The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators. DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2'-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517). The mean levels of adenosine and 2'-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2'-deoxyadenosine was never detected in healthy control subjects (adenosine: P < 10(-6) [95% confidence limit, 7.59-7.78] and 2'-deoxyadenosine: P < 10(-6) [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was €0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy. Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
Background Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results. Objective The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators. Methods DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2′-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517). Results The mean levels of adenosine and 2′-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2′-deoxyadenosine was never detected in healthy control subjects (adenosine: P  < 10−6 [95% confidence limit, 7.59-7.78] and 2′-deoxyadenosine: P  < 10−6 [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was €0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy. Conclusion Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
Background Adenosine deaminase (ADA)-severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results. Objective The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators. Methods DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2'-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517). Results The mean levels of adenosine and 2'-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2'-deoxyadenosine was never detected in healthy control subjects (adenosine:P < 10-6[95% confidence limit, 7.59-7.78] and 2'-deoxyadenosine:P < 10-6[95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was &z.euro;0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy. Conclusion Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
BACKGROUND: Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in infancy because of severe recurrent infections. When diagnosis is made, permanent damage caused by infections or by metabolites is often present. Gene therapy, bone marrow transplantation, or enzyme therapy might be effective if performed early. ADA-SCID complies with all the criteria for inclusion in a newborn screening program. However, screening methods are still expensive or provide a non-negligible number of indeterminate results. OBJECTIVE: The aim of the present study was to develop a simple, reliable, and inexpensive method for diagnosis of ADA-SCID by using dried blood spot (DBS) samples taken at birth. Cost per test was calculated, including the cost for reagents, equipment, and operators. METHODS: DBS samples from 4 patients with genetically confirmed ADA-SCID and 12,020 DBS samples from healthy newborns were examined. Adenosine and 2′-deoxyadenosine were tested by using tandem mass spectrometry (PCT EP2010/070517). RESULTS: The mean levels of adenosine and 2′-deoxyadenosine were 7.8 ± 3.1 and 8.5 ± 6.0 μmol/L, respectively, in affected children; adenosine was found at 0.23 ± 0.09 μmol/L, whereas 2′-deoxyadenosine was never detected in healthy control subjects (adenosine: P < 10⁻⁶ [95% confidence limit, 7.59-7.78] and 2′-deoxyadenosine: P < 10⁻⁶ [95% confidence limit, 8.65-8.82] for control subjects vs patients with ADA-SCID). No indeterminate or false-positive results were found. Cost per test was €0.01 ($0.013). A pilot population-based newborn screening for ADA-SCID has started in Tuscany, Italy. CONCLUSION: Tandem mass spectrometry can be used for diagnosis of one of the most frequent form of SCID at a negligible cost.
Author la Marca, Giancarlo
Resti, Massimo
Azzari, Chiara
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  organization: Department of Pediatrics, University of Florence, Florence, Italy
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ContentType Journal Article
Copyright 2011 American Academy of Allergy, Asthma & Immunology
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Copyright © 2011 American Academy of Allergy, Asthma & Immunology. Published by Mosby, Inc. All rights reserved.
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Copyright_xml – notice: 2011 American Academy of Allergy, Asthma & Immunology
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– notice: Copyright © 2011 American Academy of Allergy, Asthma & Immunology. Published by Mosby, Inc. All rights reserved.
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IsDoiOpenAccess true
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Issue 6
Keywords tandem mass spectrometry
DBS
Adenosine deaminase
TREC
severe combined immunodeficiency
newborn screening
SCID
ADA
Dried blood spot
T-cell receptor gene excision circle
Human
Immunopathology
Neonatal
Severe combined immunodeficiency
Enzyme
Exploration
Method
Medical screening
Immunology
Newborn
Hydrolases
Combined immune deficiency
Mass spectrometry
Language English
License CC BY 4.0
Copyright © 2011 American Academy of Allergy, Asthma & Immunology. Published by Mosby, Inc. All rights reserved.
other-oa
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SSID ssj0009389
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Snippet Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in...
Background Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually...
Adenosine deaminase (ADA)-severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually fatal in...
Background Adenosine deaminase (ADA)-severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually...
BACKGROUND: Adenosine deaminase (ADA)–severe combined immunodeficiency (SCID) is an SCID caused by a defect in the enzyme adenosine deaminase. It is usually...
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StartPage 1394
SubjectTerms adenosine
Adenosine - blood
Adenosine deaminase
Adenosine Deaminase - blood
Adenosine Deaminase - deficiency
Agammaglobulinemia - blood
Agammaglobulinemia - diagnosis
Allergy and Immunology
Amino acids
Biological and medical sciences
blood
Blood Chemical Analysis - economics
Blood Chemical Analysis - methods
Blood Chemical Analysis - statistics & numerical data
bone marrow transplant
Case-Control Studies
Child
Child, Preschool
children
Costs and Cost Analysis
Defects
Deoxyadenosines - blood
Enzymes
Female
Fundamental and applied biological sciences. Psychology
Fundamental immunology
gene therapy
Humans
Immune system
Immunopathology
immunosuppression
infancy
Infant
Infant, Newborn
Infections
Italy
Laboratories
Male
Mass spectrometry
Medical sciences
Medical screening
Metabolism
Metabolites
Methods
Neonatal Screening - economics
Neonatal Screening - methods
neonates
Newborn babies
newborn screening
patients
Pilot Projects
Reproducibility of Results
Sarcoidosis. Granulomatous diseases of unproved etiology. Connective tissue diseases. Elastic tissue diseases. Vasculitis
screening
Sensitivity and Specificity
severe combined immunodeficiency
Severe Combined Immunodeficiency - blood
Severe Combined Immunodeficiency - diagnosis
tandem mass spectrometry
Tandem Mass Spectrometry - economics
Tandem Mass Spectrometry - methods
Tandem Mass Spectrometry - statistics & numerical data
Urine
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Title Neonatal screening for severe combined immunodeficiency caused by an adenosine deaminase defect: A reliable and inexpensive method using tandem mass spectrometry
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