Genetic Regulation of Surfactant Deficiency

NCT ID: NCT00828243

Last Updated: 2021-06-07

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 525 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2007-11-30
• Study Completion Date: 2013-03-31

Brief Summary

Inherited deficiencies in any one of 3 genes (surfactant protein B, surfactant protein C, and ATP-binding cassette transporter A3) can cause neonatal respiratory distress syndrome by disrupting metabolism of the pulmonary surfactant. The investigators will use state of the art methods to link specific changes in the genetic code of each of these genes with disruption of discrete steps in the metabolism of the pulmonary surfactant in human newborn infants. These studies will lead to improved diagnostic capabilities and suggest novel strategies to correct surfactant deficiency in newborn infants.

Detailed Description

Genetic regulation of neonatal pulmonary surfactant deficiency has been suggested by studies of gender, genetic linkage, recurrent familial cases, targeted gene ablation in murine lineages, and by racial disparity in risk of neonatal respiratory distress syndrome. Successful fetal-neonatal pulmonary transition requires production of the pulmonary surfactant, a phospholipid-protein film that lines alveoli and maintains alveolar patency at end expiration. Our goal is to understand the genetic mechanisms that disrupt pulmonary surfactant metabolism and cause neonatal respiratory distress syndrome. Studies in human newborn infants have demonstrated that 3 genes are critical for surfactant metabolism: surfactant protein B (SFTPB), surfactant protein C (SFTPC), and an ATP-binding cassette transporter, ABCA3 (ABCA3). To understand genetic regulatory mechanisms, we will investigate the contribution of variation in each of these genes to risk of neonatal respiratory distress syndrome by testing the hypothesis that genetic variants in the SFTPB, SFTPC, and ABCA3 disrupt pulmonary surfactant metabolism. Using high throughput automated sequencing to genotype, multidimensional protein identification technology to assess quantitative and qualitative differences in surfactant protein B and C expression, in vivo metabolic labeling with stable isotopically labeled precursors to estimate surfactant protein B and C and phospholipid metabolic rates, and cohort sizes that provide statistical power (0.8), we will use race-specific, severity-stratified case-control (N=480) and case comparison (N=250) designs to understand genetically regulated, metabolic mechanisms that cause surfactant deficiency by disrupting expression or altering processing of surfactant proteins B or C or by disrupting surfactant phospholipid composition in human newborn infants. Improved understanding of genetic regulation of surfactant deficiency will suggest novel diagnostic strategies to identify and categorize high risk infants and therapeutic strategies that target discrete steps in pulmonary surfactant metabolism to improve outcomes of infants with neonatal respiratory distress syndrome.

Conditions

Respiratory Distress Syndrome, Newborn

Study Design

• Observational Model Type: CASE_CONTROL
• Study Time Perspective: PROSPECTIVE

Study Groups

Genetic association

Infants with and without neonatal respiratory distress syndrome undergo surfactant gene sequencing to identify genomic variants associated with neonatal respiratory distress syndrome

No interventions assigned to this group

Nutrient

To newborn infants with respiratory distress syndrome, we administer stable isotopically labeled nutrients (precursors of surfactant phospholipids or proteins) to permit mass spectrometry-based comparison of surfactant phospholipid and protein turnover.

Nutrient

Intervention Type: DRUG

We administer stable isotopically labeled precursors of surfactant phospholipids (\[1-13C1\] acetate) and of surfactant protein-B (\[5,5,5-2H3\] leucine) to infants with neonatal respiratory distress syndrome. Using mass spectrometry, we measure incorporation of stable isotopically labeled precursors in tracheal aspirates and compare surfactant phospholipid and surfactant protein-B turnover.

Interventions

Nutrient

We administer stable isotopically labeled precursors of surfactant phospholipids (\[1-13C1\] acetate) and of surfactant protein-B (\[5,5,5-2H3\] leucine) to infants with neonatal respiratory distress syndrome. Using mass spectrometry, we measure incorporation of stable isotopically labeled precursors in tracheal aspirates and compare surfactant phospholipid and surfactant protein-B turnover.

Intervention Type: DRUG

Other Intervention Names

[1-13C1] acetate, [5,5,5-2H3] leucine

Eligibility Criteria

Inclusion Criteria

• Newborn infants with respiratory distress syndrome who require mechanical ventilation via endotracheal tube or tracheostomy in the first 6 months of life

Exclusion Criteria

• Infants with conditions likely to cause imminent death

• Minimum Eligible Age: 1 Day
• Maximum Eligible Age: 6 Months
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

National Heart, Lung, and Blood Institute (NHLBI)

NIH

Sponsor Role: collaborator

Washington University School of Medicine

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

F. S. Cole, M.D.

Role: PRINCIPAL_INVESTIGATOR

Washington University School of Medicine

Locations

St. Louis Children's Hospital

St Louis, Missouri, United States

Countries

United States

References

Tomazela DM, Patterson BW, Hanson E, Spence KL, Kanion TB, Salinger DH, Vicini P, Barret H, Heins HB, Cole FS, Hamvas A, MacCoss MJ. Measurement of human surfactant protein-B turnover in vivo from tracheal aspirates using targeted proteomics. Anal Chem. 2010 Mar 15;82(6):2561-7. doi: 10.1021/ac1001433.

Reference Type: BACKGROUND

PMID: 20178338 (View on PubMed)

Hamvas A, Heins HB, Guttentag SH, Wegner DJ, Trusgnich MA, Bennet KW, Yang P, Carlson CS, An P, Cole FS. Developmental and genetic regulation of human surfactant protein B in vivo. Neonatology. 2009;95(2):117-24. doi: 10.1159/000153095. Epub 2008 Sep 6.

Reference Type: BACKGROUND

PMID: 18776725 (View on PubMed)

Hamvas A, Nogee LM, Wegner DJ, Depass K, Christodoulou J, Bennetts B, McQuade LR, Gray PH, Deterding RR, Carroll TR, Kammesheidt A, Kasch LM, Kulkarni S, Cole FS. Inherited surfactant deficiency caused by uniparental disomy of rare mutations in the surfactant protein-B and ATP binding cassette, subfamily a, member 3 genes. J Pediatr. 2009 Dec;155(6):854-859.e1. doi: 10.1016/j.jpeds.2009.06.006. Epub 2009 Aug 3.

Reference Type: RESULT

PMID: 19647838 (View on PubMed)

McBee AD, Wegner DJ, Carlson CS, Wambach JA, Yang P, Heins HB, Saugstad OD, Trusgnich MA, Watkins-Torry J, Nogee LM, Henderson H, Cole FS, Hamvas A. Recombination as a mechanism for sporadic mutation in the surfactant protein-C gene. Pediatr Pulmonol. 2008 May;43(5):443-50. doi: 10.1002/ppul.20782.

Reference Type: RESULT

PMID: 18383112 (View on PubMed)

Garmany TH, Wambach JA, Heins HB, Watkins-Torry JM, Wegner DJ, Bennet K, An P, Land G, Saugstad OD, Henderson H, Nogee LM, Cole FS, Hamvas A. Population and disease-based prevalence of the common mutations associated with surfactant deficiency. Pediatr Res. 2008 Jun;63(6):645-9. doi: 10.1203/PDR.0b013e31816fdbeb.

Reference Type: RESULT

PMID: 18317237 (View on PubMed)

Wambach JA, Yang P, Wegner DJ, An P, Hackett BP, Cole FS, Hamvas A. Surfactant protein-C promoter variants associated with neonatal respiratory distress syndrome reduce transcription. Pediatr Res. 2010 Sep;68(3):216-20. doi: 10.1203/PDR.0b013e3181eb5d68.

Reference Type: RESULT

PMID: 20539253 (View on PubMed)

Anadkat JS, Kuzniewicz MW, Chaudhari BP, Cole FS, Hamvas A. Increased risk for respiratory distress among white, male, late preterm and term infants. J Perinatol. 2012 Oct;32(10):780-5. doi: 10.1038/jp.2011.191. Epub 2012 Jan 5.

Reference Type: RESULT

PMID: 22222548 (View on PubMed)

Agrawal A, Hamvas A, Cole FS, Wambach JA, Wegner D, Coghill C, Harrison K, Nogee LM. An intronic ABCA3 mutation that is responsible for respiratory disease. Pediatr Res. 2012 Jun;71(6):633-7. doi: 10.1038/pr.2012.21. Epub 2012 Feb 15.

Reference Type: RESULT

PMID: 22337229 (View on PubMed)

Bereman MS, Tomazela DM, Heins HS, Simonato M, Cogo PE, Hamvas A, Patterson BW, Cole FS, MacCoss MJ. A method to determine the kinetics of multiple proteins in human infants with respiratory distress syndrome. Anal Bioanal Chem. 2012 Jun;403(8):2397-402. doi: 10.1007/s00216-012-5953-3. Epub 2012 Apr 14.

Reference Type: RESULT

PMID: 22526637 (View on PubMed)

Wambach JA, Wegner DJ, Depass K, Heins H, Druley TE, Mitra RD, An P, Zhang Q, Nogee LM, Cole FS, Hamvas A. Single ABCA3 mutations increase risk for neonatal respiratory distress syndrome. Pediatrics. 2012 Dec;130(6):e1575-82. doi: 10.1542/peds.2012-0918. Epub 2012 Nov 19.

Reference Type: RESULT

PMID: 23166334 (View on PubMed)

Wambach JA, Wegner DJ, Heins HB, Druley TE, Mitra RD, Hamvas A, Cole FS. Synonymous ABCA3 variants do not increase risk for neonatal respiratory distress syndrome. J Pediatr. 2014 Jun;164(6):1316-21.e3. doi: 10.1016/j.jpeds.2014.02.021. Epub 2014 Mar 20.

Reference Type: RESULT

PMID: 24657120 (View on PubMed)

Wambach JA, Casey AM, Fishman MP, Wegner DJ, Wert SE, Cole FS, Hamvas A, Nogee LM. Genotype-phenotype correlations for infants and children with ABCA3 deficiency. Am J Respir Crit Care Med. 2014 Jun 15;189(12):1538-43. doi: 10.1164/rccm.201402-0342OC.

Reference Type: RESULT

PMID: 24871971 (View on PubMed)

Jackson T, Wegner DJ, White FV, Hamvas A, Cole FS, Wambach JA. Respiratory failure in a term infant with cis and trans mutations in ABCA3. J Perinatol. 2015 Mar;35(3):231-2. doi: 10.1038/jp.2014.236.

Reference Type: RESULT

PMID: 25712598 (View on PubMed)

Other Identifiers

R01HL082747

Identifier Type: NIH

Identifier Source: secondary_id

View Link

07-0156

Identifier Type: -

Identifier Source: org_study_id