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Genetic Disorders of Surfactant Metabolism
Rebekah J Nevel1, Steven K Brennan2, Jennifer A Wambach3
1Division of Pediatric Pulmonary, Allergy/Immunology, and Sleep Medicine, Department of Pediatrics, University of Missouri School of Medicine and Children's Hospital, Columbia, Missouri.
Genetic disorders impacting surfactant proteins like SP-B and SP-C, and ABCA3 or NKX2-1 genes, cause severe neonatal respiratory failure. Early diagnosis and expert care are crucial for affected infants and families.
Area of Science:
- Neonatal Medicine
- Genetics
- Respiratory Medicine
Background:
- Genetic disorders affecting surfactant protein production and function lead to respiratory distress and failure in neonates.
- Pathogenic variants in SFTPB, SFTPC, ABCA3, and NKX2-1 genes disrupt surfactant metabolism and function.
- These genetic alterations impact alveolar epithelial type 2 cells and surfactant-associated gene transcription.
Purpose of the Study:
- To highlight the clinical significance of genetic disorders in surfactant metabolism.
- To emphasize the diagnostic challenges and variable prognoses associated with these conditions.
- To inform neonatologists and pulmonologists about early recognition and management strategies.
Main Methods:
- Review of genetic variants affecting surfactant protein B (SFTPB), surfactant protein C (SFTPC), adenosine triphosphate binding cassette transporter A3 (ABCA3), and NKX2-1 genes.
- Analysis of clinical presentations, diagnostic considerations, and patient outcomes.
- Discussion of the impact of genetic mutations on surfactant production, function, and cellular processes.
Main Results:
- Loss-of-function variants in SFTPB and ABCA3 impair SP-B production and ABCA3 function.
- Gain-of-function variants in SFTPC disrupt SP-C processing and trafficking.
- NKX2-1 gene variants lead to haploinsufficiency, affecting surfactant and other gene transcription.
Conclusions:
- Genetic disorders of surfactant metabolism present with variable clinical features and prognoses, ranging from mild respiratory issues to fatal respiratory failure.
- A high index of clinical suspicion is necessary for early diagnosis.
- Timely identification, appropriate care, genetic counseling, and family risk assessment are essential for managing these rare neonatal conditions.
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