Clinical, Histopathological, and Molecular Diagnostics in Lethal Lung Developmental Disorders

Area of Science:

• Pediatric Pulmonology
• Medical Genetics
• Developmental Biology

Background:

• Lethal lung developmental disorders present as neonatal respiratory failure.
• Histopathological diagnosis is challenging due to overlapping features.
• Genetic underpinnings of some disorders, like alveolar capillary dysplasia, are known, but others remain unclear.

Purpose of the Study:

• To investigate the molecular basis of acinar dysplasia and congenital alveolar dysplasia.
• To highlight the role of noncoding regulatory elements in human lung development.
• To propose an improved diagnostic pathway for lethal lung developmental disorders.

Main Methods:

• Review of genetic studies on lethal lung developmental disorders.
• Application of next-generation sequencing techniques (exome and whole-genome sequencing).
• Analysis of the TBX4-FGF10-FGFR2 signaling pathway.

Main Results:

• Identified disruption of the TBX4-FGF10-FGFR2 pathway in acinar and congenital alveolar dysplasia.
• Demonstrated complex compound inheritance patterns.
• Confirmed the critical role of noncoding regulatory elements in lung development.

Conclusions:

• Noncoding regulatory elements are crucial for human lung development.
• Whole-genome sequencing should be integrated into diagnostic protocols for these disorders.
• Improved diagnostics can inform recurrence risk assessment.