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Rationale and Design of the Alpha-1 Biomarkers Consortium Study.

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Area of Science:

  • Pulmonary Medicine
  • Genetics
  • Biomarker Research

Background:

  • Alpha-1 antitrypsin deficiency (AATD) is a primary genetic driver of chronic obstructive pulmonary disease (COPD).
  • Significant variability in clinical presentation and disease progression exists among individuals with AATD, despite shared genetic variants.
  • Understanding this heterogeneity is crucial for personalized management strategies.

Purpose of the Study:

  • To investigate how computed tomography (CT) imaging and serum/airway biomarkers explain phenotypic variability in AATD.
  • To identify factors associated with disease severity and progression in individuals with AATD.
  • To establish a comprehensive longitudinal cohort for deep phenotyping of AATD.

Main Methods:

  • A multi-center longitudinal study of 270 adult PiZZ AATD participants over 3 years.
  • Data collection includes spirometry, patient-reported outcomes, biosampling (blood, sputum, nasal mucosa), and chest CT imaging.
  • Genetic analysis (SERPINA1 sequencing) and iPSC generation from PBMCs will be performed.

Main Results:

  • Deep characterization of the AATD cohort through cross-sectional and longitudinal imaging, physiological, and symptomatological data.
  • Quantitative emphysema measures and novel airway remodeling metrics derived from CT imaging.
  • A validation cohort in Ireland will independently enroll patients using identical procedures.

Conclusions:

  • This study represents the first AATD cohort to integrate detailed quantitative emphysema measures and advanced imaging.
  • The findings aim to elucidate the underlying mechanisms of AATD heterogeneity.
  • Identification of key factors influencing disease severity and progression in AATD.