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Updated: Sep 3, 2025

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
Variable expressivity in a four-generation ACDMPV family with a non-coding hypermorphic SNV in trans to the
Esra Yıldız Bölükbaşı1, Justyna A Karolak2, Przemyslaw Szafranski1
1Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, TX, USA.
Genetic variants in the FOXF1 gene and its enhancer region are linked to Alveolar Capillary Dysplasia with Misalignment of Pulmonary Veins (ACDMPV). Non-coding variants in the enhancer can rescue the lethal ACDMPV phenotype, supporting a gene dosage model.
Area of Science:
- Genetics
- Developmental Biology
- Neonatal Medicine
Background:
- Alveolar Capillary Dysplasia with Misalignment of Pulmonary Veins (ACDMPV) is a lethal neonatal lung disorder.
- Genetic defects in FOXF1 or its lung-specific enhancer at 16q24.1 are found in 80-90% of ACDMPV patients.
Observation:
- A four-generation family exhibited a FOXF1 frameshifting variant (c.881_902dup) and ACDMPV or pulmonary arterial hypertension (PAH).
- The proband's mother, a healthy carrier of the FOXF1 frameshift variant, also carried a non-coding SNV (rs560517434-A) in the FOXF1 enhancer region.
Findings:
- The non-coding SNV in the FOXF1 enhancer significantly increased FOXF1 promoter activity (10-fold) in vitro.
- This suggests that non-coding variants in the FOXF1 enhancer can modify the ACDMPV phenotype.
Implications:
- These findings support a compound inheritance and gene dosage model for ACDMPV.
- Non-coding regulatory variants in the FOXF1 enhancer may act as modifiers, potentially rescuing the lethal ACDMPV phenotype.
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