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Genome‐wide association mapping of acute lung injury in neonatal inbred mice
Author(s) -
Nichols Jennifer L.,
Gladwell Wesley,
Verhein Kirsten C.,
Cho HyeYoun,
Wess Jürgen,
Suzuki Oscar,
Wiltshire Tim,
Kleeberger Steven R.
Publication year - 2014
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.13-247221
Subject(s) - hyperoxia , single nucleotide polymorphism , bronchopulmonary dysplasia , candidate gene , biology , genome wide association study , snp , quantitative trait locus , lung , bronchoalveolar lavage , pathogenesis , nonsynonymous substitution , pathology , immunology , genetics , genotype , gene , medicine , genome , gestational age , pregnancy
Reactive oxygen species (ROS) contribute to the pathogenesis of many acute and chronic pulmonary disorders, including bronchopulmonary dysplasia (BPD), a respiratory condition that affects preterm infants. However, the mechanisms of susceptibility to oxidant stress in neonatal lungs are not completely understood. We evaluated the role of genetic background in response to oxidant stress in the neonatal lung by exposing mice from 36 inbred strains to hyperoxia (95% O 2 ) for 72 h after birth. Hyperoxia‐induced lung injury was evaluated by using bronchoalveolar lavage fluid (BALF) analysis and pathology. Statistically significant interstrain variation was found for BALF inflammatory cells and protein (heritability estimates range: 33.6–55.7%). Genome‐wide association mapping using injury phenotypes identified quantitative trait loci (QTLs) on chromosomes 1, 2, 4, 6, and 7. Comparative mapping of the chromosome 6 QTLs identified Chrm2 (cholinergic receptor, muscarinic 2, cardiac) as a candidate susceptibility gene, and mouse strains with a nonsynonymous coding single‐nucleotide polymorphism (SNP) in Chrm2 that causes an amino acid substitution (P265L) had significantly reduced hyperoxia‐induced inflammation compared to strains without the SNP. Further, hyperoxia‐induced lung injury was significantly reduced in neonatal mice with targeted deletion of Chrm2 , relative to wild‐type controls. This study has important implications for understanding the mechanisms of oxidative lung injury in neonates.—Nichols, J. L., Gladwell, W., Verhein, K. C., Cho, H.‐Y., Wess, J., Suzuki, O., Wiltshire, T., Kleeberger, S. R. Genome‐wide association mapping of acute lung injury in neonatal inbred mice. FASEB J . 28, 2538–2550 (2014). www.fasebj.org