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Nkoy FL, Stone BL, Deering-Rice CE, Zhu A, Lamb JG, Rower JE, Reilly CA. Impact of CYP3A5 Polymorphisms on Pediatric Asthma Outcomes. Int J Mol Sci 2024; 25:6548. [PMID: 38928254 PMCID: PMC11203737 DOI: 10.3390/ijms25126548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 06/03/2024] [Accepted: 06/11/2024] [Indexed: 06/28/2024] Open
Abstract
Genetic variation among inhaled corticosteroid (ICS)-metabolizing enzymes may affect asthma control, but evidence is limited. This study tested the hypothesis that single-nucleotide polymorphisms (SNPs) in Cytochrome P450 3A5 (CYP3A5) would affect asthma outcomes. Patients aged 2-18 years with persistent asthma were recruited to use the electronic AsthmaTracker (e-AT), a self-monitoring tool that records weekly asthma control, medication use, and asthma outcomes. A subset of patients provided saliva samples for SNP analysis and participated in a pharmacokinetic study. Multivariable regression analysis adjusted for age, sex, race, and ethnicity was used to evaluate the impact of CYP3A5 SNPs on asthma outcomes, including asthma control (measured using the asthma symptom tracker, a modified version of the asthma control test or ACT), exacerbations, and hospital admissions. Plasma corticosteroid and cortisol concentrations post-ICS dosing were also assayed using liquid chromatography-tandem mass spectrometry. Of the 751 patients using the e-AT, 166 (22.1%) provided saliva samples and 16 completed the PK study. The e-AT cohort was 65.1% male, and 89.6% White, 6.0% Native Hawaiian, 1.2% Black, 1.2% Native American, 1.8% of unknown race, and 15.7% Hispanic/Latino; the median age was 8.35 (IQR: 5.51-11.3) years. CYP3A5*3/*3 frequency was 75.8% in White subjects, 50% in Native Hawaiians and 76.9% in Hispanic/Latino subjects. Compared with CYP3A5*3/*3, the CYP3A5*1/*x genotype was associated with reduced weekly asthma control (OR: 0.98; 95% CI: 0.97-0.98; p < 0.001), increased exacerbations (OR: 6.43; 95% CI: 4.56-9.07; p < 0.001), and increased asthma hospitalizations (OR: 1.66; 95% CI: 1.43-1.93; p < 0.001); analysis of 3/*3, *1/*1 and *1/*3 separately showed an allelic copy effect. Finally, PK analysis post-ICS dosing suggested muted changes in cortisol concentrations for patients with the CYP3A5*3/*3 genotype, as opposed to an effect on ICS PK. Detection of CYP3A5*3/3, CYPA35*1/*3, and CYP3A5*1/*1 could impact inhaled steroid treatment strategies for asthma in the future.
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Affiliation(s)
- Flory L. Nkoy
- Department of Pediatrics, University of Utah School of Medicine, 100 N. Mario Capecchi Drive, Salt Lake City, UT 84113, USA; (F.L.N.); (B.L.S.); (A.Z.)
| | - Bryan L. Stone
- Department of Pediatrics, University of Utah School of Medicine, 100 N. Mario Capecchi Drive, Salt Lake City, UT 84113, USA; (F.L.N.); (B.L.S.); (A.Z.)
| | - Cassandra E. Deering-Rice
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, 30 S 2000 E, Room 201 Skaggs Hall, Salt Lake City, UT 84112, USA; (C.E.D.-R.); (J.G.L.); (J.E.R.)
| | - Angela Zhu
- Department of Pediatrics, University of Utah School of Medicine, 100 N. Mario Capecchi Drive, Salt Lake City, UT 84113, USA; (F.L.N.); (B.L.S.); (A.Z.)
| | - John G. Lamb
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, 30 S 2000 E, Room 201 Skaggs Hall, Salt Lake City, UT 84112, USA; (C.E.D.-R.); (J.G.L.); (J.E.R.)
| | - Joseph E. Rower
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, 30 S 2000 E, Room 201 Skaggs Hall, Salt Lake City, UT 84112, USA; (C.E.D.-R.); (J.G.L.); (J.E.R.)
| | - Christopher A. Reilly
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, 30 S 2000 E, Room 201 Skaggs Hall, Salt Lake City, UT 84112, USA; (C.E.D.-R.); (J.G.L.); (J.E.R.)
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Busby J, McDowell PJ, Pfeffer PE, Mansur AH, Heaney LG. Ethnic variation in asthma phenotypic presentation and outcomes: a cross-sectional analysis of the UK Biobank. Thorax 2024; 79:186-190. [PMID: 38071553 DOI: 10.1136/thorax-2023-221101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Ethnic disparities exist within asthma; however, country of birth is rarely investigated. We described demographic and clinical characteristics by ethnicity and country of birth within the UK Biobank. Lung function and asthma hospitalisations were similar for white, black and North-East Asian participants, however, South-East (SE) Asians more commonly had an FEV1 below the lower limits of normal (LLN; 53.8% vs 32.3%, p<0.001), blood eosinophilia (38.6% vs 23.8%, p<0.001) and asthma hospitalisation (12.5% vs 8.3%, p<0.001) than white participants. First-generation SE Asian immigrants had poorer lung function (57.7% vs 27.7% FEV1 below LLN, p<0.001) than UK/Ireland born participants. These data demonstrate inter-ethnic and intra-ethnic disparities.
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Affiliation(s)
- John Busby
- Centre for Public Health, Queen's University Belfast School of Medicine Dentistry and Biomedical Sciences, Belfast, UK
| | - P Jane McDowell
- Centre for Experimental Medicine, Queen's University Belfast School of Medicine Dentistry and Biomedical Sciences, Belfast, UK
- Belfast Health & Social Care NHS Trust, Belfast, UK
| | | | - Adel Hasan Mansur
- University of Birmingham & Heartlands Hospital, University Hospitals Birmingham, Birmingham, UK
| | - Liam G Heaney
- Centre for Experimental Medicine, Queen's University Belfast School of Medicine Dentistry and Biomedical Sciences, Belfast, UK
- Belfast Health & Social Care NHS Trust, Belfast, UK
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