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HHIP, HDAC4, NCR3 and RARB polymorphisms affect fetal, childhood and adult lung function

Samuel A. Collins, Jane S.A. Lucas, Hazel M. Inskip, Keith M. Godfrey, Graham Roberts, John W. Holloway
European Respiratory Journal 2013 41: 756-757; DOI: 10.1183/09031936.00171712
Samuel A. Collins
Clinical and Experimental Sciences Academic Unit, University of Southampton Faculty of MedicineNIHR Southampton Respiratory Biomedical Research Unit, University of Southampton and University Hospital Southampton NHS Foundation Trust
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  • For correspondence: samacollins@gmail.com
Jane S.A. Lucas
Clinical and Experimental Sciences Academic Unit, University of Southampton Faculty of MedicineNIHR Southampton Respiratory Biomedical Research Unit, University of Southampton and University Hospital Southampton NHS Foundation Trust
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Hazel M. Inskip
Human Development and Health Academic Unit, University of Southampton Faculty of MedicineSouthampton Medical Research Council Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK
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Keith M. Godfrey
Human Development and Health Academic Unit, University of Southampton Faculty of MedicineSouthampton Medical Research Council Lifecourse Epidemiology Unit, University of Southampton, Southampton, UKNIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust
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Graham Roberts
Clinical and Experimental Sciences Academic Unit, University of Southampton Faculty of MedicineNIHR Southampton Respiratory Biomedical Research Unit, University of Southampton and University Hospital Southampton NHS Foundation TrustHuman Development and Health Academic Unit, University of Southampton Faculty of Medicine
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John W. Holloway
Clinical and Experimental Sciences Academic Unit, University of Southampton Faculty of MedicineHuman Development and Health Academic Unit, University of Southampton Faculty of Medicine
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Southampton Medical Research Council Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK
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To the Editor:

Impaired lung function, and consequent respiratory morbidity including asthma and chronic obstructive pulmonary disease, may have their origins in early life [1–3]. Genome-wide analysis studies (GWAS) have identified a number of single-nucleotide polymorphisms (SNPs) in those of European ancestry that affect adult lung function, as measured by forced expiratory volume in 1 s (FEV1) and FEV1/forced vital capacity (FVC) ratio. 23 of these SNPs have directionally consistent effects on both FEV1 and FEV1/FVC in children and adults [4].

During 1998–2002, the Southampton Women’s Survey recruited 12,579 females pre-conception through their general practitioners [5]. By the end of 2003, there had been 1,973 babies born to these females, of which 147 had infant lung function measured between 5 and 14 weeks of age, according to previously published protocols [6] using raised volume/rapid compression techniques to measure maximal expiratory flow at functional residual capacity (V′max,FRC), FEV0.4, respiratory rate and compliance. DNA was obtained from cord blood samples or from buccal samples taken at the 6-yr follow-up. DNA from these 147 children was analysed for each of the 23 SNPs identified as above. These SNPs are detailed in table 1.

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Table 1– Single-nucleotide polymorphism (SNP) code, target gene, chromosome and minor allele of the 23 analysed SNPs associated with adult lung function and previously showing directionally consistent effects in children, and SNPs and their target genes showing significant associations with lung function in infants along with the mean values of the relevant parameter according to the minor allele count

Linear regression was used to analyse the minor allele count for each SNP (either 0, 1 or 2) against logarithmically transformed and age-adjusted values for infant lung compliance, respiratory rate, FEV0.4 and V′max,FRC. Smoking in pregnancy, maternal body mass index, social class, birth weight, gestation and crown–rump length were analysed as potential confounding factors. The average n per group (0, 1 or 2 minor alleles) across all 23 SNPs was 71, 50 and 9, respectively, giving 80% power to detect a 3.7-mL·mmH2O−1 change in compliance per increase in minor allele count.

Five SNPs, relating to four genes, showed significant associations with infant lung function (table 1). Hedgehog interacting protein (HHIP) had one SNP (rs11100860) that was associated with increased compliance (p<0.001) and one (rs1032296) associated with decreased compliance (p<0.05). Retinoic acid receptor β (RARB) (rs1529672) was associated with increased V′max,FRC (p<0.05), the natural cytotoxicity triggering receptor 3 (NCR3) SNP (rs2857595) was associated with a lower respiratory rate (p<0.05), and the histone deacetylase 4 (HDAC4) SNP (rs12477314) was associated with both increased compliance and V′max,FRC (both p<0.05). Table 1 summarises these findings. These effects were all directionally consistent with the previous GWAS.

HHIP is known to have a role in lung development through fibroblast growth factor 10 (FGF10) and its control of lung branching [7], while RARB regulates lung bud formation and branching through the Wnt pathway [8] with retinoic acid playing a central role in pre- and post-natal lung development in humans [9]. HDAC4 and NCR3 have uncertain roles in lung development, though the former may modulate epigenetic effects on lung function.

Branching of the lung occurs in the pseudoglandular phase and is complete by 16 weeks of gestation [10]; therefore, RARB and HHIP are likely to have their effects in the first trimester. Early branching is the primary determinant of resistance in normal lungs and, therefore, of compliance. This large airway function is reflected as FEV1 and FEV1/FVC in later life; thus, there is a scientifically plausible link between these SNPs and lung function.

As there was a priori evidence of association between these SNPs and lung function, we have not corrected for the number of SNPs and lung function tests. However, even if a Bonferroni correction is applied (23 SNPs × 4 lung function measurements), the rs11100860 HHIP SNP remains significant. As the original GWAS was in similar populations to our cohort, we feel it reasonable to assume the key SNPs identified may be good proxy markers of the causal locus. It is also possible that the present study was underpowered to detect significant associations between infant lung function and the other SNPs tested.

We accept that small numbers and multiple testing are limitations of our study; however, these results may link early fetal lung development, through infant lung function, to adult lung function and respiratory morbidity in later life. This is an interesting starting point for identification of the mechanisms of fetal origins of lung function.

Footnotes

  • Statement of Interest

    Astatement of interest forK.M.Godfrey can be found at www.erj.ersjournals.com/site/misc/statements.xhtml

  • ©ERS 2013

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HHIP, HDAC4, NCR3 and RARB polymorphisms affect fetal, childhood and adult lung function
Samuel A. Collins, Jane S.A. Lucas, Hazel M. Inskip, Keith M. Godfrey, Graham Roberts, John W. Holloway, the Southampton Women’s Survey Study Group
European Respiratory Journal Mar 2013, 41 (3) 756-757; DOI: 10.1183/09031936.00171712

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HHIP, HDAC4, NCR3 and RARB polymorphisms affect fetal, childhood and adult lung function
Samuel A. Collins, Jane S.A. Lucas, Hazel M. Inskip, Keith M. Godfrey, Graham Roberts, John W. Holloway, the Southampton Women’s Survey Study Group
European Respiratory Journal Mar 2013, 41 (3) 756-757; DOI: 10.1183/09031936.00171712
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