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Meta-Analysis
. 2019 Sep 2;10(1):3927.
doi: 10.1038/s41467-019-11881-8.

Variants in the fetal genome near pro-inflammatory cytokine genes on 2q13 associate with gestational duration

Xueping Liu  1 Dorte Helenius  2   3 Line Skotte  1 Robin N Beaumont  4 Matthias Wielscher  5 Frank Geller  1 Julius Juodakis  6 Anubha Mahajan  7 Jonathan P Bradfield  8   9 Frederick T J Lin  10 Suzanne Vogelezang  11   12   13 Mariona Bustamante  14   15   16 Tarunveer S Ahluwalia  17 Niina Pitkänen  18 Carol A Wang  19 Jonas Bacelis  20 Maria C Borges  21   22 Ge Zhang  23   24   25 Bruce A Bedell  26 Robert M Rossi  25   27 Kristin Skogstrand  2   28 Shouneng Peng  29   30 Wesley K Thompson  2   3 Vivek Appadurai  2   3 Debbie A Lawlor  21   22   31 Ilkka Kalliala  32   33 Christine Power  34 Mark I McCarthy  7   35   36 Heather A Boyd  1 Mary L Marazita  37   38 Hakon Hakonarson  8   39   40 M Geoffrey Hayes  10   41   42 Denise M Scholtens  43 Fernando Rivadeneira  11   13   44 Vincent W V Jaddoe  11   12   13 Rebecca K Vinding  17 Hans Bisgaard  17 Bridget A Knight  45 Katja Pahkala  18   46 Olli Raitakari  18   47 Øyvind Helgeland  48   49   50 Stefan Johansson  48   51 Pål R Njølstad  48   49 João Fadista  1   52 Andrew J Schork  2   3 Ron Nudel  2   3 Daniel E Miller  53 Xiaoting Chen  53 Matthew T Weirauch  27   53   54 Preben Bo Mortensen  2   55   56 Anders D Børglum  2   56   57 Merete Nordentoft  2   58   59 Ole Mors  2   60 Ke Hao  29   30 Kelli K Ryckman  26   61 David M Hougaard  2   28 Leah C Kottyan  27   53 Craig E Pennell  19 Leo-Pekka Lyytikainen  62   63 Klaus Bønnelykke  17 Martine Vrijheid  14   15   16 Janine F Felix  11   12   13 William L Lowe Jr  10 Struan F A Grant  8   39   40 Elina Hyppönen  34   64   65 Bo Jacobsson  6   66 Marjo-Riitta Jarvelin  67   68 Louis J Muglia  23   24   26   27 Jeffrey C Murray  26 Rachel M Freathy  4   69 Thomas M Werge  2   3   59 Mads Melbye  1   59   70 Alfonso Buil  2   3 Bjarke Feenstra  71
Affiliations
Meta-Analysis

Variants in the fetal genome near pro-inflammatory cytokine genes on 2q13 associate with gestational duration

Xueping Liu et al. Nat Commun. .

Abstract

The duration of pregnancy is influenced by fetal and maternal genetic and non-genetic factors. Here we report a fetal genome-wide association meta-analysis of gestational duration, and early preterm, preterm, and postterm birth in 84,689 infants. One locus on chromosome 2q13 is associated with gestational duration; the association is replicated in 9,291 additional infants (combined P = 3.96 × 10-14). Analysis of 15,588 mother-child pairs shows that the association is driven by fetal rather than maternal genotype. Functional experiments show that the lead SNP, rs7594852, alters the binding of the HIC1 transcriptional repressor. Genes at the locus include several interleukin 1 family members with roles in pro-inflammatory pathways that are central to the process of parturition. Further understanding of the underlying mechanisms will be of great public health importance, since giving birth either before or after the window of term gestation is associated with increased morbidity and mortality.

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Conflict of interest statement

D.A.L. received support from Roche Diagnostics and Medtronic for biomarker research unrelated to the work presented in this paper. M.I.M. serves on advisory panels for Pfizer, NovoNordisk, Zoe Global; has received honoraria from Merck, Pfizer, NovoNordisk, and Eli Lilly; has stock options in Zoe Global; has received research funding from Abbvie, Astra Zeneca, Boehringer Ingelheim, Eli Lilly, Janssen, Merck, NovoNordisk, Pfizer, Roche, Sanofi Aventis, Servier & Takeda. S.F.A.G. has received support from GSK for research that is not related to the study presented in this paper. T.M.W. has acted as lecturer and scientific advisor to H. Lundbeck A/S. The remaining authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Discovery stage results at the 2q13 locus. Regional association plots for a gestational duration and b postterm birth. SNP position is shown on the x-axis and association (−log10 P value) with gestational duration and postterm birth, respectively, on the left y-axis. The lead SNP, rs7594852, from the gestational duration analysis is represented by a purple diamond, and the other SNPs are colored to reflect their LD with the lead SNP (based on pairwise r2 values from the Danish National Birth Cohort). In the postterm birth analysis, rs7607470 had a slightly lower P value, but this SNP is highly correlated with rs7594852 (r2 > 0.99), and the latter SNP was selected for the replication stage analyses of both gestational duration and postterm birth. Estimated recombination rates are from HapMap (right y-axis)
Fig. 2
Fig. 2
Forest plots showing association results for rs7594852. a Gestational duration effect estimates with 95% CIs, and b postterm birth ORs with 95% CIs. Source data are provided as a Source Data file
Fig. 3
Fig. 3
HIC1 binding at the 2q13 locus. a The rs7594852-C allele creates a stronger binding site for the hypermethylated in cancer 1 (HIC1) protein. The sequence logo of the HIC1-binding motif shows the DNA binding preferences of HIC1. Tall nucleotides above the dashed line indicate DNA bases that are preferred by HIC1, whereas bases below the dashed line are disfavored. The y-axis indicates the relative free energies of binding for each nucleotide at each position. The height of each nucleotide can be interpreted as the free energy difference from the average (ΔΔG) in units of gas constant (R) and temperature (T). The DNA sequence flanking the rs7594852-C allele is shown directly below, with the alternative rs7594852-T allele shown at the bottom. The rs7594852-T allele changes the HIC1 binding site sequence from C (most favored) to T (less favored). b UC Santa Cruz Genome Browser screenshot depicting the rs7594852 locus. The purple (CKAP2L) and black (IL1A) graphics at the top indicate the locations of exons (columns), untranslated regions (rectangles), and introns (horizontal lines), with arrows indicating the direction of transcription. The red vertical line indicates the position of rs7594852, which overlaps strong signals obtained from chromatin immunoprecipitation sequencing (ChIP-seq) experiments (indicating histone modification by mono-, di-, or trimethylation of histone H3 on lysine 4; H3K4) in trophoblast cultured cells, placental amnion, or fetal placenta. c Experimental validation of allele-dependent binding of human purified recombinant HIC1 protein with a c-Myc/DDK tag to rs7594852 and flanking sequence via electrophoretic mobility shift assay (EMSA). Arrows indicate allele-dependent binding of HIC1 (bottom arrow) and a supershift of the protein–DNA complex induced by the binding of the anti-DDK antibody to the complex (top arrow). The presence of multiple bands in lanes 3 and 4 is likely due to the presence of multiple HIC1 isoforms. Source data are provided as a Source Data file

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