Cord blood epigenetic gestational age acceleration in monochorionic versus dichorionic twins
In an abstract on cord blood DNA methylation from 49 monozygotic twin pairs, full-term monochorionic twins showed higher epigenetic gestational age acceleration than full-term dichorionic twins, an association, not a cause. [1]
Automatic summary · not editorially reviewed
The key findings
The abstract analyzed cord blood DNA methylation from 49 monozygotic twin pairs, 26 DCDA and 23 MCDA. [1]
Among full-term neonates, one clock found significantly higher GAA in MCDA twins (0.34 ± 0.96 vs. −0.27 ± 0.80 weeks; p = 0.010), while the other showed a similar trend without significance (p = 0.11). [1]
Regression associated MCDA chorionicity with higher GAA among full-term twins (β = 0.64 weeks; 95% CI 0.02–1.26; p = 0.044), and preterm birth was not significantly associated with GAA by either clock. [1]
The source at a glance
- Study type / format
- Abstract of a cord blood DNA methylation study comparing chorionicity groups
- Population / context
- Cord blood from 49 monozygotic twin pairs (26 DCDA, 23 MCDA), with comparisons among full-term neonates.
- Summary based on
- Study abstract
- Publication status
- Preprint · peer-review status not confirmed
- Original publication
- August 25, 2026
Chorionicity groups in 49 monozygotic twin pairs
The abstract describes cord blood DNA methylation data from 49 monozygotic twin pairs: 26 dichorionic diamniotic (DCDA) and 23 monochorionic diamniotic (MCDA). The two types differ in placental sharing and hemodynamic environment. Gestational age acceleration (GAA) was estimated with two DNA methylation-based gestational age clocks, and the groups were compared among full-term neonates.
Supporting source [1]
Higher GAA in MCDA by one clock, trend by the other
Both clocks showed good within-pair GAA concordance, and GAA was consistently higher in MCDA than in DCDA pairs. Among full-term neonates, one clock found significantly higher GAA in MCDA twins (0.34 ± 0.96 vs. −0.27 ± 0.80 weeks; p = 0.010); the other showed a similar directional trend without statistical significance (p = 0.11). Regression gave β = 0.64 weeks (95% CI 0.02–1.26; p = 0.044) for MCDA versus DCDA among full-term twins, robust in most sensitivity analyses adjusting for clinical and obstetric covariates. Preterm birth was not significantly associated with GAA by either clock.
Supporting source [1]
Association, not causation, in an abstract only
The authors conclude that among full-term twins, chorionicity was independently associated with GAA, with MCDA twins showing higher epigenetic maturity than DCDA twins despite the same gestational age at birth. They suggest the hemodynamic environment linked to placental sharing, rather than gestational age at birth alone, may contribute to epigenetic maturation, and that chorionicity should be further investigated as a possible biological variable for neonatal risk stratification. This is a proposed direction, not an established risk tool.
Supporting source [1]
How to interpret this
This explainer is based only on the abstract; the full text was not reviewed. The abstract reports an association in full-term twins, not a cause, and one of the two clocks did not reach significance. The proposed use of chorionicity for neonatal risk stratification is a suggestion, not a validated tool.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Cho L, Kim JH, Jun JK, Lee SD, Park J, Kim S, Park JS, Lee HY, Lee SM. · europepmc.org · August 25, 2026