# Association between shortened maternal and fetal telomere length and abnormal fetal development

## TL;DR

Shortened telomeres in mothers and fetuses are linked to abnormal fetal development, suggesting maternal telomere length could predict developmental risks.

## Contribution

This study demonstrates a novel association between maternal and fetal telomere shortening and fetal developmental anomalies.

## Key findings

- Fetal telomeres were significantly shorter in cases with congenital anomalies compared to controls.
- Maternal telomere length was also reduced in these cases and correlated with fetal telomere length.
- Maternal telomere length showed 92% specificity and 73% sensitivity in identifying cases of congenital anomalies.

## Abstract

A number of intrinsic, maternal and environmental factors have been linked to the risk of fetal developmental anomalies. In a previous study, we showed that telomere length (TL) was notably reduced in amniotic fluid when the fetus exhibited a developmental anomaly. In this new study, we measured the fetal and maternal TL for 75 evolutive pregnancies with congenital malformation. We also measured the TL of 50 pregnant women without fetal anomalies and 50 non-pregnant control women who had at least one child with normal development. In fetal samples, telomeres were significantly shortened in cases with congenital anomalies compared to controls (n  =  93) (P  <  0.0001). Interestingly, age-adjusted maternal TL was also significantly reduced in these cases (P  <  0.01). Receiver operating characteristic (ROC) analysis showed that maternal TL, at the optimal cut-off value, identified cases of congenital anomalies with 92% specificity and 73% sensitivity. In addition, fetal and maternal TL were correlated, with 15% to 38% of the variance in fetal TL attributable to maternal TL. Telomere shortening can lead to increased sensitivity to various maternal exposure factors and may contribute to compromised organogenesis, possibly due to inadequate cell proliferation or genomic instability. Measuring maternal TL during the periconceptional period could serve as a useful predictive biomarker for assessing the risk of fetal developmental anomalies.