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LINE-1 retrotransposon methylation in chorionic villi of first trimester miscarriages with aneuploidy

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Abstract

Purpose: High frequency of aneuploidy in meiosis and cleavage stage coincides with waves of epigenetic genome reprogramming that may indicate a possible association between epigenetic mechanisms and aneuploidy occurrence. This study aimed to assess the methylation level of the long interspersed repeat element 1 (LINE-1) retrotransposon in chorionic villi of first trimester miscarriages with a normal karyotype and aneuploidy. Methods: The methylation level was assessed at 19 LINE-1 promoter CpG sites in chorionic villi of 141 miscarriages with trisomy of chromosomes 2, 6, 8–10, 13–15, 16, 18, 20–22, and monosomy X using massive parallel sequencing. Results: The LINE-1 methylation level was elevated statistically significant in chorionic villi of miscarriages with both trisomy (45.2 ± 4.3%) and monosomy X (46.9 ± 4.2%) compared with that in induced abortions (40.0 ± 2.4%) (p < 0.00001). The LINE-1 methylation levels were specific for miscarriages with different aneuploidies and significantly increased in miscarriages with trisomies 8, 14, and 18 and monosomy X (p < 0.05). The LINE-1 methylation level increased with gestational age both for group of miscarriages regardless of karyotype (R = 0.21, p = 0.012) and specifically for miscarriages with trisomy 16 (R = 0.48, p = 0.007). LINE-1 methylation decreased with maternal age in miscarriages with a normal karyotype (R = − 0.31, p = 0.029) and with trisomy 21 (R = − 0.64, p = 0.024) and increased with paternal age for miscarriages with trisomy 16 (R = 0.38, p = 0.048) and monosomy X (R = 0.73, p = 0.003). Conclusion: Our results indicate that the pathogenic effects of aneuploidy in human embryogenesis can be supplemented with significant epigenetic changes in the repetitive sequences.

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Vasilyev, S. A., Tolmacheva, E. N., Vasilyeva, O. Y., Markov, A. V., Zhigalina, D. I., Zatula, L. A., … Lebedev, I. N. (2021). LINE-1 retrotransposon methylation in chorionic villi of first trimester miscarriages with aneuploidy. Journal of Assisted Reproduction and Genetics, 38(1), 139–149. https://doi.org/10.1007/s10815-020-02003-1

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