Altered DNA methylation and expression of PLAGL1 in cord blood from assisted reproductive technology pregnancies compared with natural conceptions

PLAGL1 methylation and expression was observed to be altered in cord blood from assisted reproductive technology pregnancies with possible implications on an imprinted gene network.

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Volume 106, Issue 3, Pages 739-748

Authors:

Rebecca N. Vincent, M.Sc., Luke D. Gooding, B.Sc., Kenny Louie, B.Sc., Edgar Chan Wong, M.Sc., Sai Ma, Ph.D.

Abstract:

Objective

To investigate DNA methylation and expression of imprinted genes and an imprinted gene network (IGN) in neonates conceived via assisted reproductive technology (ART).

Design

Case control.

Setting

Research institution.

Patient(s)

Two hundred sixty-four cases of cord blood and/or placental villi from neonates (101 IVF, 81 ICSI, 82 naturally conceived).

Intervention(s)

Placentas were obtained at birth for biopsy and cord blood extraction.

Main Outcome Measure(s)

DNA methylation and expression of imprinted genes.

Result(s)

DNA methylation at the PLAGL1 differentially methylated region (DMR) was significantly higher in IVF cord blood (48.0%) compared with controls (46.0%). No differences were found in DNA methylation between conception modes for KvDMR1 and LINE-1 in cord blood and placenta as well as PLAGL1 and PEG10 in placenta villi. PLAGL1 expression was lower in both IVF and ICSI cord blood groups than in controls (relative quantification of 0.65, 0.74, 0.89, respectively). Analyzing the expression of 3 genes in a PLAGL1 regulated IGN revealed different expression between conception modes and a significant correlation to PLAGL1expression in only one (KCNQ1OT1).

Conclusion(s)

Our results suggest a stability of DNA methylation at imprinted DMRs; however, we show PLAGL1methylation/expression to be altered after ART. As PLAGL1 expression correlated with only one of the three IGN genes in cord blood, we propose there is a more complex mechanism of regulating the IGN that may involve other genes and epigenetic modifications in this tissue. Further research investigating IGN-implicated genes in various neonatal tissues is warranted to elucidate the full effects ART-induced alterations to PLAGL1and the IGN may have on fetal growth/development.


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Fertility and Sterility

Editorial Office, American Society for Reproductive Medicine

Fertility and Sterility® is an international journal for obstetricians, gynecologists, reproductive endocrinologists, urologists, basic scientists and others who treat and investigate problems of infertility and human reproductive disorders. The journal publishes juried original scientific articles in clinical and laboratory research relevant to reproductive endocrinology, urology, andrology, physiology, immunology, genetics, contraception, and menopause. Fertility and Sterility® encourages and supports meaningful basic and clinical research, and facilitates and promotes excellence in professional education, in the field of reproductive medicine.

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