Assisted reproductive technologies impair the expression and methylation of insulin-induced gene 1 and sterol regulatory element-binding factor 1 in the fetus and placenta.

Hangying Lou, Fang Le, Yingming Zheng, Lejun Li, Liya Wang, Ning Wang, Yimin Zhu, Hefeng Huang, Fan Jin

Journal: Fertility and sterility 2014;101(4):974-980.e2

PMID: 24484994

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Abstract

OBJECTIVE

To evaluate the cholesterol metabolism linked to assisted reproductive technology (ART) by analyzing the expression levels and DNA methylation patterns of the insulin-induced gene (INSIG), sterol regulatory element-binding protein (SREBP), and SREBP cleavage-activating protein in the fetus and placenta.

DESIGN

Experimental research study.

SETTING

An IVF center, university-affiliated teaching hospital.

PATIENT(S)

Four patients groups were recruited: pregnancies after IVF/intracytoplasmic sperm injection (ICSI) (n = 55), natural pregnancies (n = 40), multifetal reduction after IVF/ICSI (n = 56), and multifetal reduction after controlled ovarian hyperstimulation (COH) (n = 42).

INTERVENTION(S)

Expression and DNA methylation of INSIG-SREBP- SREBP cleavage-activating protein in the fetus and placenta samples were determined.

MAIN OUTCOME MEASURE(S)

The expression and DNA methylation patterns were tested by real-time quantitative polymerase chain reaction (PCR) and pyrosequencing.

RESULT(S)

In the ICSI treatment group, significantly higher levels of triglycerides and apolipoprotein-B were observed in cord blood compared with controls. Meanwhile, in ICSI-conceived fetuses, the expression of INSIG1 was significantly higher, and methylation rates were lower, than in the IVF and control groups. Furthermore, in the placenta, the INSIG1 and SREBF1 transcripts were also significantly higher with lower methylation rates in the ICSI group than in the IVF and control groups.

CONCLUSION(S)

Our results indicated that the dysregulation of INSIG1 and SREBF1 caused by ART were observed not only in the fetus but also in the placenta, primarily in the ICSI group. However, the long-term sequelae of this dysregulation should be closely followed.

Address: Center of Reproductive Medicine, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, People's Republic of China; Key Laboratory of Reproductive Genetics, Ministry of Education, Hangzhou, People's Republic of China.; Center of Reproductive Medicine, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, People's Republic of China.; Center of Reproductive Medicine, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, People's Republic of China; Key Laboratory of Reproductive Genetics, Ministry of Education, Hangzhou, People's Republic of China. Electronic address: [email protected].

DOI: 10.1016/j.fertnstert.2013.12.034