Gene expression pattern of IGF2, PHLDA2, PEG10 and CDKN1C imprinted genes in spontaneous miscarriages or fetal deaths
EPIGENETICS
Authors: Doria, Sofia; Sousa, Mario; Fernandes, Susana; Ramalho, Carla; Brandao, Otilia; Matias, Alexandra; Barros, Alberto; Carvalho, Filipa
Abstract
Genomic imprinting is defined as an epigenetic modification that leads to parent-of-origin specific monoallelic expression. Some current research on the fetal control growth has been focused on the study of genes that display imprinted expression in utero. Four imprinted genes, two paternally expressed (IGF2 and PEG10) and two maternally expressed (PHLDA2 and CDKN1C), are well known to play a role in fetal growth and placental development. Pregnancy loss in the general reproductive population is a very common occurrence and other genetic causes beyond chromosomal abnormalities could be involved in spontaneous miscarriages or fetal deaths, such as alteration of expression in imprinted genes particularly those related to fetal or placental growth. Quantitative Real Time PC R was performed to evaluate gene expressions patterns of the four mentioned genes in spontaneous miscarriages or fetal deaths from 38 women. Expression levels of PHLDA2 gene were upregulated in the first trimester pregnancy cases and all four imprinted genes studied were upregulated in the second trimester of pregnancy cases comparing with controls. In third trimester PEG10 was downregulated in fetal samples group. This is the first study presenting data from human imprinted genes expression in spontaneous miscarriages or fetal deaths cases from the three trimesters of pregnancy.
PEG10 as an oncogene: expression regulatory mechanisms and role in tumor progression
CANCER CELL INTERNATIONAL
Authors: Xie, Tian; Pan, Shan; Zheng, Hang; Luo, Zilv; Tembo, Kingsley M.; Jamal, Muhammad; Yu, Zhongyang; Yu, Yao; Xia, Jing; Yin, Qian; Wang, Meng; Yuan, Wen; Zhang, Qiuping; Xiong, Jie
Abstract
Cancer is a major public health problem as one of the leading causes of death worldwide. Deciphering the molecular regulation mechanisms of tumor progression can make way for tumor diagnosis and therapy. Paternally expressed gene 10 (PEG10), located on human chromosome 7q21.3, has turned out to be an oncogene implicated in the proliferation, apoptosis and metastasis of tumors. PEG10 has been found to be positively expressed in a variety of cancers with seemingly complex expression regulation mechanisms. In this review, we focus on the most vital factors influencing PEG10 expression and recapitulate some of the currently known and potential mechanisms of PEG10 affecting tumor progression, as understanding the molecular regulatory mechanisms of tumor progression can provide potential PEG10 related diagnosis and biomarker specific targeted therapies.