Paternal monoallelic expression of PEG3 in the human placenta.

Abstract:

:Genomic imprinting is the phenomenon whereby mono-allelic expression of certain genes occurs depending on their parental origin. The observation that imprinting only occurs in placental mammals has led to the suggestion that it may play a role in this form of reproduction. In the present study we have investigated the pattern of expression of the human PEG3 gene in the early to term placenta, as well as the uterus and ovary, using RT-PCR, northern blot and in situ hybridization. A comparison is made with the expression of Peg3 in the mouse by histochemical staining in betageo knock out mice. We have demonstrated high levels of PEG3 in the human placenta and have localized the signal to the layer of villous cytotrophoblast cells. In contrast, the pattern of expression of Peg3 in the mouse placenta is less restricted, the message being present in all trophoblast populations. Thus, expression of PEG3/Peg3 in the human and mouse placenta is not directly comparable. We have also detected PEG3 message in the ovarian stroma. We have sequenced the human PEG3 gene from exon 3 to exon 9. By utilizing a polymorphism detected in exon 9, we have established that only the paternal allele is expressed in human placenta. Human PEG3 is therefore maternally imprinted as in mouse.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Hiby SE,Lough M,Keverne EB,Surani MA,Loke YW,King A

doi

10.1093/hmg/10.10.1093

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

1093-100

issue

10

eissn

0964-6906

issn

1460-2083

journal_volume

10

pub_type

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