Development, Vol 120, Issue 10 2933-2943, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

Developmental control of allelic methylation in the imprinted mouse Igf2 and H19 genes

R Feil, J Walter, ND Allen and W Reik
Laboratory of Developmental Genetics and Imprinting, Babraham Institute, Cambridge, UK.

The Insulin-like growth factor 2 (Igf2) and H19 genes are reciprocally imprinted and closely linked. Igf2 encodes a fetal growth-factor and is predominantly expressed from the paternal allele, while H19 is expressed from the maternal allele and encodes a transcript which may downregulate cellular proliferation. One of the epigenetic modifications thought to be involved in parental imprinting is DNA methylation. Here we analyse methylation in two regions of the Igf2 gene, one approx. 3 kb upstream of the gene and one in the 3' part of the gene. Both regions are more methylated on the expressed paternal chromosome. Genomic sequencing of individual chromosomes in the first region shows this parent-specific methylation to be highly mosaic; interestingly, individual sperm chromosomes carry different methylation patterns into the egg. In the more 3' region, which is fully methylated in sperm, the level of methylation on the paternal allele is highly tissue-specific and is correlated with expression of the gene in fetal tissues. Hence, the paternal allele is highly methylated in fetal liver (high expression) but is undermethylated in fetal brain (virtually no expression). Adult choroid plexus, a brain tissue in which Igf2 is expressed from both alleles and H19 is not expressed, represents an apparent loss of imprinting. Here, both Igf2 and H19 adopt a paternal type methylation pattern on both parental chromosomes. Analysis of early-passage androgenetic and parthenogenetic embryonic stem (ES) cells shows that the methylation patterns of Igf2 and H19 on maternal and paternal chromosomes are very similar. Androgenetic and parthenogenetic teratomas derived from these ES cells show the appropriate paternal and maternal patterns, respectively, of allelic methylation in both genes. Our results suggest that allelic methylation patterns in Igf2 and H19 arise early in embryogenesis and change progressively during development. Some of these developmental changes are apparently under tissue-specific control.

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