Genomic imprinting refers to a recently discovered phenomenon in
which the expression pattern of an allele depends on whether that
allele was inherited from the mother or the father. This difference
in expression strategy correlates with differences in the
epigenetic state of the two alleles. These epigenetic differences
include DNA methylation at CpG dinucleotides, as well as
modifications on the histones associated with the locus. In the
simplest possible cases, the promoter region of the imprinted gene
is methylated during oogenesis, but not spermatogenesis (or vice
versa). This methylation (and its accompanying histone
modifications) results in inactivation of the modified allele. Of
course, most imprinted genes do not fall into this simplest case.
The goal of this book is neither to provide a basic introduction to
imprinting, nor to provide a comprehensive survey of the current
state of the field (which would necessarily span multiple books).
Rather, the book covers on some of the more recent advances, with
the goal of drawing attention to some of the emerging subtleties
and complexities associated with imprinted genes.
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