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ago rtm these genes will improve our understanding of imprint-ing and its contribution to mammalian evolution. mental evidence. For many of the genes, observations Review TRENDS in Genetics Vol.21 No.8 August 2005imprinted genes and parent-of-origin effects ’ (www.otago.many genes, the silencing is only partial. Although the literature typically represents the effects of imprinting with the use of terms such as ‘paternally expressed’, we suggest that terms such as ‘maternally suppressed’, which are being used more frequently in recent literature, are preferable because they reflect the biology of imprinting more precisely. A comprehensive list of putatively imprinted mamma-lian ‘genes ’ was derived from the published literature, which is currently summarized in the ‘Catalogue o