HYMAI (hydatidiform mole associated and imprinted) is a non-coding RNA transcript that is expressed
only from the paternal chromosome. It overlaps exon 1 of the imprinted gene PLAGL1 (ZAC) and shares
the same DMR (Arima
T et al, 2000; Arima
T et al, 2001). Imprinting is also supported by expression studies in monochromosomal hybrids (Inoue
J et al, 2001).