Gene expression in hybrids and heterosis


Heterosis, or hybrid vigor, refers to the phenomena in which hybrid offspring exhibits phenotypic characteristics that are superior to either parent. This genetic phenomenon has a substantial impact upon human agriculture practices and is widely used in many crop species despite a complete lack of an understanding of its molecular basis. During the course of a series of studies on allelic variation among maize lines and the prevalence of cis- and trans-regulatory variation, we gathered gene expression profiles for a series of inbred and hybrid maize lines.