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Cytoplasmic incompatibility induced by inherited intracellular bacteria of arthropods, and  Medea  elements found in flour beetles, are both forms of postsegregation distortion involving the killing of embryos in order to increase the ratio of progeny that inherit them. The recently described  peel-zeel  element of  Caenorhabditis elegans  also uses this mechanism; like  Medea  the genes responsible are in the nuclear genome but it shares a paternal mode of action with the bacteria. The  peel-1  gene has now been shown to encode a potent toxin that is delivered by sperm, and rescued by zygotic transcription of the linked  zeel-1 . The predominance of self-fertilization in  C. elegans  has produced an unusual distribution pattern for a selfish genetic element; further population and functional studies will shed light on its evolution. The element might also have potential for use in disease control.

Invertebrate Post-Segregation Distorters: A New Embryo-Killing Gene