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complementary gene

British  

noun

  1. one of a pair of genes, each from different loci, that together are required for the expression of a certain characteristic

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Balazs and other researchers are working on ‘off switches’ in the form of complementary gene therapies or drugs.

From Nature