Transcription from alternative DNA strands

Not all coding regions are on the same strand of DNA. In this diagram, Gene 1 is transcribed for the "lower" strand, from "right to left," and Gene 2 is transcribed from the "upper" strand, from "left to right."  In both cases, the RNA transcript is synthesized in the 5'3' direction.

Figure ©2002 by Griffiths et al.; All text material © 2007 by Steven M. Carr