base insertion

base insertion

addition of an extra NUCLEOTIDE base to a DNA molecule, producing an INSERTION MUTATION that can have serious consequences for the related protein. See FRAMESHIFT.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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investigated another Pakistan family with Grebe syndrome and identified a four base insertion mutation (c.1114insGAGT) in the CDMP1 gene.