Molecular basis of dihydropteridine reductase deficiency.

The spectrum of mutations causing dihydropteridine reductase is reviewed. A total of 12 point mutations have been described that map in the DHPR cDNA, resulting in amino acid substitutions, insertions and premature terminations. A further two mutations are described which result in aberrant splicing of DHPR transcripts. The application of the mutation identification to diagnostics and clinical treatment is discussed.