Genetic basis of alpha-aminoadipic and alpha-ketoadipic aciduria

Abstract

Alpha-aminoadipic and alpha-ketoadipic aciduria is an autosomal recessive inborn error of lysine, hydroxylysine, and tryptophan degradation. To date, DHTKD1 mutations have been reported in two alpha-aminoadipic and alpha-ketoadipic aciduria patients. We have now sequenced DHTKD1 in nine patients diagnosed with alpha-aminoadipic and alpha-ketoadipic aciduria as well as one patient with isolated alpha-aminoadipic aciduria, and identified causal mutations in eight. We report nine novel mutations, including three missense mutations, two nonsense mutations, two splice donor mutations, one duplication, and one deletion and insertion. Two missense mutations, one of which was reported before, were observed in the majority of cases. The clinical presentation of this group of patients was inhomogeneous. Our results confirm that alpha-aminoadipic and alpha-ketoadipic aciduria is caused by mutations in DHTKD1, and further establish that DHTKD1 encodes the E1 subunit of the alpha-ketoadipic acid dehydrogenase complex.

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Acknowledgments

The authors thank Prof. Udo Wendel (Düsseldorf, Germany) for enabling the investigations on patient 8, and Janet Haasjes (Amsterdam, the Netherlands) for DNA sequencing. Financial support by the Jürgen Manchot Stiftung (Düsseldorf, Germany) and by the Müller-Fahnenberg-Stiftung (Freiburg, Germany) is gratefully acknowledged.

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Correspondence to Sander M. Houten.

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Communicated by: Carla E. Hollak

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Hagen, J., te Brinke, H., Wanders, R.J.A. et al. Genetic basis of alpha-aminoadipic and alpha-ketoadipic aciduria. J Inherit Metab Dis 38, 873–879 (2015). https://doi.org/10.1007/s10545-015-9841-9

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Keywords

  • Splice Donor Site
  • Severe Intellectual Disability
  • Biochemical Phenotype
  • Biotinidase Deficiency
  • Delay Motor Development