Summary
Propionic acidaemia (PA) is an autosomal recessive disease that results from deficiency of propionyl-CoA carboxylase (PCC). In the majority of reported cases, the phenotype includes metabolic acidosis and/or neurological deficits. We report on a 14-year-old Asian-American male with PA who presented with isolated cardiomyopathy without any documented episodes of metabolic acidosis or evidence of any neurocognitive deficits. On routine metabolic screening, the patient was found to have urine organic acids suggestive of PA. Biochemical and genetic characterization confirmed a PCC deficiency with two novel mutations in PCCB: IVS7 + 2 T > G (c.763 + 2 T > G) and p.R410Q (c.1229 G > A). Residual enzyme activity likely explains our patient’s mild phenotype. Splicing mutations tend to result in a milder phenotype as these mutations may still produce small amounts of normal enzyme. In addition, the similar p.R410W mutation has been shown to have partial residual activity. Moreover, this case illustrates that a thorough metabolic evaluation should be performed in both paediatric and adult patients with cardiomyopathy. Such an evaluation has important implications for clinical management and genetic counselling.
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Abbreviations
- PA:
-
propionic acidaemia
- PCC:
-
propionyl-CoA carboxylase
References
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Acknowledgements
The authors wish to thank their colleagues in the Division of Pediatric Cardiology at the Morgan Stanley Children’s Hospital of New York-Presbyterian and Columbia University Medical Center for their help and assistance, the patient and his family, and the Children’s Cardiomyopathy Foundation, John M. Driscoll, Jr, Children’s Research Fund, and Training grant T32-HL076116-05 for generous financial support. We thank Dr David Solowiejczyk for assistance with echocardiography, Dr Charles Marboe for assistance with pathology, Josue Martinez for assistance with the figures, and Patricia Lanzano for assistance with study coordination.
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Communicating editor: Mattias Baumgartner
Competing interests: None declared
References to electronic databases: Propionic acidaemia: OMIM #606054. Propionyl-CoA carboxylase: EC 6.4.1.3. HUGO-approved gene symbol: PCCA and PCCB.
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Lee, T.M., Addonizio, L.J., Barshop, B.A. et al. Unusual presentation of propionic acidaemia as isolated cardiomyopathy. J Inherit Metab Dis 32 (Suppl 1), 97–101 (2009). https://doi.org/10.1007/s10545-009-1084-1
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DOI: https://doi.org/10.1007/s10545-009-1084-1