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Deficiency of alpha-ketoglutarate dehydrogenase — Clinical Guidelines

Overview

Deficiency of alpha-ketoglutarate dehydrogenase (AKGDH) is not directly addressed in the provided abstracts. However, the context provided revolves around phenylketonuria (PKU), an autosomal recessive disorder caused by deficiency of phenylalanine hydroxylase, leading to elevated phenylalanine levels and potential severe intellectual disability, epilepsy, and behavioral issues if untreated 1 14.

Diagnosis

Elevated blood phenylalanine levels 1 14.

Genetic testing for mutations in the PAH gene 1 14.

Clinical evaluation for intellectual disability, seizures, and behavioral problems 1 14.

Management

Strict low-phenylalanine diet supplemented with protein substitutes 2 3 6 10 11.

Regular monitoring of blood phenylalanine levels 2 3 6 10.

Micronutrient supplementation, particularly vitamins and minerals, due to increased risk of deficiencies 6 10 11.

Tetrahydrobiopterin (BH4) therapy for BH4-responsive PKU to potentially allow higher phenylalanine tolerance 7.

Special Populations

Pregnancy: Women with PKU require meticulous dietary control to prevent maternal PKU syndrome; prenatal care should include close monitoring of phenylalanine levels 17.

Pediatrics: Early diagnosis and intervention are crucial to prevent cognitive impairment; long-term nutritional support is essential to avoid malnutrition 3 6 10.

Comorbidities: Potential association between PKU and peptic ulceration requires monitoring for gastrointestinal symptoms 18.

Key Recommendations

Implement a strict low-phenylalanine diet supplemented with protein substitutes from early diagnosis to prevent intellectual disability and other complications (Evidence: Strong 2 3).

Regularly monitor blood phenylalanine levels and adjust dietary management accordingly (Evidence: Strong 2 6).

Provide comprehensive micronutrient supplementation to address deficiencies associated with a restricted diet (Evidence: Moderate 6 10).

Consider tetrahydrobiopterin (BH4) therapy in patients who respond to it to potentially allow higher phenylalanine tolerance while maintaining safety (Evidence: Moderate 7).

Pregnant women with PKU must maintain strict dietary control and receive specialized prenatal care to prevent maternal PKU syndrome (Evidence: Moderate 17).

References

1 van Wegberg AMJ, MacDonald A, Ahring K, Bélanger-Quintana A, Beblo S, Blau N et al.. European guidelines on diagnosis and treatment of phenylketonuria: First revision. Molecular genetics and metabolism 2025. link 2 Venegas E, Langeveld S, Ahring K, Benitez R, Desloovere A, Dios E et al.. Nutrient Status and Intakes of Adults with Phenylketonuria. Nutrients 2024. link 3 Weng HL, Yang FJ, Chen PR, Hwu WL, Lee NC, Chien YH. Dietary intake and nutritional status of patients with phenylketonuria in Taiwan. Scientific reports 2020. link 4 . Management of Women With Phenylalanine Hydroxylase Deficiency (Phenylketonuria): ACOG Committee Opinion, Number 802. Obstetrics and gynecology 2020. link 5 . Management of Women With Phenylalanine Hydroxylase Deficiency (Phenylketonuria): ACOG Committee Opinion Summary, Number 802. Obstetrics and gynecology 2020. link 6 Kose E, Arslan N. Vitamin/mineral and micronutrient status in patients with classical phenylketonuria. Clinical nutrition (Edinburgh, Scotland) 2019. link 7 Brantley KD, Douglas TD, Singh RH. One-year follow-up of B vitamin and Iron status in patients with phenylketonuria provided tetrahydrobiopterin (BH4). Orphanet journal of rare diseases 2018. link 8 Inglis J. HOPE FOR PKU. FUTURE. Australian nursing & midwifery journal 2016. link 9 Crujeiras V, Aldámiz-Echevarría L, Dalmau J, Vitoria I, Andrade F, Roca I et al.. Vitamin and mineral status in patients with hyperphenylalaninemia. Molecular genetics and metabolism 2015. link 10 Robert M, Rocha JC, van Rijn M, Ahring K, Bélanger-Quintana A, MacDonald A et al.. Micronutrient status in phenylketonuria. Molecular genetics and metabolism 2013. link 11 Lammardo AM, Robert M, Rocha JC, van Rijn M, Ahring K, Bélanger-Quintana A et al.. Main issues in micronutrient supplementation in phenylketonuria. Molecular genetics and metabolism 2013. link 12 Vela-Amieva M, Ibarra-González I, Fernández-Lainez C, Monroy-Santoyo S, Guillén-López S, Belmont-Martínez L et al.. Causes of delay in referral of patients with phenylketonuria to a specialized reference centre in Mexico. Journal of medical screening 2011. link 13 Gokmen T, Oguz SS, Altug N, Akar M, Erdeve O, Dilmen U. A case of maternal phenylketonuria syndrome presenting with unilateral renal agenesis. Journal of tropical pediatrics 2011. link 14 van Spronsen FJ. Phenylketonuria: a 21st century perspective. Nature reviews. Endocrinology 2010. link 15 Chestkov VV, Laptev AV, Shishkin SS. Membrane-bound phenylalanine hydroxylase of human liver. Journal of hepatology 1992. link80088-1) 16 Petruschka L, Rebrin I, Grimm U, Herrmann FH. The immunological evidence for a phenylalanine hydroxylase like immunoreactive protein in different human cells and tissues. Clinica chimica acta; international journal of clinical chemistry 1990. link90008-g) 17 Luder AS, Greene CL. Maternal phenylketonuria and hyperphenylalaninemia: implications for medical practice in the United States. American journal of obstetrics and gynecology 1989. link90642-x) 18 Greeves LG, Carson DJ, Dodge JA. Peptic ulceration and phenylketonuria: a possible link?. Gut 1988. link 19 Vogel F. Phenotypic deviations in heterozygotes of phenylketonuria (PKU). Progress in clinical and biological research 1985. link

Deficiency of alpha-ketoglutarate dehydrogenase