Turkish Archives of Pediatrics
Original Article

Molecular Aspects of Distal Kidney Tubular Acidosis in Children, Its Long-Term Outcome, and Relationship with Hyperammonemia

1.

Division of Pediatric Nephrology, Department of Pediatrics, Marmara University Medical Faculty, İstanbul, Turkey

2.

Department of Medical Genetics, Marmara University Medical Faculty, İstanbul, Turkey

3.

Division of Pediatric Metabolic Disorders and Nutrition, Department of Pediatrics, Marmara University Medical Faculty, İstanbul, Turkey

Turk Arch Pediatr 2022; 57: 432-440
DOI: 10.5152/TurkArchPediatr.2022.21362
Read: 275 Downloads: 75 Published: 01 July 2022

Objective: We aimed to present the characteristics, genetic analysis results, long-term progno- sis of our patients with distal kidney tubular acidosis, and the relationship between hyperam- monemia and distal kidney tubular acidosis.

Materials and Methods: Biochemical, clinical, and imaging findings were collected at presen- tation and the last clinic visit, and results of the genetic analysis were recorded.

Results: Our study included 9 patients (3 female, 33%). The median age at diagnosis was 3 months, and the median follow-up period was 111 months. Height standard deviation scores were less than −2 in 4 (44%) patients at presentation and in 3 (33%) at the last clinic visit. The median estimated glomerular filtration rate was 98 mL/min/1.73 m2 at presentation and 126 mL/min/1.73 m2 at the last clinic visit. We have found 8 different types of mutations of 2 genes, including 6 in the ATP6V0A4 gene, 2 in the SLCA4A1 gene, and 2 of them were novel. At the time of presentation, nephrocalcinosis and hypercalciuria were present in all our patients, but at the last visit, only 1 patient had hypercalciuria. Sensorineural hearing loss was found in 4 of our patients with a mutation in the ATP6V0A4 gene. Serum ammonia levels were found to be high in 3 patients with mutations in the ATP6V0A4 gene.

Conclusion: Adequate metabolic control is essential for optimal growth and preserved kidney function in distal kidney tubular acidosis patients. Distal kidney tubular acidosis may be associ- ated with hyperammonemia. We recommend keeping potassium levels at high-normal levels to reduce ammonia levels, especially in the absence of acidosis.

Cite this article as: Güven S, Gökçe İ, Alavanda C, et al. Molecular aspects of distal kidney tubular acidosis in children, its long-term outcome, and relationship with hyperammonemia. Turk Arch Pediatr. 2022;57(4):432-440.

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