4.3 Article

Primary hyperoxaluria and genetic linkages: an insight into the disease burden from Pakistan

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UROLITHIASIS
卷 50, 期 4, 页码 439-445

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SPRINGER
DOI: 10.1007/s00240-022-01338-x

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Primary hyperoxaluria; Nephrocalcinosis; Mutation analysis; Pakistan

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Autosomal recessive disorders are prevalent in Pakistan, especially in regions with common consanguineous marriages. This study investigated the prevalence of monogenic causes in children with nephrocalcinosis and nephrolithiasis in Karachi, Pakistan. The findings showed that the mutations observed in Pakistani patients are different and more severe than those reported in developed countries. This disease poses a major burden in developing countries, where the only treatment option of combined liver-kidney transplantation is not available.
Autosomal recessive disorders are prevalent in Pakistan, a developing South Asian country where consanguineous marriages are common. This study seeks to determine the prevalence of monogenic causes in children presenting with nephrocalcinosis and nephrolithiasis at a dialysis and transplant center in Karachi, Pakistan. A retrospective analysis was conducted in children aged 1-18 years presenting with nephrocalcinosis, between 2010 and 2019. Demographic information, clinical profile, laboratory parameters and stone analysis were collected, on a pre-designed questionnaire. One hundred and twenty-six children were included, with 11 and 3 diagnosed with renal tubular acidosis and Bartter's syndrome respectively. Next-generation sequencing and Sanger sequencing was performed on 112 children. Eighty-seven patients were diagnosed with primary hyperoxaluria, with mutations in alanine-glyoxylate-aminotransferase gene found in 73, followed by glyoxylate reductase/hydroxy-pyruvate reductase in 13, and 4-hydroxy-2-oxaloglutarate aldolase in 1. Twenty-five patients reported negative for mutations. Sixty-four percent were males, with a statistically significant difference (p < 0.05). History of parental consanguineous marriage was found in 98% of the cohort. Fifty-four and 40 patients presented to the clinic with Chronic Kidney Disease Stage 1 and Stage 5, respectively, with a statistically significant difference p = 0.007. Mutations noted in our cohort are different and more severe than those reported in the developed world. The disease poses a major disease burden in developing world context with the only treatment option of combined liver-kidney transplantation not available in Pakistan.

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