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Related Concept Videos

Urinary Tract Calculi I: Introduction01:28

Urinary Tract Calculi I: Introduction

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Renal calculi, or kidney stones, are solid deposits of minerals and salts formed inside the kidneys. In medical terminology, "calculus" refers to the stone itself, while "lithiasis" describes the process of stone formation. Depending on their location within the urinary system, these stones may be classified as either urolithiasis, when situated within the urinary tract, or nephrolithiasis, when located within the kidneys. Each term signifies the specific impact of the stone.Predisposition...
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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
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Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations01:26

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Renal calculi, commonly termed kidney stones, are crystalline solid masses that form in the kidneys but can occur at any point within the urinary system, encompassing the kidneys, ureters, bladder, and urethra.The pathophysiology of renal stones involves several key factors: supersaturation of the urine with stone-forming constituents, changes in urine pH, a decrease in urine volume, and the presence of substances that promote or inhibit stone formation.Supersaturation of Urine: This is the...
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Urinary Tract Calculi III: Medical Management01:30

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The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
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Mutations in SLC26A1 Cause Nephrolithiasis.

Heon Yung Gee1, Ikhyun Jun2, Daniela A Braun3

  • 1Department of Pharmacology, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul 03722, Republic of Korea; Division of Nephrology, Department of Medicine, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA.

American Journal of Human Genetics
|May 24, 2016
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Summary
This summary is machine-generated.

Mutations in the SLC26A1 gene cause a rare, inherited form of nephrolithiasis (kidney stones). This discovery identifies new genetic factors contributing to kidney stone formation and disease.

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Area of Science:

  • Genetics
  • Nephrology
  • Molecular Biology

Background:

  • Nephrolithiasis affects 5-10% of the global population, leading to substantial healthcare costs and morbidity.
  • Mutations in over 30 genes are linked to nephrolithiasis, accounting for only 15% of cases, indicating a need for further gene discovery.

Purpose of the Study:

  • To identify novel genes associated with nephrolithiasis through targeted sequencing.
  • To investigate the functional impact of identified gene mutations on kidney stone formation.

Main Methods:

  • Targeted next-generation sequencing of 18 candidate genes in 348 unrelated individuals with kidney stones.
  • Immunofluorescence, immunoblotting, glycosylation analysis, and anion exchange activity assays to characterize SLC26A1 variants.
  • Genetic analysis to identify mutations linked to calcium oxalate kidney stones.

Main Results:

  • Biallelic mutations in SLC26A1 (solute carrier family 26 member 1) were identified in two unrelated patients with calcium oxalate kidney stones.
  • Mutant SLC26A1 proteins exhibited impaired folding or trafficking and reduced anion transporter activity.
  • The identified SLC26A1 mutations were associated with a recessive Mendelian form of nephrolithiasis.

Conclusions:

  • Mutations in SLC26A1 are a newly identified cause of recessive Mendelian nephrolithiasis.
  • SLC26A1 plays a crucial role in kidney stone formation, likely through its function as an anion transporter.
  • Further research into SLC26A1 function may reveal new therapeutic targets for nephrolithiasis.