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SLC4A1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

SLC4A1 gene

The SLC4A1 gene provides instructions for the AE1 protein, which is vital for maintaining acid-base balance in the kidneys and maintaining the structural integrity of red blood cells.

Normal Function

The SLC4A1 gene provides instructions for making a protein known as anion exchanger 1 (AE1). This protein transports negatively charged atoms (anions) across cell membranes, specifically exchanging chloride ions for bicarbonate ions to maintain correct acid levels (pH) in the body.

There are two versions of the AE1 protein:

  • Kidney version: Found in alpha-intercalated cells of the renal tubules, this version allows the release of acid into the urine.
  • Red blood cell version: A longer version that attaches to the cytoskeleton of red blood cells to maintain their structure. It interacts with glycophorin A to ensure proper trafficking to the cell membrane.

Health Conditions Related to Genetic Changes

SLC4A1-associated distal renal tubular acidosis

Mutations in the SLC4A1 gene can cause distal renal tubular acidosis, leading to the buildup of acid in the blood (metabolic acidosis). These mutations result in altered AE1 proteins that are either stuck inside the cell or trafficked to the wrong side of the cell. This disrupts bicarbonate exchange, preventing acid release into the urine. Consequences include soft, weak bones, calcium deposits in the kidneys, and kidney stones. While some affected individuals may experience hemolytic anemia if the AE1 protein is not properly trafficked in red blood cells, many do not have blood cell abnormalities due to the protective role of glycophorin A.

Hereditary spherocytosis

Mutations in the SLC4A1 gene can cause hereditary spherocytosis, an autosomal dominant disorder. A reduction of AE1 protein leads to red blood cells that are spherical and fragile, causing them to break down prematurely (hemolytic anemia). Symptoms include jaundice, gallstones, and an enlarged spleen (splenomegaly).

Other disorders

  • Hereditary stomatocytosis: Caused by an abnormal AE1 protein that allows sodium and potassium to leak out of red blood cells, leading to instability and hemolytic anemia.
  • Southeast Asian ovalocytosis: Caused by a specific deletion of nine amino acids in the AE1 protein. This results in rigid, oval-shaped red blood cells. While this mutation protects against severe malaria, having the mutation in both copies of the gene is likely lethal before birth.

Other Names for This Gene

  • AE1
  • anion exchange protein 1
  • anion exchanger 1
  • anion exchanger-1
  • band 3 anion transport protein
  • BND3
  • CD233
  • DI
  • Diego blood group
  • EMPB3
  • EPB3
  • erythrocyte membrane protein band 3
  • erythroid anion exchange protein
  • FR
  • Froese blood group
  • RTA1A
  • solute carrier family 4 (anion exchanger), member 1 (Diego blood group)
  • solute carrier family 4, anion exchanger, member 1 (erythrocyte membrane protein band 3, Diego blood group)
  • solute carrier family 4, anion exchanger, number 1
  • SW
  • Swann blood group
  • Waldner blood group
  • WD
  • WD1
  • WR
  • Wright blood group

Genomic Location

The SLC4A1 gene is found on chromosome 17.

Frequently Asked Questions

Bone health can be improved by ensuring adequate calcium and vitamin D intake, engaging in weight‑bearing exercise, and taking prescribed alkali therapy (e.g., sodium bicarbonate) to correct acidosis. Regular bone density scans (DEXA) every 1–2 years help monitor bone strength and guide adjustments to treatment.
Yes, certain mutations impair AE1 trafficking in red blood cells, leading to hemolytic anemia. Diagnosis involves a complete blood count showing low hemoglobin and high reticulocyte count, a peripheral smear revealing spherocytes, and a Coombs‑negative hemolysis panel. A definitive diagnosis is confirmed by SLC4A1 sequencing.
Hereditary spherocytosis from SLC4A1 is autosomal dominant, meaning a 50% chance of passing the mutation to each child. Genetic counseling and prenatal testing (e.g., chorionic villus sampling or amniocentesis) can identify carriers early, allowing informed reproductive decisions.
Common early signs include failure to thrive, poor growth, frequent kidney stones, and bone pain or fractures that appear before the age of 10. Parents should watch for persistent metabolic acidosis symptoms such as fatigue, muscle weakness, and a sour or metallic taste in the mouth. If these occur, a pediatric nephrologist can order blood tests for bicarbonate and urine pH, followed by genetic testing for SLC4A1 mutations.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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