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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>MCKD1 is caused by mutations in the MUC1 gene. This gene provides instructions for making a protein called mucin 1, which is one of several mucin proteins that make up mucus. Mucus is a slippery substance that lubricates the lining of the airways, digestive system, reproductive system, and other organs and tissues and protects them from foreign invaders and other particles.</p><p>In addition to its role in mucus, mucin 1 relays signals from outside the cell to the cell&#x27;s nucleus. Through this cellular signaling, mucin 1 is thought to be involved in the growth, movement, and survival of cells. Research suggests that mucin 1 plays a role in the normal development of the kidneys.</p><p>MCKD1 is caused by the insertion of a single DNA building block (nucleotide) called cytosine into the MUC1 gene. These mutations have been found in one particular region of the gene. They lead to the production of an altered protein. It is unclear how this change causes kidney disease.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/medullary-cystic-kidney-disease-type-1/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Medullary cystic kidney disease type 1?"},{"bodyHtml":"<p>Declining kidney function in people with MCKD1 leads to the signs and symptoms of the condition. The features are variable, even among members of the same family. Many individuals with MCKD1 develop high blood pressure (hypertension), especially as kidney function worsens. Some develop high levels of a waste product called uric acid in the blood (hyperuricemia) because the damaged kidneys are unable to remove uric acid effectively. In a small number of affected individuals, the buildup of this waste product can cause gout, which is a form of arthritis resulting from uric acid crystals in the joints.</p><p>Although the condition is named medullary cystic kidney disease, only about 40 percent of affected individuals have medullary cysts, which are fluid filled pockets found in a particular region of the kidney. When present, the cysts are usually found in the inner part of the kidney (the medullary region) or the border between the inner and outer parts (corticomedullary region). These cysts are visible by tests such as ultrasound or CT scan.</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/medullary-cystic-kidney-disease-type-1\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"medullary-cystic-kidney-disease-type-1","sourceDocuments":[{"name":"Medullary cystic kidney disease type 1","reviewed":"2013-06","sections":{"causes":{"fetchedAt":"2026-10-20T20:23:11.483864+00:00","label":"Causes","pageSha256":"1042b88407e601615703db976c061c2be0e273222c1f21c4702519d16cb75ee0","sourceUrl":"https://medlineplus.gov/genetics/condition/medullary-cystic-kidney-disease-type-1/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/medullary-cystic-kidney-disease-type-1"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Medullary cystic kidney disease type 1"},"schemaVersion":1}