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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Congenital leptin deficiency is caused by mutations in the LEP gene. This gene provides instructions for making a hormone called leptin, which is involved in the regulation of body weight. Normally, the body&#x27;s fat cells release leptin in proportion to their size. As fat accumulates in cells, more leptin is produced. This rise in leptin indicates that fat stores are increasing.</p><p>Leptin attaches (binds) to and activates a protein called the leptin receptor, fitting into the receptor like a key into a lock. The leptin receptor protein is found on the surface of cells in many organs and tissues of the body including a part of the brain called the hypothalamus. The hypothalamus controls hunger and thirst as well as other functions such as sleep, moods, and body temperature. It also regulates the release of many hormones that have functions throughout the body. In the hypothalamus, the binding of leptin to its receptor triggers a series of chemical signals that affect hunger and help produce a feeling of fullness (satiety).</p><p>LEP gene mutations that cause congenital leptin deficiency lead to an absence of leptin. As a result, the signaling that triggers feelings of satiety does not occur, leading to the excessive hunger and weight gain associated with this disorder. Because hypogonadotropic hypogonadism occurs in congenital leptin deficiency, researchers suggest that leptin signaling is also involved in regulating the hormones that control sexual development. However, the specifics of this involvement and how it may be altered in congenital leptin deficiency are unknown.</p><p>Congenital leptin deficiency is a rare cause of obesity. Researchers are studying the factors involved in more common forms of obesity.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Congenital leptin deficiency?"},{"bodyHtml":"<p>People with congenital leptin deficiency also have hypogonadotropic hypogonadism, which is a condition caused by reduced production of hormones that direct sexual development. Without treatment, affected individuals experience delayed puberty or do not go through puberty, and may be unable to conceive children (infertile).</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"congenital-leptin-deficiency","sourceDocuments":[{"name":"Congenital leptin deficiency","reviewed":"2013-12","sections":{"causes":{"fetchedAt":"2026-10-20T20:20:38.046771+00:00","label":"Causes","pageSha256":"80ec548149f5834b4814dbb066541537c4e918f8a3d8f51ede1ebbab0a567e5d","sourceUrl":"https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. 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