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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Craniofrontonasal syndrome is caused by mutations in a gene known as EFNB1. This gene provides instructions for making a protein called ephrin B1. This protein spans the cell membrane where it can attach (bind) to other proteins on the surface of neighboring cells. Protein binding between nearby cells helps cells stick to one another (cell adhesion) and communicate, which are important for the normal shaping (patterning) of many tissues and organs before birth.</p><p>Mutations in the EFNB1 gene result in a shortage (deficiency) of ephrin B1 protein. Most of these mutations lead to an abnormally short version of the molecule that acts as the genetic blueprint for the ephrin B1 protein. The shortened molecules are quickly broken down before protein can be made. A deficiency of ephrin B1 protein prevents cell adhesion, which disrupts normal patterning in tissues before birth, leading to the signs and symptoms of craniofrontonasal syndrome.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/craniofrontonasal-syndrome/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Craniofrontonasal syndrome?"},{"bodyHtml":"<p>In people with craniofrontonasal syndrome, the skull bones along the coronal suture, which is the growth line that goes over the head from ear to ear, closes early. These changes can result in an abnormally shaped head and distinctive facial features. The size and shape of facial structures may differ between the right and left sides of the face (facial asymmetry) in individuals with craniofrontonasal syndrome. Affected individuals may also have wide-set eyes (ocular hypertelorism), eyes that do not point in the same direction (strabismus), involuntary eye movements (nystagmus), a slit (cleft) in the tip of the nose, a wide nasal bridge, an upper lip that points outward (called a tented lip), or a cleft in the upper lip with or without a cleft in roof of the mouth (palate). Some affected individuals have brain abnormalities, such as absent or underdeveloped tissue connecting the left and right halves of the brain (agenesis or dysgenesis of the corpus callosum). However, intelligence is usually unaffected in people with this condition. Females with craniofrontonasal syndrome typically have more severe signs and symptoms than affected males, who often have hypertelorism and rarely, cleft lip.</p><p>Other common features of craniofrontonasal syndrome include extra folds of skin on the neck (webbed neck), ridged nails, unusual curving of the fingers or toes (clinodactyly), extra fingers (polydactyly) or fingers that are fused together (syndactyly), low-set breasts, a sunken chest (pectus excavatum), a spine that curves to the side (scoliosis), or narrow and sloped shoulders with reduced range of motion. People with this condition may also have eyebrows that grow together in the middle (synophrys), a widow&#x27;s peak hairline with a low hairline in the back, or wiry hair.</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/craniofrontonasal-syndrome\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"craniofrontonasal-syndrome","sourceDocuments":[{"name":"Craniofrontonasal syndrome","reviewed":"2020-01","sections":{"causes":{"fetchedAt":"2026-10-20T20:20:44.071605+00:00","label":"Causes","pageSha256":"2e546c20c6123e49bf7e9a2f4802836ed142ef0274366910f83d81078744c37a","sourceUrl":"https://medlineplus.gov/genetics/condition/craniofrontonasal-syndrome/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/craniofrontonasal-syndrome"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. 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