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Legius syndrome (LS) is an autosomal dominant condition characterized by cafe au lait spots. [3] It was first described in 2007 and is often mistaken for neurofibromatosis type I. It is caused by mutations in the SPRED1 gene. [5] [6] It is also known as neurofibromatosis type 1-like syndrome. [1]
Having six or more café au lait spots greater than 5 mm in diameter before puberty, or greater than 15 mm in diameter after puberty, is a diagnostic feature of neurofibromatosis type I (NF-1), but other features are required to diagnose NF-1. [2] Familial multiple cafe-au-lait spots have been observed without an NF-1 diagnosis. [9] Noonan syndrome
Café au lait spot characteristic of NF1 Diagnostic criteria of neurofibromatosis type I, requiring at least 2 of the mentioned items. [6]The following is a list of conditions and complications associated with NF-1, and, where available, age range of onset and progressive development, occurrence percentage of NF-1 population, method of earliest diagnosis, and treatments and related medical ...
Neurofibromatosis type I is the most common of the three types and is caused by genetic changes in the NF1 gene located on chromosome 17 (17q11.2). This gene encodes a cytoplasmic protein known the neurofibromin, which functions as a tumor suppressor and therefore serves as a signal regulator of cell proliferation and differentiation.
It was first discovered when Riccardi et al. described multiple families with cafe-au-lait spots and no association for neurofibromatosis in 1980. [5]In 1993, Charrow et al. described five members from a four-generation family who had the characteristic tell-tale sign of neurofibromatosis, multiple cafe au lait spots; however, testing of the gene usually involved in neurofibromatosis revealed ...
In most instances, neurofibromatosis type 1 can be diagnosed clinically according to consensus criteria and genetic testing is only used in atypical presentations or for family planning decisions. [11] Café au lait spots are one of the most characteristic features of neurofibromatosis type 1. They are hyperpigmented lesions of the skin that ...
Conditions associated with the development of café au lait macules Condition Ataxia–telangiectasia: Bloom syndrome: Fanconi anaemia: Gaucher's disease: Legius syndrome: Marfan syndrome: McCune–Albright syndrome: Multiple endocrine neoplasia type 1: Neurofibromatosis type 1: Neurofibromatosis type 1-like syndrome: Noonan syndrome: Peutz ...
Neurofibromin (NF-1) is a protein that is encoded in humans, in the NF1 gene. [5] NF1 is located on chromosome 17. [6] [7] [8] Neurofibromin, a GTPase-activating protein that negatively regulates RAS/MAPK pathway activity by accelerating the hydrolysis of Ras-bound GTP.
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