RAB18 deficiency
Dernière mise à jour 22 août 2023
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RAB18 deficiency causes two conditions with similar signs and symptoms that primarily affect the eyes, brain, and reproductive system. These two conditions, called Warburg micro syndrome and Martsolf syndrome, were once thought to be distinct disorders but are now considered to be part of the same disease spectrum because of their similar features and shared genetic cause.
Description
RAB18 deficiency causes two conditions with similar signs and symptoms that primarily affect the eyes, brain, and reproductive system. These two conditions, called Warburg micro syndrome and Martsolf syndrome, were once thought to be distinct disorders but are now considered to be part of the same disease spectrum because of their similar features and shared genetic cause.
Warburg micro syndrome is the more severe condition. Individuals with this condition have several eye problems from birth, including clouding of the lenses of the eyes (cataracts), abnormally small eyes (microphthalmia), and small corneas (microcornea). The lens is a structure at the front of the eye that helps focus light, and the cornea is the outer covering of the eye. In addition, the pupils of the eyes may be abnormally small (constricted), and they may not enlarge (dilate) in low light. Individuals with Warburg micro syndrome also have degeneration of the nerves that carry visual information from the eyes to the brain (optic atrophy). The eye problems impair vision in affected individuals.
People with Warburg micro syndrome have severe intellectual disability and other neurological features due to problems with growth and development of the brain. Affected individuals have delayed development and may never be able to sit, stand, walk, or speak. They usually have weak muscle tone (hypotonia) in infancy. By early childhood, they develop muscle stiffness (spasticity) and joint deformities (contractures) that restrict movement in the legs. The muscle problems worsen (progress) to include the arms and lead to paralysis of all four limbs (spastic quadriplegia). Eventually, breathing may be impaired. The brain abnormalities can contribute to vision problems (cortical visual impairment). Individuals with Warburg micro syndrome may also have recurrent seizures (epilepsy).
Some people with Warburg micro syndrome have reduced production of the hormones that direct sexual development (hypogonadotropic hypogonadism). The shortage of these hormones impairs normal development of reproductive organs. Affected males may have a small penis (micropenis) or undescended testes (cryptorchidism). Affected females may have underdeveloped internal genital folds (labia minora) or a small clitoris or vaginal opening (introitus).
Martsolf syndrome affects the same body systems as Warburg micro syndrome but is usually less severe. Individuals with Martsolf syndrome have cataracts, microphthalmia, and small pupils. They have milder optic atrophy and cortical visual impairment than people with Warburg micro syndrome. Intellectual disability is mild to moderate in people with Martsolf syndrome. While language and motor skills, such as sitting and walking, are delayed, affected individuals usually acquire them. Hypotonia is common in infants with Martsolf syndrome, although spasticity worsens more slowly than in individuals with Warburg micro syndrome, and it usually affects only the legs and feet. Hypogonadotropic hypogonadism can also occur in individuals with Martsolf syndrome.
Neither Warburg micro syndrome nor Martsolf syndrome affect the life expectancy of affected individuals.
Inheritance patterns
The source lists the following possible inheritance patterns: Autosomal recessive. More than one pattern can apply in different cases.
Related genes
Other names
Martsolf syndrome
Warburg micro syndrome
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Lectures complémentaires et références
- RAB18 deficiency; MedlinePlus, National Library of Medicine.
- Aligianis IA, Johnson CA, Gissen P, Chen D, Hampshire D, Hoffmann K, Maina EN, Morgan NV, Tee L, Morton J, Ainsworth JR, Horn D, Rosser E, Cole TR, Stolte-Dijkstra I, Fieggen K, Clayton-Smith J, Megarbane A, Shield JP, Newbury-Ecob R, Dobyns WB, Graham JM Jr, Kjaer KW, Warburg M, Bond J, Trembath RC, Harris LW, Takai Y, Mundlos S, Tannahill D, Woods CG, Maher ER. Mutations of the catalytic subunit of RAB3GAP cause Warburg Micro syndrome. Nat Genet. 2005 Mar;37(3):221-3. doi: 10.1038/ng1517.
- Aligianis IA, Morgan NV, Mione M, Johnson CA, Rosser E, Hennekam RC, Adams G, Trembath RC, Pilz DT, Stoodley N, Moore AT, Wilson S, Maher ER. Mutation in Rab3 GTPase-activating protein (RAB3GAP) noncatalytic subunit in a kindred with Martsolf syndrome. Am J Hum Genet. 2006 Apr;78(4):702-7. doi: 10.1086/502681. Epub 2006 Feb 14.
- Bem D, Yoshimura S, Nunes-Bastos R, Bond FC, Kurian MA, Rahman F, Handley MT, Hadzhiev Y, Masood I, Straatman-Iwanowska AA, Cullinane AR, McNeill A, Pasha SS, Kirby GA, Foster K, Ahmed Z, Morton JE, Williams D, Graham JM, Dobyns WB, Burglen L, Ainsworth JR, Gissen P, Muller F, Maher ER, Barr FA, Aligianis IA. Loss-of-function mutations in RAB18 cause Warburg micro syndrome. Am J Hum Genet. 2011 Apr 8;88(4):499-507. doi: 10.1016/j.ajhg.2011.03.012.
- Borck G, Wunram H, Steiert A, Volk AE, Korber F, Roters S, Herkenrath P, Wollnik B, Morris-Rosendahl DJ, Kubisch C. A homozygous RAB3GAP2 mutation causes Warburg Micro syndrome. Hum Genet. 2011 Jan;129(1):45-50. doi: 10.1007/s00439-010-0896-2. Epub 2010 Oct 22.
- Feldmann A, Bekbulat F, Huesmann H, Ulbrich S, Tatzelt J, Behl C, Kern A. The RAB GTPase RAB18 modulates macroautophagy and proteostasis. Biochem Biophys Res Commun. 2017 May 6;486(3):738-743. doi: 10.1016/j.bbrc.2017.03.112. Epub 2017 Mar 22.
- Gerondopoulos A, Bastos RN, Yoshimura S, Anderson R, Carpanini S, Aligianis I, Handley MT, Barr FA. Rab18 and a Rab18 GEF complex are required for normal ER structure. J Cell Biol. 2014 Jun 9;205(5):707-20. doi: 10.1083/jcb.201403026. Epub 2014 Jun 2.
- Handley M, Sheridan E. RAB18 Deficiency. 2018 Jan 4. In: Adam MP, Bick S, Mirzaa GM, Wallace SE, Amemiya A, editors. GeneReviews(R) [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2026. Available from http://www.ncbi.nlm.nih.gov/books/NBK475670/
- Handley MT, Carpanini SM, Mali GR, Sidjanin DJ, Aligianis IA, Jackson IJ, FitzPatrick DR. Warburg Micro syndrome is caused by RAB18 deficiency or dysregulation. Open Biol. 2015 Jun;5(6):150047. doi: 10.1098/rsob.150047.
- Liegel RP, Handley MT, Ronchetti A, Brown S, Langemeyer L, Linford A, Chang B, Morris-Rosendahl DJ, Carpanini S, Posmyk R, Harthill V, Sheridan E, Abdel-Salam GM, Terhal PA, Faravelli F, Accorsi P, Giordano L, Pinelli L, Hartmann B, Ebert AD, Barr FA, Aligianis IA, Sidjanin DJ. Loss-of-function mutations in TBC1D20 cause cataracts and male infertility in blind sterile mice and Warburg micro syndrome in humans. Am J Hum Genet. 2013 Dec 5;93(6):1001-14. doi: 10.1016/j.ajhg.2013.10.011. Epub 2013 Nov 14.
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