Rabson-Mendenhall syndrome
Última actualización 19 Jul 2023
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Rabson-Mendenhall syndrome is a rare disorder characterised by severe insulin resistance, a condition in which the body's tissues and organs do not respond properly to the hormone insulin. Insulin normally helps regulate blood sugar levels by controlling how much sugar (in the form of glucose) is passed from the bloodstream into cells to be used as energy. In people with Rabson-Mendenhall syndrome, insulin resistance impairs blood glucose regulation and ultimately leads to a condition called diabetes mellitus, in which blood glucose levels can become dangerously high.
Descripción
Rabson-Mendenhall syndrome is a rare disorder characterised by severe insulin resistance, a condition in which the body's tissues and organs do not respond properly to the hormone insulin. Insulin normally helps regulate blood sugar levels by controlling how much sugar (in the form of glucose) is passed from the bloodstream into cells to be used as energy. In people with Rabson-Mendenhall syndrome, insulin resistance impairs blood glucose regulation and ultimately leads to a condition called diabetes mellitus, in which blood glucose levels can become dangerously high.
Severe insulin resistance in people with Rabson-Mendenhall syndrome affects the development of many parts of the body. Affected individuals are unusually small starting before birth, and infants experience failure to thrive, which means they do not grow and gain weight at the expected rate. Additional features of the condition that become apparent early in life include a lack of fatty tissue under the skin (subcutaneous fat); wasting (atrophy) of muscles; dental abnormalities; excessive body hair growth (hirsutism); multiple cysts on the ovaries in females; and enlargement of the nipples, genitalia, kidneys, heart, and other organs. Most affected individuals also have a skin condition called acanthosis nigricans, in which the skin in body folds and creases becomes thick, dark, and velvety. Distinctive facial features in people with Rabson-Mendenhall syndrome include prominent, widely spaced eyes; a broad nose; and large, low-set ears.
Rabson-Mendenhall syndrome is one of a group of related conditions described as inherited severe insulin resistance syndromes. These disorders, which also include Donohue syndrome and type A insulin resistance syndrome, are considered part of a spectrum. Rabson-Mendenhall syndrome is intermediate in severity between Donohue syndrome (which is usually fatal before age 2) and type A insulin resistance syndrome (which is often not diagnosed until adolescence). People with Rabson-Mendenhall syndrome develop signs and symptoms early in life and live into their teens or twenties. Death usually results from complications related to diabetes mellitus, such as a toxic buildup of acids called ketones in the body (diabetic ketoacidosis).
Patrones de herencia
The source lists the following possible inheritance patterns: Autosomal recessive. More than one pattern can apply in different cases.
Related genes
Otros nombres
Mendenhall syndrome
Pineal hyperplasia and diabetes mellitus syndrome
Pineal hyperplasia, insulin-resistant diabetes mellitus, and somatic abnormalities
RMS
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Lecturas adicionales y referencias
- Rabson-Mendenhall syndrome; MedlinePlus, National Library of Medicine.
- Grasso V, Colombo C, Favalli V, Galderisi A, Rabbone I, Gombos S, Bonora E, Massa O, Meschi F, Cerutti F, Iafusco D, Bonfanti R, Monciotti C, Barbetti F. Six cases with severe insulin resistance (SIR) associated with mutations of insulin receptor: Is a Bartter-like syndrome a feature of congenital SIR? Acta Diabetol. 2013 Dec;50(6):951-7. doi: 10.1007/s00592-013-0490-x. Epub 2013 Jul 4.
- Jiang S, Fang Q, Zhang F, Wan H, Zhang R, Wang C, Bao Y, Zhang L, Ma X, Lu J, Gao F, Xiang K, Jia W. Functional characterization of insulin receptor gene mutations contributing to Rabson-Mendenhall syndrome - phenotypic heterogeneity of insulin receptor gene mutations. Endocr J. 2011;58(11):931-40. doi: 10.1507/endocrj.ej11-0032. Epub 2011 Aug 23.
- Longo N, Wang Y, Smith SA, Langley SD, DiMeglio LA, Giannella-Neto D. Genotype-phenotype correlation in inherited severe insulin resistance. Hum Mol Genet. 2002 Jun 1;11(12):1465-75. doi: 10.1093/hmg/11.12.1465.
- Musso C, Cochran E, Moran SA, Skarulis MC, Oral EA, Taylor S, Gorden P. Clinical course of genetic diseases of the insulin receptor (type A and Rabson-Mendenhall syndromes): a 30-year prospective. Medicine (Baltimore). 2004 Jul;83(4):209-222. doi: 10.1097/01.md.0000133625.73570.54.
- Parker VE, Semple RK. Genetics in endocrinology: genetic forms of severe insulin resistance: what endocrinologists should know. Eur J Endocrinol. 2013 Sep 12;169(4):R71-80. doi: 10.1530/EJE-13-0327. Print 2013 Oct.
- Semple RK, Savage DB, Cochran EK, Gorden P, O'Rahilly S. Genetic syndromes of severe insulin resistance. Endocr Rev. 2011 Aug;32(4):498-514. doi: 10.1210/er.2010-0020. Epub 2011 May 2.
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