Growth hormone deficiency causes: Difference between revisions
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==== '''[[Laron syndrome]]''' ==== | ==== '''[[Laron syndrome]]''' ==== | ||
* It is the most common known cause of genetically-mediated GHI. | * It is the most common known cause of genetically-mediated GHI. | ||
* Growth hormone insensitivity is an absence of the biological effects of growth hormone despite a normal production of GH. | * [[Growth hormone insensitivity syndrome|Growth hormone insensitivity]] is an absence of the biological effects of growth hormone despite a normal production of [[Growth hormone|GH]]. | ||
* In contrast with GH deficiency, Laron syndrome is characterized by growth failure and normal levels of GH. | * In contrast with GH deficiency, [[Laron syndrome]] is characterized by growth failure and normal levels of GH. | ||
* It is caused by | * It is caused by mutations in the growth hormone (GH) receptor gene which affects the extracellular GH-binding of the receptor. | ||
* Its severity correlates to IGF-I and insulin-like growth factor-binding | * Its severity correlates to [[IGF-I]] and [[Insulin-like growth factor-binding protein 1|insulin-like growth factor-binding protein]] 3 ([[IGFBP-3]]) levels. | ||
== References == | == References == | ||
<references /> | <references /> | ||
Revision as of 19:54, 14 August 2017
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
Causes of growth hormone deficiency could be congenital or acquired. Congenital causes include genetic mutations in POU1F1, PROP-1, and GH-1 genes. Structural causes can cause growth hormone deficiency such as optic nerve hypoplasia, agenesis of corpus callosum, septo-optic dysplasia, empty sella syndrome, and holoprosencephaly. Acquired causes can cause growth hormone deficiency such as GHD following brain surgery and radiation therapy for brain tumors, central nervous system infection, craniopharyngioma, pituitary adenoma.
Causes
Congenital growth hormone deficiency:
Genetic causes
It is usually recognized by the presence of affected relatives and confirmed by molecular testing for the causative genes, which include POU1F1, PROP-1, and GH-1:
- The POU1F1 gene is responsible for pituitary-specific transcription of genes for GH, prolactin, thyrotropin, and the growth hormone releasing hormone (GHRH) receptor. PROP1 mutations result in failure to activate POU1F1/Pit1 gene expression and probably cause pituitary hypoplasia and familial multiple pituitary hormone deficiencies.
- Mutations of GH1 which is the gene encoding GH.
- Gene deletions, frameshift mutations, and nonsense mutations of GH1 have been described as causes of familial GHD.
Structural causes
- GHD is highly likely to be permanent in these patients
- It is associated with midline craniofacial anomalies causing agenesis of the hypothalamic-pituitary stalk:
- Optic nerve hypoplasia
- Midline facial defects
- Agenesis of corpus callosum
- Arachnoid cyst
- Holoprosencephaly
- Septo-optic dysplasia
- Encephalocele
- Empty sella syndrome
- Hydrocephalus
Acquired growth hormone deficiency[1]
- GHD following brain surgery and radiation therapy for brain tumors. Permanent GHD is highly likely to be permanent in infants or young children.
- Central nervous system infection
- Pituitary adenoma
- Craniopharyngioma
- Rathke’s cleft cyst
- Glioma/astrocytoma
- Germinoma
- Infiltrative/granulomatous disease:
- Langerhans cell histiocytosis
- Sarcoidosis
- Tuberculosis
- Hypophysitis
- Surgery of the pituitary or hypothalamus
- Infarction
- Sheehan’s syndrome
- Idiopathic
Laron syndrome
- It is the most common known cause of genetically-mediated GHI.
- Growth hormone insensitivity is an absence of the biological effects of growth hormone despite a normal production of GH.
- In contrast with GH deficiency, Laron syndrome is characterized by growth failure and normal levels of GH.
- It is caused by mutations in the growth hormone (GH) receptor gene which affects the extracellular GH-binding of the receptor.
- Its severity correlates to IGF-I and insulin-like growth factor-binding protein 3 (IGFBP-3) levels.