Abstract
When a child is not following the normal, predicted growth curve, an evaluation for underlying illnesses and central nervous system abnormalities is required, and appropriate consideration should be given to genetic defects causing growth hormone (GH) deficiency (GHD). Because Insulin−like Growth Factor−I (IGF−I) plays a pivotal role, GHD could also be considered as a form of IGF−I deficiency (IGFD). Although IGFD can develop at any level of the GH−releasing hormone (GHRH)−GH−IGF axis, a differentiation should be made between GHD (absent to low GH in circulation) and IGFD (normal to high GH in circulation). The main focus of this review is on the GH gene, the various gene alterations and their possible impact on the pituitary gland. However, although transcription factors regulating the pituitary gland development may cause multiple pituitary hormone deficiency, they may present initially as GHD.Conflict of interest:None declared.
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