Arquivos Brasileiros de Endocrinologia & Metabologia
On-line version ISSN 1677-9487
LEAL, Andréa de Castro et al. Mutations in insulin-like growth factor receptor 1 gene (IGF1R) resulting in intrauterine and postnatal growth retardation. Arq Bras Endocrinol Metab [online]. 2011, vol.55, n.8, pp.541-549. ISSN 1677-9487. http://dx.doi.org/10.1590/S0004-27302011000800007.
Approximately 10% of children born small-for-gestational age (SGA) do not show spontaneous growth catch-up. The causes of this deficit in prenatal growth and its maintenance after birth are not completely known, in most cases. Over the past eight years, several heterozygous inactivating mutations and deletions in IGF1R gene have been reported, indicating the role of defects in the IGFs/IGF1R axis as a cause of growth deficit. It has been hypothesized that at least 2.5% of children born SGA may have IGF1R gene defects. The clinical presentation of these patients is highly variable in the severity of growth retardation and hormonal parameters. In the most evident cases, patients have microcephaly, mild cognitive impairment and high levels of IGF-1, associated with short stature of prenatal onset. This review will describe the clinical, molecular and treatment of short stature with hrGH of children with mutations in the IGF1R gene.
Keywords : Insulin-like growth factor I; receptor, IGF type 1; mutation; fetal growth retardation; growth disorders.