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Klammt, Jürgen; Neumann, David; Gevers, Evelien F; Andrew, Shayne F; Schwartz, I David; Rockstroh, Denise; Colombo, Roberto; Sanchez, Marco A; Vokurkova, Doris; Kowalczyk, Julia; Metherell, Louise A; Rosenfeld, Ron G; Pfäffle, Roland; Dattani, Mehul T; Dauber, Andrew; Hwa, Vivian
Nature communications, 05/2018, Letnik: 9, Številka: 1Journal Article
Growth hormone (GH) insensitivity syndrome (GHIS) is a rare clinical condition in which production of insulin-like growth factor 1 is blunted and, consequently, postnatal growth impaired. Autosomal-recessive mutations in signal transducer and activator of transcription (STAT5B), the key signal transducer for GH, cause severe GHIS with additional characteristics of immune and, often fatal, pulmonary complications. Here we report dominant-negative, inactivating STAT5B germline mutations in patients with growth failure, eczema, and elevated IgE but without severe immune and pulmonary problems. These STAT5B missense mutants are robustly tyrosine phosphorylated upon stimulation, but are unable to nuclear localize, or fail to bind canonical STAT5B DNA response elements. Importantly, each variant retains the ability to dimerize with wild-type STAT5B, disrupting the normal transcriptional functions of wild-type STAT5B. We conclude that these STAT5B variants exert dominant-negative effects through distinct pathomechanisms, manifesting in milder clinical GHIS with general sparing of the immune system.
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