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Functional Selectivity in Cytokine Signaling Revealed Through a Pathogenic EPO Mutation.

Cell | 2017

Cytokines are classically thought to stimulate downstream signaling pathways through monotonic activation of receptors. We describe a severe anemia resulting from a homozygous mutation (R150Q) in the cytokine erythropoietin (EPO). Surprisingly, the EPO R150Q mutant shows only a mild reduction in affinity for its receptor but has altered binding kinetics. The EPO mutant is less effective at stimulating erythroid cell proliferation and differentiation, even at maximally potent concentrations. While the EPO mutant can stimulate effectors such as STAT5 to a similar extent as the wild-type ligand, there is reduced JAK2-mediated phosphorylation of select downstream targets. This impairment in downstream signaling mechanistically arises from altered receptor dimerization dynamics due to extracellular binding changes. These results demonstrate how variation in a single cytokine can lead to biased downstream signaling and can thereby cause human disease. Moreover, we have defined a distinct treatable form of anemia through mutation identification and functional studies.

Pubmed ID: 28283061 RIS Download

Additional research tools detected in this publication

Associated grants

  • Agency: NHLBI NIH HHS, United States
    Id: R01 HL107558
  • Agency: NHGRI NIH HHS, United States
    Id: U54 HG003067
  • Agency: NHLBI NIH HHS, United States
    Id: K02 HL111156
  • Agency: NIAID NIH HHS, United States
    Id: R37 AI051321
  • Agency: NHLBI NIH HHS, United States
    Id: R33 HL120791
  • Agency: NIDDK NIH HHS, United States
    Id: R01 DK103794

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