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Dynamic regulation of a ribosome rescue pathway in erythroid cells and platelets #MMPMID27681415
Mills EW; Wangen J; Green R; Ingolia NT
Cell Rep 2016[Sep]; 17 (1): 1-10 PMID27681415show ga
Protein synthesis continues in platelets and maturing reticulocytes, although these blood cells lack nuclei and do not make new mRNA or ribosomes. Here, we analyze translation in primary human cells from both anucleate lineages by ribosome profiling and uncover dramatic accumulation of post-termination, unrecycled ribosomes in the 3ŽUTRs of mRNAs. We demonstrate that these ribosomes accumulate as a result of the natural loss of the ribosome recycling factor ABCE1 during terminal differentiation. Induction of ribosome rescue factors PELO and HBS1L is required to support protein synthesis when ABCE1 levels fall. including for hemoglobin production during blood cell development. Our observations suggest that this distinctive loss of ABCE1 in anucleate blood lineages could sensitize them to defects in ribosome homeostasis, perhaps explaining in part why genetic defects in the fundamental process of ribosome production (?ribosomopathies?) often affect hematopoiesis specifically.