An erythroid-specific ATP2B4 enhancer mediates red blood cell hydration and malaria susceptibility

Samuel Lessard, Emily Stern Gatof, Mélissa Beaudoin, Patrick G. Schupp, Falak Sher, Sukhpal Prehar, Syed Adnan Ali, Ryo Kurita, Yukio Nakamura, Esther Baena Chaparro, Jonathan Ledoux, Delvac Oceandy, Daniel Bauer, Guillaume Lettre

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Abstract

The lack of mechanistic explanations for many genotype-phenotype associations identified by GWAS precludes thorough assessment of their impact on human health. Here, we conducted an expression quantitative trait locus (eQTL) mapping analysis in erythroblasts and found erythroid-specific eQTLs for ATP2B4, the main calcium ATPase of red blood cells (rbc). The same SNPs were previously associated with mean corpuscular hemoglobin concentration (MCHC) and susceptibility to severe malaria infection. We showed that Atp2b4–/– mice demonstrate increased MCHC, confirming ATP2B4 as the causal gene at this GWAS locus. Using CRISPR-Cas9, we fine mapped the genetic signal to an erythroid-specific enhancer of ATP2B4. Erythroid cells with a deletion of the ATP2B4 enhancer had abnormally high intracellular calcium levels. These results illustrate the power of combined transcriptomic, epigenomic, and genome-editing approaches in characterizing noncoding regulatory elements in phenotype-relevant cells. Our study supports ATP2B4 as a potential target for modulating rbc hydration in erythroid disorders and malaria infection.
Original languageEnglish
Pages (from-to)3065-3074
Number of pages10
JournalJournal of Clinical Investigation
Volume127
Issue number8
Early online date17 Jul 2017
DOIs
Publication statusPublished - 1 Aug 2017

Research Beacons, Institutes and Platforms

  • Manchester Cancer Research Centre

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