Rxivist combines preprints from bioRxiv with data from Twitter to help you find the papers being discussed in your field. Currently indexing 70,836 bioRxiv papers from 309,140 authors.
Comprehensive population-based genome sequencing provides insight into hematopoietic regulatory mechanisms
Satish K Nandakumar,
Jacob C Ulirsch,
Seyedeh Maryam Zekavat,
Jason D. Buenrostro,
Stacey B Gabriel,
Eric S Lander,
Joel N. Hirschhorn,
Vijay G. Sankaran
Posted 04 Aug 2016
bioRxiv DOI: 10.1101/067934 (published DOI: 10.1073/pnas.1619052114)
Posted 04 Aug 2016
Genetic variants affecting hematopoiesis can influence commonly measured blood cell traits. To identify factors that affect hematopoiesis, we performed association studies for blood cell traits in the population-based Estonian Biobank using high coverage whole genome sequencing (WGS) in 2,284 samples and SNP genotyping in an additional ~17,000 samples. Our analyses identified 17 associations across 14 blood cell traits. Integration of WGS-based fine-mapping and complementary epigenomic data sets provided evidence for causal mechanisms at several loci, including at a novel basophil count-associated locus near the master hematopoietic transcription factor CEBPA. The fine-mapped variant at this basophil count association near CEBPA overlapped an enhancer active in common myeloid progenitors and influenced its activity. In situ perturbation of this enhancer by CRISPR/Cas9 mutagenesis in hematopoietic stem and progenitor cells demonstrated that it is necessary for and specifically regulates CEBPA expression during basophil differentiation. We additionally identified basophil count-associated variation at another more pleiotropic myeloid enhancer near GATA2, highlighting regulatory mechanisms for ordered expression of master hematopoietic regulators during lineage specification. Our study illustrates how population-based genetic studies can provide key insights into poorly understood cell differentiation processes of considerable physiologic relevance.
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