Identification of rs11615992 as a novel regulatory SNP for human P2RX7 by allele-specific expression
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P2RX7 (purinergic receptor P2X 7) is an important membrane ion channel and involved in multiple physiological processes. One non-synonymous SNP on P2RX7, rs3751143, had been proven to reduce ion channel function and further associated with multiple diseases. However, it was still unclear whether there were other cis-regulatory elements for P2RX7, which might further contribute to related diseases. Allele-specific expression (ASE) is a robust and sensitive approach to identify the potential functional region in human genome. In the current study, we measured ASE on rs3751143 in lung tissues and observed a consistent excess of A allele over C (P = 0.001), which indicated that SNP(s) in linkage disequilibrium (LD) could regulate P2RX7 expression. By analyzing the 1000 genomes project data for Chinese, one SNP locating ~ 5 kb away and downstream of P2RX7, rs11615992, was disclosed to be in strong LD with rs3751143. The dual-luciferase assay confirmed that rs11615992 could alter target gene expression in lung cell line. Through chromosome conformation capture, it was verified that the region surrounding rs11615992 could interact with P2RX7 promoter and effect as an enhancer. By chromatin immunoprecipitation, the related transcription factor POU2F1 (POU class 2 homeobox 1) was recognized to bind the region spanning rs11615992. Our work identified a novel long-distance cis-regulatory SNP for P2RX7, which might contribute to multiple diseases.
KeywordsAllele-specific expression (ASE) P2RX7 rs11615992 rs3751143 Enhancer Expression regulation
We thank Ms. Catherine Southard for language editing. We are also grateful to the two anonymous reviewers for their helpful comments.
This work was supported by the Fundamental Research Funds for the Central Universities (GK201703031 and GK201701005) for Chang Sun and Joint project of Yunnan Provincial Science and Technology Department and Kunming Medical University (2017FE467-030) and High-Level Talent Training Program in Yunnan (D-201662) for Wei-Ping Fu.
Compliance with ethical standards
Conflict of interest
The authors declare that we have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
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