Browsing by Author "Barndt, Robert J."

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    Allele-specific control of rodent and human lncRNA KMT2E-AS1 promotes hypoxic endothelial pathology in pulmonary hypertension
    (American Association for the Advancement of Science, 2024) Tai, Yi-Yin; Yu, Qiujun; Tang, Ying; Sun, Wei; Kelly, Neil J.; Okawa, Satoshi; Zhao, Jingsi; Schwantes-An, Tae-Hwi; Lacoux, Caroline; Torrino, Stephanie; Al Aaraj, Yassmin; El Khoury, Wadih; Negi, Vinny; Liu, Mingjun; Corey, Catherine G.; Belmonte, Frances; Vargas, Sara O.; Schwartz, Brian; Bhat, Bal; Chau, B. Nelson; Karnes, Jason H.; Satoh, Taijyu; Barndt, Robert J.; Wu, Haodi; Parikh, Victoria N.; Wang, Jianrong; Zhang, Yingze; McNamara, Dennis; Li, Gang; Speyer, Gil; Wang, Bing; Shiva, Sruti; Kaufman, Brett; Kim, Seungchan; Gomez, Delphine; Mari, Bernard; Cho, Michael H.; Boueiz, Adel; Pauciulo, Michael W.; Southgate, Laura; Trembath, Richard C.; Sitbon, Olivier; Humbert, Marc; Graf, Stefan; Morrell, Nicholas W.; Rhodes, Christopher J.; Wilkins, Martin R.; Nouraie, Mehdi; Nichols, William C.; Desai, Ankit A.; Bertero, Thomas; Chan, Stephen Y.; Medicine, School of Medicine
    Hypoxic reprogramming of vasculature relies on genetic, epigenetic, and metabolic circuitry, but the control points are unknown. In pulmonary arterial hypertension (PAH), a disease driven by hypoxia inducible factor (HIF)-dependent vascular dysfunction, HIF-2α promoted expression of neighboring genes, long noncoding RNA (lncRNA) histone lysine N-methyltransferase 2E-antisense 1 (KMT2E-AS1) and histone lysine N-methyltransferase 2E (KMT2E). KMT2E-AS1 stabilized KMT2E protein to increase epigenetic histone 3 lysine 4 trimethylation (H3K4me3), driving HIF-2α-dependent metabolic and pathogenic endothelial activity. This lncRNA axis also increased HIF-2α expression across epigenetic, transcriptional, and posttranscriptional contexts, thus promoting a positive feedback loop to further augment HIF-2α activity. We identified a genetic association between rs73184087, a single-nucleotide variant (SNV) within a KMT2E intron, and disease risk in PAH discovery and replication patient cohorts and in a global meta-analysis. This SNV displayed allele (G)-specific association with HIF-2α, engaged in long-range chromatin interactions, and induced the lncRNA-KMT2E tandem in hypoxic (G/G) cells. In vivo, KMT2E-AS1 deficiency protected against PAH in mice, as did pharmacologic inhibition of histone methylation in rats. Conversely, forced lncRNA expression promoted more severe PH. Thus, the KMT2E-AS1/KMT2E pair orchestrates across convergent multi-ome landscapes to mediate HIF-2α pathobiology and represents a key clinical target in pulmonary hypertension.