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标题：B3GALT5 knockout alters glycosphingolipid profile and facilitates transition to human naïve pluripotency
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作者：Ruey-Jen Lin ; Ming-Wei Kuo ; Bei-Chia Yang 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2020
卷号：117
期号：44
页码：27435-27444
DOI：10.1073/pnas.2003155117
出版社：The National Academy of Sciences of the United States of America
摘要：Conversion of human pluripotent stem cells from primed to naïve state is accompanied by altered transcriptome and methylome, but glycosphingolipid (GSL) profiles in naïve human embryonic stem cells (hESCs) have not been systematically characterized. Here we showed a switch from globo-(SSEA-3, SSEA-4, and Globo H) and lacto-series (fucosyl-Lc4Cer) to neolacto-series GSLs (SSEA-1 and H type 2 antigen), along with marked down-regulation of β-1,3-galactosyltransferase (B3GALT5) upon conversion to naïve state. CRISPR/Cas9-generated B3GALT5- knockout (KO) hESCs displayed an altered GSL profile, increased cloning efficiency and intracellular Ca 2 , reminiscent of the naïve state, while retaining differentiation ability. The altered GSLs could be rescued through overexpression of B3GALT5. B3GALT5- KO cells cultured with 2iLAF exhibited naïve-like transcriptome, global DNA hypomethylation, and X-chromosome reactivation. In addition, B3GALT5 -KO rendered hESCs more resistant to calcium chelator in blocking entry into naïve state. Thus, loss of B3GALT5 induces a distinctive state of hESCs displaying unique GSL profiling with expression of neolacto-glycans, increased Ca 2 , and conducive for transition to naïve pluripotency.
关键词：B3GALT5 ; human embryonic stem cells ; glycosphingolipids ; intracellular calcium ; naïve pluripotency