The phosphate exporter xpr1b is required for differentiation of tissue-resident macrophages.

The phosphate exporter xpr1b is required for differentiation of tissue-resident macrophages.
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DOI:
10.1016/j.celrep.2014.08.018
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发表时间:
2014-09-25
期刊:
影响因子:
8.8
通讯作者:
Talbot WS
Talbot WS
中科院分区:
生物学1区
文献类型:
--
作者:
Meireles AM;Shiau CE;Guenther CA;Sidik H;Kingsley DM;Talbot WS

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磷酸盐浓度在细胞和生物体水平上受到严格的调节。最近发现了第一个后生动物磷酸盐输出蛋白XPR 1,但其体内功能仍不清楚。在遗传筛选中,我们在斑马鱼的人类XPR 1直系同源基因xpr 1b中发现了一个突变。XPR 1B突变体缺乏小胶质细胞,即存在于脑中的特化巨噬细胞,并且还显示出破骨细胞功能缺陷的骨硬化表型特征。转基因表达研究表明xpr 1b在发育中的巨噬细胞中自主发挥作用。XPR 1B突变体没有显示出可能由磷酸盐失衡引起的总体发育缺陷。我们构建了xpr 1a的靶向突变,这是斑马鱼基因组中xpr 1b的重复,以确定Xpr 1a和Xpr 1b是否具有冗余功能。xpr 1a的单突变体是可行的,xpr 1b的双突变体; xpr 1a与xpr 1b的单突变体相似。我们的遗传分析揭示了磷酸盐出口Xpr 1在组织巨噬细胞分化中的特定作用。
Phosphate concentration is tightly regulated at the cellular and organismal levels. The first metazoan phosphate exporter, XPR1, was recently identified, but its in vivo function remains unknown. In a genetic screen, we identified a mutation in a zebrafish ortholog of human XPR1, xpr1b. xpr1b mutants lack microglia, the specialized macrophages that reside in the brain, and also displayed an osteopetrotic phenotype characteristic of defects in osteoclast function. Transgenic expression studies indicated that xpr1b acts autonomously in developing macrophages. xpr1b mutants displayed no gross developmental defects that may arise from phosphate imbalance. We constructed a targeted mutation of xpr1a, a duplicate of xpr1b in the zebrafish genome, to determine if Xpr1a and Xpr1b have redundant functions. Single mutants for xpr1a were viable, and double mutants for xpr1b;xpr1a were similar to xpr1b single mutants. Our genetic analysis reveals a specific role for the phosphate exporter Xpr1 in differentiation of tissue macrophages.
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