DSCR1 (ADAPT78) lethality: evidence for a protective effect of trisomy 21 genes?

DSCR1 (ADAPT78) lethality: evidence for a protective effect of trisomy 21 genes?
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DSCR1 (ADAPT78) 致死性:21 三体基因保护作用的证据?

DOI:
10.1016/j.bbrc.2005.09.069
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发表时间:
2005
期刊:
Biochemical and biophysical research communications.
影响因子:
--
通讯作者:
Crawford,DanaR
Crawford,DanaR
中科院分区:
--
文献类型:
--
作者:
Kluetzman,KerriS;Perez,AnaV;Crawford,DanaR

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在过去的几年中,越来越多的证据表明DSCR1 (ADAPT78)可能参与唐氏综合征。为了验证这一点,我们试图产生DSCR1转基因小鼠。令人惊讶的是,几乎在每个案例中都观察到胚胎死亡。在C57Bl/6小鼠中,DSCR1人转基因在致死前和9.5天的发育胚胎中被鉴定出来。同时观察其mRNA的表达,并与对照组比较。在转基因存活到足月的罕见情况下(两次),没有观察到mRNA表达,这表明表达是致死性所必需的。这种致死性表型与唐氏综合症小鼠模型形成对比,令人惊讶的是,唐氏综合症小鼠模型中包括Dscr1在内的多个21号染色体基因过度表达并存活至足月。为了解释DSCR1本身而不是与其他三体基因结合的看似矛盾的致命作用,我们提出一些三体基因(包括DSCR1)赋予致命作用,但其他三体基因抑制它。
Over the last several years, suggestive evidence has accrued supporting a possible involvement for DSCR1 (ADAPT78) in Down syndrome. Toward testing this, we attempted to generate DSCR1 transgenic mice. Surprisingly, in almost every case, embryonic lethality was observed. In C57Bl/6 mice, DSCR1 human transgene was identified in developing embryos prior to lethality and up to day 9.5. Its mRNA expression was also observed and varied relative to control. In rare instances (twice) where transgenics survived to term, no mRNA expression was observed, suggesting that expression is required for lethality. This lethal phenotype contrasted with, and was surprising in light of, mouse models of Down syndrome where multiple chromosome 21 genes including Dscr1 are overexpressed and survive to term. To explain the seemingly contradictory lethal effect of DSCR1 by itself but not in combination with other trisomy genes, we propose that some trisomy genes (including DSCR1) confer lethality, but others suppress it.
兔骨髓对人脱唾液酸转铁蛋白的半乳糖特异性消除。
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