Conservation of Position-Specific Gene Expression in Axolotl Limb Skin

Conservation of Position-Specific Gene Expression in Axolotl Limb Skin
复制标题

蝾螈四肢皮肤位置特异性基因表达的保护

DOI:
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发表时间:
2014
期刊:
影响因子:
0.9
通讯作者:
Aki Makanae
Aki Makanae
中科院分区:
生物学4区
文献类型:
--
作者:
A. Satoh;Aki Makanae

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有尾两栖类动物在截肢后可以再生肢体。截肢后,未分化的细胞出现在截肢平面上,形成再生芽基。肢体芽基可以重新创造出原始肢体的完整复制品。众所周知,截肢前对肢体组织位置的干扰会扰乱肢体模式,这表明不同的完整肢体组织尽管外观相同,但却携带不同的位置信息。完整组织中这种差异的原因仍然未知。在这项研究中,我们发现,Lmx1b,Tbx2和Tbx3基因,这是在发展中的肢体在特定区域的方式表达,仍然可以检测到在一个成熟的蝾螈肢体。此外,这些位置特异性基因表达模式在成熟肢体中是保守的。治疗与维甲酸(RA),这是已知的腹侧活性,改变Lmx1b的表达在完整的背部皮肤和背侧字符腹侧,表明保守的Lmx1b的表达是由于背侧字符,而不是泄漏的基因表达。此外,我们发现这种保守的基因表达在再生芽基中是不稳定的。这些结果表明,蝾螈肢细胞可以识别它们的位置,并通过保守的发育基因的表达谱来维持肢体。
Urodele amphibians can regenerate their limbs after amputation. After amputation, undifferentiated cells appear on the amputation plane and form regeneration blastema. A limb blastema recreates a complete replica of the original limb. It is well known that disturbance of the location of limb tissues prior to amputation perturbs limb patterning, suggesting that different intact limb tissues carry different location information despite their identical appearance. The cause of such differences in intact tissues remains unknown. In this study, we found that Lmx1b, Tbx2, and Tbx3 genes, which are expressed in developing limb in a region specific manner, remained detectable in a mature axolotl limb. Furthermore, those position-specific gene expression patterns were conserved in mature limbs. Treatment with retinoic acid (RA), which is known to have ventralizing activity, changed Lmx1b expression in intact dorsal skin and dorsal character to ventral, indicating that conserved Lmx1b expression was due to the dorsal character and not leaky gene expression. Furthermore, we found that such conserved gene expression was rewritable in regeneration blastemas. These results suggest that axolotl limb cells can recognize their locations and maintain limbness via conserved expression profiles of developmental genes.
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