Baena-Lopez L A, García-Bellido A
Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid Edificio Ciencias, CX-504 28049 Madrid, Spain.
Proc Natl Acad Sci U S A. 2006 Sep 12;103(37):13734-9. doi: 10.1073/pnas.0606092103. Epub 2006 Sep 1.
The size and shape of organs depend on cellular processes such as cell proliferation, cell survival, and spatial arrangement of cells. In turn, all of these processes are a consequence of positional identity of individual cells in whole organs. Links of positional information with organ growth and pattern expression of genes is a little-addressed question. We show that differences in vestigial expression between neighboring cells of the wing blade autonomously and nonautonomously affect cell proliferation along the proximo-distal axis. On the other hand, uniform expression of vestigial inhibits cell proliferation and also perturbs the shape of wing blade altering the preferential orientation of cell divisions. Our observations provide evidence that local cell interactions, triggered by differences in vestigial expression between neighboring cells, confer positional values operating in the control of growth and shape of the wing.
器官的大小和形状取决于细胞增殖、细胞存活以及细胞空间排列等细胞过程。反过来,所有这些过程都是整个器官中单个细胞位置身份的结果。位置信息与器官生长和基因模式表达之间的联系是一个鲜有涉及的问题。我们发现,翼片相邻细胞之间残翅基因表达的差异会自主且非自主地影响沿近远轴的细胞增殖。另一方面,残翅基因的均匀表达会抑制细胞增殖,还会扰乱翼片形状,改变细胞分裂的优先方向。我们的观察结果提供了证据,即相邻细胞之间残翅基因表达差异引发的局部细胞相互作用赋予了在控制翅膀生长和形状中起作用的位置值。