The occurrence of different sulphated cell surface glycoproteins correlates with defined developmental events in Volvox
The occurrence of different sulphated cell surface glycoproteins correlates with defined developmental events in Volvox
复制标题
不同硫酸化细胞表面糖蛋白的出现与 Volvox 中确定的发育事件相关
DOI：
10.1016/0014-5793(82)80123-3
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发表时间：
1982
期刊：
影响因子：
3.5
通讯作者：
M. Sumper
中科院分区：
文献类型：
--
作者：
S. Wenzl;M. Sumper
绿藻Volvox具有不同寻常的属性组合，使其在研究胚胎发育和细胞分化的生物化学方面独一无二。无性有机体只有两种细胞类型：体细胞和生殖细胞。约2000-4000个体细胞以单层形式分布在中空球体(球体)的表面；8-16个生殖细胞(生殖器)位于球体的后部。伯尔。当子体大约是最终大小的四分之一时，它们通过酶作用破坏母体鞘物质形成的大孔从母体释放出来。每个生殖细胞在一系列卵裂中形成一个新的子体球体。在卵裂期间，不对称分裂(在32细胞胚胎阶段)从继续分裂的体细胞原始细胞中划出16个生殖细胞(此时停止分裂)。在细胞分裂结束时，胚胎由数以千计的体细胞和16个较大的生殖细胞组成[L-3]。此时胚胎进入倒置过程，从而使胚胎由内向外翻转。这种倒置过程与脊椎动物141中的原肠形成等形态发生事件有着惊人的相似之处。倒置后，体细胞开始分泌鞘物质，导致每个细胞与相邻细胞分开。生物体现在长得更大了，但不是细胞数量-
The green alga Volvox has an unusual combination of attributes that make it unique for studying the biochemistry of embryonic development and cellular differentiation. The asexual organism consists of only 2 cell types: somatic and reproductive. About 2000-4000 somatic cells are located as a single layer on the surface of a hollow sphere (spheroid); 8-16 reproductive cells (gonidia) are positioned within the spheroid in the posterior region. ber. When the daughter spheroids are about a quarter their final size they are released from the parent through large pores formed by enzymatic disruption of the parent sheath material.A new daughter spheroid is formed from each reproductive cell in a series of cleavages. During cleavage an asymmetric division (at the stage of the 32 cell embryo) delineates 16 reproductive cells (which cease division at that time) from the somatic cell initials which continue cleavage. At the termination of cell divisions, the embryo consists of thousands of somatic cell initials and 16 larger reproductive cells [l-3]. At this time the embryo enters the process of inversion, thereby turning the embryo inside-out. This inversion process bears striking resemblances to morphogenetic events such as gastrulation in vertebrates 141. After inversion, the somatic cells begin to secrete sheath material causing each cell to move apart from its neighbours. The organism now grows in size but not cell num-