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关于克隆与繁殖概念的探讨 总被引:1,自引:0,他引:1
现代的克隆概念具广泛的含义,将克隆称为无性系、无性繁殖或释为复制等,其意义均是不完整的,所培育的克隆或转基因生物等涉及营养繁殖、无性生殖、有性生殖、单性生殖等繁殖类型;因此,建议把培育具有相同遗传性状个体群的克隆概念依繁殖类型定义为:(1)营养体纯系,或称营养体克隆;(2)孢子生殖纯系,或称孢子克隆;(3)单性生殖纯系,或称单性克隆;(4)核融合纯系,或称核融合克隆。并赞成克隆的基本含义为“纯系”。 相似文献
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激光诱发家蚕孤雌生殖的研究 总被引:1,自引:0,他引:1
采用 CO2激光扩束辐照诱发家蚕孤雌生殖,获得着色卵率约60%,转青卵率约31%,孵化率只占转青率的1.85%,全是雌蚕,其发育机制属非减数分裂型,没有出现畸形蚕,茧质未下降。从激光诱发的孤雌生殖的后代中,初步选出两个新类型的可作育种材料。
Abstrect:In order to induce silkworm(Bombyx mori)parthenogenesis,we irradiated eggs by Co2 laser.The results showed,60% colored eggs,31% average bluish eggs,only 1.85% hatchavility among the bluish eggs,all female from those eggs and so an ameiosis parthenogenesis;no malformed worm,thus similar constitution and quality to their parents;and finally two new strains which can be used to breed new strains and furhther studies. 相似文献
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Activation of paternally expressed imprinted genes in newly derived germline-competent mouse parthenogenetic embryonic stem cell lines 总被引:2,自引:0,他引:2
Jiang H Sun B Wang W Zhang Z Gao F Shi G Cui B Kong X He Z Ding X Kuang Y Fei J Sun YJ Feng Y Jin Y 《Cell research》2007,17(9):792-803
Parthenogenetic embryonic stem (pES) cells provide a valuable in vitro model system for studying the molecular mechanisms that underlie genomic imprinting. However, the pluripotency of pES cells and the expression profiles of paternally expressed imprinted genes have not been fully explored. In this study, three mouse pES cell lines were established and the differentiation potential of these cells in extended culture was evaluated. The undifferentiated cells had a normal karyotype and homozygous genome, and expressed ES-cell-specific molecular markers. The cells remained undifferentiated after more than 50 passages and exhibited pluripotent differentiation capacity. All three lines of the established ES cells produced teratomas; two lines of ES cells produced chimeras and germline transmission. Furthermore, activation of the paternally expressed imprinted genes Snrpn, U2afl-rsl, Peg3, Impact, Zfp127, Dlkl and Mest in these cells was detected. Some paternally expressed imprinted genes were found to be expressed in the blastocyst stage of parthenogenetically activated embryos in vitro and their expression level increased with extended pES cell culture. Furthermore, our data show that the activation of these paternally expressed imprinted genes in pES cells was associated with a change in the methylation of the related differentially methylated regions. These findings provide direct evidence for the pluripotency of pES cells and demonstrate the association between the DNA methylation pattern and the activa- tion of paternally expressed imprinted genes in pES cells. Thus, the established ES cell lines provide a valuable model for studying epigenetic regulation in mammalian development. 相似文献
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激光诱导杨树单性生殖的研究:Ⅵ.子房愈伤组织的无性繁殖系… 总被引:1,自引:0,他引:1
试验已获得用He-Ne激光诱导洲黑杨“169”杨子房愈伤组织的无性繁殖系“clone14”,经细胞学分析,证明它是起源于雌配子体的母系单倍体。经过两年来的继代培养,其愈伤组织的品质已越来越趋于纯化,用它的次生愈伤组织,在适合的分化培养基上,芽分化率由原来的20%提高到55%以上,而且切取分化根,进行芽分化培养,也能长芽。 相似文献
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Cheng L 《Cell research》2008,18(2):215-217
Two papers [1, 2] published in a recent issue of Cell Research describe the derivation of pluripotent human embryonic stem (hES)-like cell lines from parthenogeneic blastocysts. 相似文献