四膜虫早期成熟的创伤诱导
Traumatic induction of early maturity in tetrahymena.
作者信息
Nanney D L, Meyer E B
出版信息
Genetics. 1977 May;86(1):103-12. doi: 10.1093/genetics/86.1.103.
Exposure of conjugating pairs of Tetrahymena thermophila to high temperature (37 degrees) during macronuclear development causes an abortion of many macronuclei, but it also often induces an early appearance of sexual maturity in clones completing macronuclear development. Lines become mature after about 15 cell divisions rather than after 50 or more cell divisions in untreated pairs. The phenotype resembles that associated with Em (early maturity) mutants but, because it is not transmitted to the progeny in the next generation, it must be considered a phenocopy. The hypothesis is developed that an early genotype-environment incompatibiltiy, whether associated with an abnormal genotype or an unusual environment, activates a shunt mechanism permitting the organisms to undertake quickly an ordinarily forbidden sexual lottery.
在大核发育期间，将嗜热四膜虫的接合对暴露于高温（37摄氏度）会导致许多大核发育失败，但这也常常会在完成大核发育的克隆中诱导性成熟提前出现。品系在大约15次细胞分裂后变得成熟，而不是像未处理的配对那样在50次或更多次细胞分裂后才成熟。该表型类似于与Em（早熟）突变体相关的表型，但由于它不会传递给下一代的后代，因此必须将其视为拟表型。由此提出的假说是，早期的基因型-环境不相容性，无论与异常基因型还是不寻常环境相关，都会激活一种分流机制，使生物体能够迅速进行通常被禁止的有性选择。
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