That was expected, since the developing embryos were exposed to the nicotine when theirmothers were treated.
结果表明,母鼠被注射尼古丁后,其后代在胚胎发育时期就会受尼古丁的影响,这一结果正如预期。
However, when the team did similar tests on the grand-offspring of the treated mothers,they got similar results.
但是,当研究团队对第三代大鼠进行类似检查时,发现了同样的情况,
Those grand-offspring had not been exposed to nicotine.
即使这些第三代大鼠并没有接触尼古丁。
The cause of the grand-offsprings asthma, Dr Rehan believes, is epigenetic modification.
Rehan博士认为,第三代大鼠的哮喘是表观遗传中的改性现象。
Nicotine is not only affecting lung cells, but also affecting sex cells in ways that cause thelungs which ultimately develop from those cells to express their genes in the sameabnormal ways.
尼古丁不仅侵袭肺部细胞,还会影响生殖细胞,使得生殖细胞在发育器官时,在肺部异常表达基因,导致新发育的肺部同样受到尼古丁的不良影响。
Exactly what those epigenetic changes are is hard to track down.
表观遗传现象具体引起了哪种变化,目前难以获知。
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