genesis
noun [ S ] formal uk/ˈdʒen.ə.sɪs/ us/ˈdʒen.ə.sɪs/
（事物的）形成，发生，起源，创始
the origin of something, when it is begun or starts to exist
The story had its genesis in a conversation the author had with his mother. 故事以作者与母亲的一段对话开始。
research into the genesis of cancer 对癌症病因的研究