BRAFWTNEGASSAY would make sense to the owner of the file or someone working in that particular project. Consider it a project name, or a keyword that is relevant in that particular context. If you're working with files from different sources with multiple contributors this sort of approach works brilliantly.

You could have named it differently: 2013-06-26_KUTKLOON7_Plasmid-Cellline-100-1MutantFrac

Creation date can sometimes be lost if you copy/move the file between different mediums