In short, Myriad isolated the BRCA genes—snipped them out of the longer DNA chain in which they were ensconced.
According to family and friends, this video is a window into the secretive world Sisk has been ensconced in for several years now.
But that place is outside the Knesset or Congress, pressing in, not ensconced and privileged and from the inside.
1580s, "to cover with a fort," from en- (1) "make, put in" + sconce "small fortification, shelter," perhaps via French, probably from Dutch schans "earthwork" (cf. Middle High German schanze "bundle of sticks"), of uncertain origin. Related: Ensconced.