P{SUPor-P} insertion in the 5' UTR. The P{SUPor-P} element is transcribed and spliced into the A and D transcripts, leaving a portion of the element within the transcript but removing a portion of the wild-type Atxn7 5' UTR.
Atxn7KG02020/Df(2L)Exel7011 transheterozygotes are lethal.