amorphic allele - molecular evidence
23bp deletion plus 8bp insertion in the N-terminal part of the Mettl1 transcription unit; results in a frameshift.
31bp are deleted and replaced with 8bp (CTCGCCAG) in Mettl1 leading to a frameshift.
CTCGCCAG
female semi-fertile (with Mettl1KO1)
female semi-sterile | recessive
male semi-sterile
Mettl1KO2 is rescued by Mettl1+tKa