An indel that creates a nonsense mutation leading to Noc1 mRNAs being translated into a short polypeptidic sequence of 29 amino acids.
AT
The sequence "GTTG" is replaced with "AT" at codon G8 of Noc1 leading to a frameshift and early translation termination after the addition of 22 novel amino acids. There are also two base substitutions in the 5' UTR.