Although we and others (Richardson et al., 2019) found coloboma in zebrafish knockdown experiments of ntn1a, we observed coloboma with microphthalmia in the context of complete knockout of ntn1a. This more severe phenotype in the complete absence of ntn1a implies there could be a more general requirement for Netrin-1 during early eye development, or could reflect teleost-specific eye developmental processes not shared among higher vertebrates (Martinez-Morales et al., 2017). Here, NTN1 is linked to coloboma.