GJB2 and deafness: During the years of follow‐up, each patient was explored for known deafness and cataract genes by Sanger sequencing (in particular for GJB2, one of the patient being an heterozygous carrier of the c.30delG well‐known recurrent pathogenic variant) but also using larger assays such as whole‐exome sequencing (WES) with a specific focus on known deafness and cataract genes (Appendix Table S1) and standard chromosomal explorations (karyotype and chromosomal microarray analysis), but all were negative (see Appendix Supplementary Methods).