CDH23 and deafness: In addition, as regards one couple with a heterozygous variant of CDH23 and PCDH15, respectively, prenatal diagnosis results suggest that the foetus had double heterozygous (DH) variants of CDH23 and PCDH15, which has a high risk to cause ID/F type Usher syndrome.<h4>Conclusion</h4>Our study expanded the spectrum of deafness gene variation, which will contribute to the genetic diagnosis, prenatal diagnosis and the procreation guidance of deaf couple.