They found that 2836 patientswith no family history carried genetic variants associated with the followingdiseases (number and [frequency] of carriers): citrin deficiency (111 [3.91%]),GJB2-related DFNB1 nonsyndromic hearing loss (106 [3.74%]), Krabbes disease (80[2.82%]), Usher syndrome type 2A (76 [2.68%]), α-thalassemia (66 [2.33%]),and Wilson disease (66 [2.33%]) (Xi etal., 2020). Here, GJB2 is linked to Usher syndrome type 2.