- Form gap junctions via hexad of 6 connexin proteins
- Autosomal dominant - form heterodimers with normal protein
- Connexin 26 (GJB2)
- KID syndrome (Keratitis, Ichthyosis, Deafness)
- Vohwinkel syndrome
- Bart-Pumphrey Syndrome
- PPK with deafness
- Non-syndromic deafness
- Connexin 30 (GJB6)
- Hidrotic ectodermal dysplasia
- KID syndrome
- Connexin 31 (GJB3), Connexin 30.3 (GJB 4)
- Erythrokeratoderma variabilis
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