Figure 1.
Checkerboard-like cellular pattern in the mouse auditory epithelium. (A) Molecular interactions between nectins and cadherins (Takai and Nakanishi, 2003). α, α-catenin. (B) Expression pattern of DE-cadherin and DN-cadherin in the Drosophila retina (Hayashi and Carthew, 2004). All cells express DE-cadherin, but only cone cells express DN-cadherin. (C) Homophilic and heterophilic trans-interactions between nectins (Takai and Nakanishi, 2003). N1, nectin-1; N2, nectin-2; N3, nectin-3. Wide arrows, strong interactions; narrow arrows, weak interactions. (D) Cellular rearrangement of the auditory epithelium from embryonic day (E) 14 to E18 (McKenzie et al., 2004; Togashi et al., 2011). (Upper) Localization of ZO-1 at the apical surface of the auditory epithelium. OHCs, outer hair cells; IHC, inner hair cell. (Lower) Schematic illustrations of the cellular rearrangements. Red, differentiated hair cells; green, supporting cells. (E) Expression pattern of nectins and cadherins in the auditory epithelium (Simonneau et al., 2003; Togashi et al., 2011). Nectin-1 is expressed in hair cells, while nectin-3 is expressed in supporting cells. E-cadherin is expressed in the region including the outer hair cells (pink), and N-cadherin is expressed in the medial inner hair cell region (light green). Pillar cells express P-cadherin (light yellow). N1, nectin-1; N3, nectin-3. Red or green lines indicate nectin protein localizations at cell–cell boundaries. (F) Cellular patterning in the auditory epithelia of wild-type and nectin-3 knockout (KO) mice (Togashi et al., 2011). Arrows point to examples of aberrantly attached hair cells.