Emergence of a Bilaterally Symmetric Pattern from Chiral Components in the Planarian Epidermis.

Emergence of a Bilaterally Symmetric Pattern from Chiral Components in the Planarian Epidermis.
Dev Cell. 2019 Nov 18;51(4):516-525.e5
Authors: Basquin C, Ershov D, Gaudin N, Vu HT, Louis B, Papon JF, Orfila AM, Mansour S, Rink JC, Azimzadeh J
Abstract
Most animals exhibit mirror-symmetric body plans, yet the molecular constituents from which they are formed are often chiral. In planarian flatworms, centrioles are arranged in a bilaterally symmetric pattern across the ventral epidermis. Here, we found that this pattern is generated by a network of centrioles with prominent chiral asymmetric properties. We identify centriole components required for establishing asymmetric connections between centrioles and balancing their effects to align centrioles along polarity fields. SMED-ODF2, SMED-VFL1, and SMED-VFL3 affect the assembly of centriole appendages that tether cytoskeletal connectors to position the centrioles. We further show that the medio-lateral polarization of centrioles relies on mechanisms that are partly distinct on the left and right sides of the planarian body. Our findings shed light on how bilaterally symmetrical patterns can emerge from chiral cellular organizations.
PMID: 31743665 [PubMed - in process]

Source: Developmental Cell - November 17, 2019 Category: Cytology Authors: Basquin C, Ershov D, Gaudin N, Vu HT, Louis B, Papon JF, Orfila AM, Mansour S, Rink JC, Azimzadeh J Tags: Dev Cell Source Type: research