Thyroid Hormone Receptor Beta Mutations Alter Photoreceptor Development and Function in Danio Rerio (zebrafish)

Overview

Journal PLoS Genet

Specialty Genetics

Date 2020 Jun 23

PMID 32569302

Citations 18

Authors

Ciana Deveau

Xiaodong Jiao

Sachihiro C Suzuki

Asha Krishnakumar

Takeshi Yoshimatsu

J Fielding Hejtmancik

Ralph F Nelson

Affiliations

Soon will be listed here.

Abstract

We investigate mutations in trβ2, a splice variant of thrb, identifying changes in function, structure, and behavior in larval and adult zebrafish retinas. Two N-terminus CRISPR mutants were identified. The first is a 6BP+1 insertion deletion frameshift resulting in a truncated protein. The second is a 3BP in frame deletion with intact binding domains. ERG recordings of isolated cone signals showed that the 6BP+1 mutants did not respond to red wavelengths of light while the 3BP mutants did respond. 6BP+1 mutants lacked optomotor and optokinetic responses to red/black and green/black contrasts. Both larval and adult 6BP+1 mutants exhibit a loss of red-cone contribution to the ERG and an increase in UV-cone contribution. Transgenic reporters show loss of cone trβ2 activation in the 6BP+1 mutant but increase in the density of cones with active blue, green, and UV opsin genes. Antibody reactivity for red-cone LWS1 and LWS2 opsin was absent in the 6BP+1 mutant, as was reactivity for arrestin3a. Our results confirm a critical role for trβ2 in long-wavelength cone development.

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