|ZFIN ID: ZDB-PUB-200623-5|
Thyroid hormone receptor beta mutations alter photoreceptor development and function in Danio rerio (zebrafish)
Deveau, C., Jiao, X., Suzuki, S.C., Krishnakumar, A., Yoshimatsu, T., Hejtmancik, J.F., Nelson, R.F.
|Source:||PLoS Genetics 16: e1008869 (Journal)|
|Registered Authors:||Hejtmancik, J. Fielding, Nelson, Ralph|
|PubMed:||32569302 Full text @ PLoS Genet.|
Deveau, C., Jiao, X., Suzuki, S.C., Krishnakumar, A., Yoshimatsu, T., Hejtmancik, J.F., Nelson, R.F. (2020) Thyroid hormone receptor beta mutations alter photoreceptor development and function in Danio rerio (zebrafish). PLoS Genetics. 16:e1008869.
ABSTRACTWe 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.