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Cone degeneration in two Shih Tzu dogs: clinical and genetic investigation
Journal article   Open access   Peer reviewed

Cone degeneration in two Shih Tzu dogs: clinical and genetic investigation

Tatiana Assunção de Moraes, Angélica de Mendonça Vaz Safatle, Erin Burnight, Budd Tucker and Gil Ben-Shlomo
Ciência rural, Vol.55(8), e20240397
06/01/2025
DOI: 10.1590/0103-8478cr20240397
url
https://doi.org/10.1590/0103-8478cr20240397View
Published (Version of record) Open Access

Abstract

Two cases of cone degeneration in adult Shih Tzu canine patients are reported herein. Definitive diagnosis was made based on the ophthalmic examination finding, typical clinical signs, and characteristic electroretinography results that demonstrated normal rod function and absence of recordable cone function. Sanger sequencing of the entire coding sequence of the cyclic nucleotide gated channel β3 (CNGB3) gene did not reveal disease causing variants in these dogs. To the authors’ knowledge, this is the first report of clinical, electroretinographic and genetic investigation of cone degeneration in Shih Tzu.
achromatopsia cone degeneration day blindness electroretinogram hemeralopia Shih Tzu

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