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Updated: Jun 20, 2026

Wild-type Blocking PCR Combined with Sanger Sequencing for Detection of Low-frequency Somatic Mutation
Published on: August 23, 2024
Novel mutation in a case of TTLL5-associated cone dystrophy with a characteristic 'solar flare' sign
Blake G Archer1, Cecinio C Ronquillo2
1Tilman J. Fertitta Family College of Medicine, University of Houston, Houston, Texas, USA.
Background/Purpose:
TTLL5-associated retinal dystrophy is a rare inherited retinopathy with a limited number of reported cases. We report a novel homozygous frameshift mutation in TTLL5 causing adult-onset cone-rod dystrophy, expanding the known clinical and mutational spectrum of this condition.
Methods:
Retrospective case report utilizing multimodal longitudinal imaging, clinical examination, and molecular genetic testing in a single patient.
Results:
A 49-year-old male presented with progressive visual decline over 4 years. Multimodal imaging demonstrated parafoveal ellipsoid zone loss consistent with a cone-rod dystrophy pattern. Genetic testing identified a novel homozygous TTLL5 frameshift mutation (c.2429del, p.Lys810Argfs*35) localized within the cofactor interaction domain.
Conclusions:
This case expands the clinical spectrum of TTLL5-related retinopathies and underscores the utility of genetic testing and multimodal imaging in the diagnosis of inherited retinal diseases.
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