cone dystrophy/potasyòm

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Mutations in the gene KCNV2 encoding a voltage-gated potassium channel subunit cause "cone dystrophy with supernormal rod electroretinogram" in humans.

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"Cone dystrophy with supernormal rod electroretinogram (ERG)" is an autosomal recessive disorder that causes lifelong visual loss combined with a supernormal ERG response to a bright flash of light. We have linked the disorder to a 0.98-cM (1.5-Mb) region on chromosome 9p24, flanked by rs1112534 and

Large deletions of the KCNV2 gene are common in patients with cone dystrophy with supernormal rod response.

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Cone dystrophy with supernormal rod response (CDSRR) is considered to be a very rare autosomal recessive retinal disorder. CDSRR is associated with mutations in KCNV2, a gene that encodes a modulatory subunit (Kv8.2) of a voltage-gated potassium channel. In this study, we found that KCNV2 mutations

Characterization of the heteromeric potassium channel formed by kv2.1 and the retinal subunit kv8.2 in Xenopus oocytes.

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Kv8.2 (KCNV2) subunits do not form homotetrameric potassium channels, although they coassemble with Kv2.1 to constitute functional heteromers. High expression of Kv8.2 was reported in the human retina and its mutations were linked to the visual disorder "cone dystrophy with supernormal rod

Functional analysis of missense mutations in Kv8.2 causing cone dystrophy with supernormal rod electroretinogram.

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Mutations in KCNV2 have been proposed as the molecular basis for cone dystrophy with supernormal rod electroretinogram. KCNV2 codes for the modulatory voltage-gated potassium channel α-subunit, Kv8.2, which is incapable of forming functional channels on its own. Functional heteromeric channels are

Cone dystrophy with "supernormal" rod ERG: psychophysical testing shows comparable rod and cone temporal sensitivity losses with no gain in rod function.

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OBJECTIVE We report a psychophysical investigation of 5 observers with the retinal disorder "cone dystrophy with supernormal rod ERG," caused by mutations in the gene KCNV2 that encodes a voltage-gated potassium channel found in rod and cone photoreceptors. We compared losses for rod- and for

CENTRAL ELLIPSOID LOSS ASSOCIATED WITH CONE DYSTROPHY AND KCNV2 MUTATION.

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OBJECTIVE To report a case of central ellipsoid loss with supernormal rod electroretinogram and KCNV2 gene mutation. METHODS Retrospective case report. METHODS Thirty-eight-year-old man. RESULTS We report a patient with longstanding vision loss and photophobia who illustrated central atrophy of the

The Role of the Voltage-Gated Potassium Channel Proteins Kv8.2 and Kv2.1 in Vision and Retinal Disease: Insights from the Study of Mouse Gene Knock-Out Mutations.

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Mutations in the KCNV2 gene, which encodes the voltage-gated K⁺ channel protein Kv8.2, cause a distinctive form of cone dystrophy with a supernormal rod response (CDSRR). Kv8.2 channel subunits only form functional channels when combined in a heterotetramer with Kv2.1 subunits

Molecular characteristics of four Japanese cases with KCNV2 retinopathy: report of novel disease-causing variants.

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OBJECTIVE To describe the molecular characteristics of four Japanese patients with cone dystrophy with supernormal rod responses (CDSRR). METHODS Four individuals with a clinical and electrophysiological diagnosis of CDSRR were ascertained. The pathognomonic findings of the full-field

RETINA-specific expression of Kcnv2 is controlled by cone-rod homeobox (Crx) and neural retina leucine zipper (Nrl).

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Cone dystrophy with supernormal rod response (CDSRR) is an autosomal recessive disorder that leads to progressive retinal degeneration with a distinct electroretinogram (ERG) phenotype. CDSRR patients show reduced sensitivity to dim light, augmented response to suprathreshold light and reduced

The retinal clock drives the expression of Kcnv2, a channel essential for visual function and cone survival.

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OBJECTIVE The gene Kcnv2 codes for the voltage-gated potassium channel subunit Kv8.2, which can coassemble with Kv2.1 subfamily members to constitute functional voltage-gated potassium channels. Mutations in the Kcnv2 gene result in a retinal disorder designated "cone dystrophy with supernormal rod

Mizuo phenomenon in X-linked retinoschisis. Pathogenesis of the Mizuo phenomenon.

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Four unrelated males with X-linked retinoschisis and a golden fundus reflex had Mizuo-Nakamura phenomenon, which, to our knowledge, has been described only in Oguchi's disease and X-linked cone dystrophy. These findings, together with experimental observations and data from the literature, led us to

Push-pull model of the primate photopic electroretinogram: a role for hyperpolarizing neurons in shaping the b-wave.

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Existing models of the primate photopic electroretinogram (ERG) attribute the light-adapted b-wave to activity of depolarizing bipolar cells (DBCs), mediated through a release of potassium that is monitored by Müller cells. However, possible ERG contributions from OFF-bipolar cells (HBCs) and

KCNV2 retinopathy: clinical features, molecular genetics and directions for future therapy

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-associated retinopathy or "cone dystrophy with supernormal rod responses" is an autosomal recessive cone-rod dystrophy with pathognomonic ERG findings. This gene encodes Kv8.2, a voltage-gated potassium channel subunit that acts as a modulator by shifting the activation range of the K⁺

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