Achromatopsia

The CNGB3 p.T383fsX mutation results from a founder effect and is responsible for the visual phenotype in the original report of uniparental disomy 14

Wojciech Wiszniewski, Richard Alan Lewis, James R. Lupski

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Achromatopsia (ACHM) or rod monochromacy is an autosomal recessive and genetically heterogeneous retinal disorder. It is characterized by a lack of color discrimination, poor visual acuity, photodysphoria, pendular infantile nystagmus, and abnormal photopic electroretinographic (ERG) recordings with preservation of rod-mediated function. Mutations in three known genes are causative; including genes for the α and β subunits of the cyclic nucleotide-gated cation channel (CNGA3 and CNGB3, respectively) and cone photoreceptor transducin-NNAT2. We investigated the prevalence of mutations in achromatopsia-causing genes in a cohort of 16 families with both clinical and electrophysiologic evidence consistent with autosomal recessive transmission, including one subject with achromatopsia and maternal isodisomy for chromosome 14. The most frequent mutation, p.T383fsX in CNGB3, accounted for 75% (18/24) of disease-associated alleles; intragenic SNPs in unrelated patients revealed transmission of a common haplotype consistent with a founder effect. Homozygous p.T383fsX mutation in CNGB3 that maps to chromosome 8 was detected in a patient with achromatopsia and systemic features associated with uniparental disomy (UPD) of chromosome 14. Two novel variants, p.R223G and p.A621E were found in CNGA3. We conclude that CNGA3 and CNGB3 mutations are responsible for the substantial majority of achromatopsia. Furthermore, the CNGB3 mutation p.T383fsX is a predominant mutation, results from a founder effect, and is responsible for the ACHM in the original clinical report of UPD 14.

Original languageEnglish (US)
Pages (from-to)433-439
Number of pages7
JournalHuman Genetics
Volume121
Issue number3-4
DOIs
StatePublished - May 2007
Externally publishedYes

Fingerprint

Uniparental Disomy
Color Vision Defects
Founder Effect
Phenotype
Mutation
Chromosomes, Human, Pair 14
Cyclic Nucleotide-Gated Cation Channels
Transducin
Genes
Pathologic Nystagmus
Retinal Cone Photoreceptor Cells
Chromosomes, Human, Pair 8
Haplotypes
Visual Acuity
Single Nucleotide Polymorphism
Color
Alleles
Mothers

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Achromatopsia : The CNGB3 p.T383fsX mutation results from a founder effect and is responsible for the visual phenotype in the original report of uniparental disomy 14. / Wiszniewski, Wojciech; Lewis, Richard Alan; Lupski, James R.

In: Human Genetics, Vol. 121, No. 3-4, 05.2007, p. 433-439.

Research output: Contribution to journalArticle

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abstract = "Achromatopsia (ACHM) or rod monochromacy is an autosomal recessive and genetically heterogeneous retinal disorder. It is characterized by a lack of color discrimination, poor visual acuity, photodysphoria, pendular infantile nystagmus, and abnormal photopic electroretinographic (ERG) recordings with preservation of rod-mediated function. Mutations in three known genes are causative; including genes for the α and β subunits of the cyclic nucleotide-gated cation channel (CNGA3 and CNGB3, respectively) and cone photoreceptor transducin-NNAT2. We investigated the prevalence of mutations in achromatopsia-causing genes in a cohort of 16 families with both clinical and electrophysiologic evidence consistent with autosomal recessive transmission, including one subject with achromatopsia and maternal isodisomy for chromosome 14. The most frequent mutation, p.T383fsX in CNGB3, accounted for 75{\%} (18/24) of disease-associated alleles; intragenic SNPs in unrelated patients revealed transmission of a common haplotype consistent with a founder effect. Homozygous p.T383fsX mutation in CNGB3 that maps to chromosome 8 was detected in a patient with achromatopsia and systemic features associated with uniparental disomy (UPD) of chromosome 14. Two novel variants, p.R223G and p.A621E were found in CNGA3. We conclude that CNGA3 and CNGB3 mutations are responsible for the substantial majority of achromatopsia. Furthermore, the CNGB3 mutation p.T383fsX is a predominant mutation, results from a founder effect, and is responsible for the ACHM in the original clinical report of UPD 14.",
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