July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Olfactory dysfunction in patients with CNGB1-related retinitis pigmentosa
Author Affiliations & Notes
  • Peter Charbel Issa
    Oxford Eye Hospital, University of Oxford, Oxford, United Kingdom
    Nuffield Laboratory of Ophthalmology, Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
  • Peggy Reuter
    Centre for Ophthalmology, Institute for Ophthalmic Research, University of Tübingen, Tübingen, Germany
  • Laura Kuehlewein
    Centre for Ophthalmology, Institute for Ophthalmic Research, University of Tübingen, Tübingen, Germany
  • Johannes Birtel
    Department of Ophthalmology, University of Bonn, Bonn, Germany
  • Martin Gliem
    Oxford Eye Hospital, University of Oxford, Oxford, United Kingdom
    Department of Ophthalmology, University of Bonn, Bonn, Germany
  • Anke Tropitzsch
    Department of Otorhinolaryngology, Head and Neck Surgery, University of Tübingen, Tübingen, Germany
  • Katherine Whitcroft
    UCL Ear Institute and Royal National Throat Nose and Ear Hospital, London, United Kingdom
  • Hanno Bolz
    Institute of Human Genetics, University Hospital of Cologne, Cologne, Germany
  • Kenji Ishihara
    Department of Ophthalmology and Visual Sciences, Kyoto University, Kyoto, Japan
  • Robert E MacLaren
    Oxford Eye Hospital, University of Oxford, Oxford, United Kingdom
    Nuffield Laboratory of Ophthalmology, Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
  • Susan Downes
    Oxford Eye Hospital, University of Oxford, Oxford, United Kingdom
    Nuffield Laboratory of Ophthalmology, Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
  • Akio Oishi
    Department of Ophthalmology and Visual Sciences, Kyoto University, Kyoto, Japan
  • Eberhart Zrenner
    Centre for Ophthalmology, Institute for Ophthalmic Research, University of Tübingen, Tübingen, Germany
  • Susanne Kohl
    Centre for Ophthalmology, Institute for Ophthalmic Research, University of Tübingen, Tübingen, Germany
  • Thomas Hummel
    Smell & Taste Clinic, Department of Otorhinolaryngology, Head and Neck Surgery, Technische Universität Dresden, Dresden, Germany
  • Footnotes
    Commercial Relationships   Peter Charbel Issa, None; Peggy Reuter, None; Laura Kuehlewein, None; Johannes Birtel, None; Martin Gliem, None; Anke Tropitzsch, None; Katherine Whitcroft, None; Hanno Bolz, None; Kenji Ishihara, None; Robert MacLaren, None; Susan Downes, None; Akio Oishi, None; Eberhart Zrenner, None; Susanne Kohl, None; Thomas Hummel, None
  • Footnotes
    Support  Oxford NIHR Biomedical Research Centre, Pro Retina Deutschland
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 1565. doi:
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      Peter Charbel Issa, Peggy Reuter, Laura Kuehlewein, Johannes Birtel, Martin Gliem, Anke Tropitzsch, Katherine Whitcroft, Hanno Bolz, Kenji Ishihara, Robert E MacLaren, Susan Downes, Akio Oishi, Eberhart Zrenner, Susanne Kohl, Thomas Hummel; Olfactory dysfunction in patients with CNGB1-related retinitis pigmentosa. Invest. Ophthalmol. Vis. Sci. 2018;59(9):1565.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : To report olfactory function and retinal phenotype in patients with bi-allelic mutations in CNGB1, a gene coding for a signal transduction channel subunit expressed in rod photoreceptors and olfactory sensory neurons.

Methods : In a multicenter study involving four tertiary referral centers, nine patients with CNGB1-related retinitis pigmentosa were recruited to investigate olfactory function using the standardized Sniffin Sticks test battery consisting of tests for odor threshold, odor discrimination and odor identification. In one patient, the T&T olfactometer was used. The ocular phenotype was also investigated using multimodal imaging and electroretinography.

Results : All patients had an early onset of night blindness, but were usually not diagnosed before the fourth decade due to a relatively slow retinal degeneration. Retinal features were characteristic for a rod-cone dystrophy. Olfactory testing revealed decreased or absent olfactory function, with all except one patient scoring in the lowest quartile in relation to age-related norms. Magnetic resonance brain imaging and electroencephalography measurements in response to olfactory stimulation were available for one patient and revealed diminished olfactory bulbs and reduced responses to odor, respectively. Molecular genetic testing identified four previously reported and six novel (c.1312C>T, c.2210G>A, c.2492+1G>A, c.2542_2543insA, c.2763C>G, c.3044_3050delGGAAATC) mutations in CNGB1.

Conclusions : Mutations in CNGB1 may cause an autosomal recessive retinitis pigmentosa-olfactory dysfunction syndrome, characterized by a relatively slow progression of retinal degeneration and variable hyposmia/anosmia.

This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.

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