Ames Waltzer deaf mice have reduced electroretinogram amplitudes and complex alternative splicing of Pcdh15 transcripts

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Ames Waltzer deaf mice have reduced electroretinogram amplitudes and complex alternative splicing of Pcdh15 transcripts. / Haywood-Watson, Ricky J L; Ahmed, Zubair M; Kjellstrom, Sten; Bush, Ronald A; Takada, Yuichiro; Hampton, Lori L; Battey, James F; Sieving, Paul A.; Friedman, Thomas B.

In: Investigative Ophthalmology and Visual Science, Vol. 47, No. 7, 07.2006, p. 3074-84.

Research output: Contribution to journalArticle

Harvard

Haywood-Watson, RJL, Ahmed, ZM, Kjellstrom, S, Bush, RA, Takada, Y, Hampton, LL, Battey, JF, Sieving, PA & Friedman, TB 2006, 'Ames Waltzer deaf mice have reduced electroretinogram amplitudes and complex alternative splicing of Pcdh15 transcripts', Investigative Ophthalmology and Visual Science, vol. 47, no. 7, pp. 3074-84. https://doi.org/10.1167/iovs.06-0108

APA

Haywood-Watson, R. J. L., Ahmed, Z. M., Kjellstrom, S., Bush, R. A., Takada, Y., Hampton, L. L., ... Friedman, T. B. (2006). Ames Waltzer deaf mice have reduced electroretinogram amplitudes and complex alternative splicing of Pcdh15 transcripts. Investigative Ophthalmology and Visual Science, 47(7), 3074-84. https://doi.org/10.1167/iovs.06-0108

CBE

Haywood-Watson RJL, Ahmed ZM, Kjellstrom S, Bush RA, Takada Y, Hampton LL, Battey JF, Sieving PA, Friedman TB. 2006. Ames Waltzer deaf mice have reduced electroretinogram amplitudes and complex alternative splicing of Pcdh15 transcripts. Investigative Ophthalmology and Visual Science. 47(7):3074-84. https://doi.org/10.1167/iovs.06-0108

MLA

Vancouver

Author

Haywood-Watson, Ricky J L ; Ahmed, Zubair M ; Kjellstrom, Sten ; Bush, Ronald A ; Takada, Yuichiro ; Hampton, Lori L ; Battey, James F ; Sieving, Paul A. ; Friedman, Thomas B. / Ames Waltzer deaf mice have reduced electroretinogram amplitudes and complex alternative splicing of Pcdh15 transcripts. In: Investigative Ophthalmology and Visual Science. 2006 ; Vol. 47, No. 7. pp. 3074-84.

RIS

TY - JOUR

T1 - Ames Waltzer deaf mice have reduced electroretinogram amplitudes and complex alternative splicing of Pcdh15 transcripts

AU - Haywood-Watson, Ricky J L

AU - Ahmed, Zubair M

AU - Kjellstrom, Sten

AU - Bush, Ronald A

AU - Takada, Yuichiro

AU - Hampton, Lori L

AU - Battey, James F

AU - Sieving, Paul A.

AU - Friedman, Thomas B

PY - 2006/7

Y1 - 2006/7

N2 - PURPOSE: Mutations of PCDH15, the gene encoding protocadherin 15, cause either nonsyndromic deafness DFNB23 or Usher syndrome type 1F (USH1F) in humans and deafness with balance problems in Ames waltzer (av) mice. Persons with USH1 usually begin to exhibit signs of retinitis pigmentosa (RP) in early adolescence, but av mice are reported to have functional retinas. In this study, the auditory, visual and molecular biological phenotype of Pcdh15av-5J and Pcdh15av-Jfb mice is characterized, and their usefulness as animal models of USH1 is evaluated.METHODS: Hearing thresholds of mice between 6 and 10 weeks of age were measured by auditory brain stem response (ABR). Immunohistochemistry and histology were used to examine the effect of homozygosity of Pcdh15av-5J on stereocilia bundles of inner ear hair cells and on the photoreceptor cells of the retina. Scotopic and photopic Ganzfeld ERGs were recorded from homozygous Pcdh15av-5J and Pcdh15av-Jfb mice at different ages. Heterozygous littermates served as control subjects. Measurements of the width of the outer nuclear layer (ONL) and the length of rod photoreceptor outer segment (ROS) were made.RESULTS: Homozygous Pcdh15av-5J mice have profound hearing loss and disorganized stereocilia bundles of inner ear hair cells. Compared with heterozygous littermates, homozygous Pcdh15av-5J and Pcdh15av-Jfb mutant mice had scotopic ERG amplitudes consistently reduced by approximately 40% at all light intensities. The b-to-a-wave ratio confirmed that the a- and b-waves were reduced proportionally in homozygous mutant mice. Histologic measurements of retinal sections revealed no significant differences in either the ONL width or the ROS length as a function of genotype. The protocadherin 15 labeling pattern with antisera PB303 in the retina of both heterozygous and homozygous Pcdh15av-5J mice was indistinguishable from the wild type. Wild-type Pcdh15 have many alternatively spliced isoforms. A novel isoform was found in the retina of homozygous Pcdh15av-5J mice, which appears to circumvent the effect of the mutant allele (IVS14-2A-->G), which causes skipping of exon 14, a shift in the translation reading frame and a premature stop codon in exon 15.CONCLUSIONS: Pcdh15(av-5J) and Pcdh15(av-Jfb) mice do not faithfully mimic the RP found in USH1 due to mutations of PCDH15, but have significantly attenuated ERG function in the absence of histologic change. The decline in ERG amplitude with a preserved b-to-a-wave ratio suggests a role for Pcdh15 in retinal function and/or generation of the ERG potentials. Understanding the molecular mechanism by which av mice circumvent degeneration of the retina might offer insights into potential therapies for USH1.

AB - PURPOSE: Mutations of PCDH15, the gene encoding protocadherin 15, cause either nonsyndromic deafness DFNB23 or Usher syndrome type 1F (USH1F) in humans and deafness with balance problems in Ames waltzer (av) mice. Persons with USH1 usually begin to exhibit signs of retinitis pigmentosa (RP) in early adolescence, but av mice are reported to have functional retinas. In this study, the auditory, visual and molecular biological phenotype of Pcdh15av-5J and Pcdh15av-Jfb mice is characterized, and their usefulness as animal models of USH1 is evaluated.METHODS: Hearing thresholds of mice between 6 and 10 weeks of age were measured by auditory brain stem response (ABR). Immunohistochemistry and histology were used to examine the effect of homozygosity of Pcdh15av-5J on stereocilia bundles of inner ear hair cells and on the photoreceptor cells of the retina. Scotopic and photopic Ganzfeld ERGs were recorded from homozygous Pcdh15av-5J and Pcdh15av-Jfb mice at different ages. Heterozygous littermates served as control subjects. Measurements of the width of the outer nuclear layer (ONL) and the length of rod photoreceptor outer segment (ROS) were made.RESULTS: Homozygous Pcdh15av-5J mice have profound hearing loss and disorganized stereocilia bundles of inner ear hair cells. Compared with heterozygous littermates, homozygous Pcdh15av-5J and Pcdh15av-Jfb mutant mice had scotopic ERG amplitudes consistently reduced by approximately 40% at all light intensities. The b-to-a-wave ratio confirmed that the a- and b-waves were reduced proportionally in homozygous mutant mice. Histologic measurements of retinal sections revealed no significant differences in either the ONL width or the ROS length as a function of genotype. The protocadherin 15 labeling pattern with antisera PB303 in the retina of both heterozygous and homozygous Pcdh15av-5J mice was indistinguishable from the wild type. Wild-type Pcdh15 have many alternatively spliced isoforms. A novel isoform was found in the retina of homozygous Pcdh15av-5J mice, which appears to circumvent the effect of the mutant allele (IVS14-2A-->G), which causes skipping of exon 14, a shift in the translation reading frame and a premature stop codon in exon 15.CONCLUSIONS: Pcdh15(av-5J) and Pcdh15(av-Jfb) mice do not faithfully mimic the RP found in USH1 due to mutations of PCDH15, but have significantly attenuated ERG function in the absence of histologic change. The decline in ERG amplitude with a preserved b-to-a-wave ratio suggests a role for Pcdh15 in retinal function and/or generation of the ERG potentials. Understanding the molecular mechanism by which av mice circumvent degeneration of the retina might offer insights into potential therapies for USH1.

KW - Alternative Splicing

KW - Animals

KW - Auditory Threshold

KW - Cadherins

KW - Deafness

KW - Disease Models, Animal

KW - Electroretinography

KW - Evoked Potentials, Auditory, Brain Stem

KW - Female

KW - Hair Cells, Auditory, Inner

KW - Immunohistochemistry

KW - Mice

KW - Mice, Inbred C57BL

KW - Mutation

KW - Phenotype

KW - Photoreceptor Cells, Vertebrate

KW - Protein Precursors

KW - Retina

KW - Retinitis Pigmentosa

KW - Reverse Transcriptase Polymerase Chain Reaction

KW - Vestibular Diseases

KW - Journal Article

KW - Research Support, N.I.H., Intramural

U2 - 10.1167/iovs.06-0108

DO - 10.1167/iovs.06-0108

M3 - Article

VL - 47

SP - 3074

EP - 3084

JO - Investigative Ophthalmology & Visual Science

T2 - Investigative Ophthalmology & Visual Science

JF - Investigative Ophthalmology & Visual Science

SN - 1552-5783

IS - 7

ER -