Usher syndrome in Denmark: mutation spectrum and some clinical observations

Dad Shzeena; Nanna Dahl Rendtorff; Lisbeth Tranebjærg; Karen Grønskov; Helena Gásdal Karstensen; Vigdis Brox; Øivind Nilssen; Anne-Françoise Roux; Thomas Rosenberg; Hanne Jensen; Lisbeth Birk Møller

doi:10.1002/mgg3.228

Usher syndrome in Denmark: mutation spectrum and some clinical observations

Dad Shzeena, Nanna Dahl Rendtorff, Lisbeth Tranebjærg, Karen Grønskov, Helena Gásdal Karstensen, Vigdis Brox, Øivind Nilssen, Anne-Françoise Roux, Thomas Rosenberg, Hanne Jensen, Lisbeth Birk Møller

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Abstract

BACKGROUND: Usher syndrome (USH) is a genetically heterogeneous deafness-blindness syndrome, divided into three clinical subtypes: USH1, USH2 and USH3.

METHODS: Mutations in 21 out of 26 investigated Danish unrelated individuals with USH were identified, using a combination of molecular diagnostic methods.

RESULTS: Before Next Generation Sequencing (NGS) became available mutations in nine individuals (1 USH1, 7 USH2, 1 USH3) were identified by Sanger sequencing of USH1C,USH2A or CLRN1 or by Arrayed Primer EXtension (APEX) method. Mutations in 12 individuals (7 USH1, 5 USH2) were found by targeted NGS of ten known USH genes. Five novel pathogenic variants were identified. We combined our data with previously published, and obtained an overview of the USH mutation spectrum in Denmark, including 100 unrelated individuals; 32 with USH1, 67 with USH2, and 1 with USH3. Macular edema was observed in 44 of 117 individuals. Olfactory function was tested in 12 individuals and found to be within normal range in all.

CONCLUSION: Mutations that lead to USH1 were predominantly identified in MYO7A (75%), whereas all mutations in USH2 cases were identified in USH2A. The MYO7A mutation c.93C>A, p.(Cys31*) accounted for 33% of all USH1 mutations and the USH2A c.2299delG, p.(Glu767Serfs*21) variant accounted for 45% of all USH2 mutations in the Danish cohort.

Original language	English
Journal	Molecular Genetics & Genomic Medicine
Volume	4
Issue number	5
Pages (from-to)	527-539
Number of pages	13
ISSN	2324-9269
DOIs	https://doi.org/10.1002/mgg3.228
Publication status	Published - 1 Sept 2016

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Usher syndrom e in Denmark: mutation spectrum and someclinical observationsFinal published version, 303 KBLicence: CC BY

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@article{fb944d80285a4ca79f97f96024014bc5,

title = "Usher syndrome in Denmark: mutation spectrum and some clinical observations",

abstract = "BACKGROUND: Usher syndrome (USH) is a genetically heterogeneous deafness-blindness syndrome, divided into three clinical subtypes: USH1, USH2 and USH3.METHODS: Mutations in 21 out of 26 investigated Danish unrelated individuals with USH were identified, using a combination of molecular diagnostic methods.RESULTS: Before Next Generation Sequencing (NGS) became available mutations in nine individuals (1 USH1, 7 USH2, 1 USH3) were identified by Sanger sequencing of USH1C,USH2A or CLRN1 or by Arrayed Primer EXtension (APEX) method. Mutations in 12 individuals (7 USH1, 5 USH2) were found by targeted NGS of ten known USH genes. Five novel pathogenic variants were identified. We combined our data with previously published, and obtained an overview of the USH mutation spectrum in Denmark, including 100 unrelated individuals; 32 with USH1, 67 with USH2, and 1 with USH3. Macular edema was observed in 44 of 117 individuals. Olfactory function was tested in 12 individuals and found to be within normal range in all.CONCLUSION: Mutations that lead to USH1 were predominantly identified in MYO7A (75%), whereas all mutations in USH2 cases were identified in USH2A. The MYO7A mutation c.93C>A, p.(Cys31*) accounted for 33% of all USH1 mutations and the USH2A c.2299delG, p.(Glu767Serfs*21) variant accounted for 45% of all USH2 mutations in the Danish cohort.",

author = "Dad Shzeena and Rendtorff, {Nanna Dahl} and Lisbeth Tranebj{\ae}rg and Karen Gr{\o}nskov and Karstensen, {Helena G{\'a}sdal} and Vigdis Brox and {\O}ivind Nilssen and Anne-Fran{\c c}oise Roux and Thomas Rosenberg and Hanne Jensen and M{\o}ller, {Lisbeth Birk}",

year = "2016",

month = sep,

day = "1",

doi = "10.1002/mgg3.228",

language = "English",

volume = "4",

pages = "527--539",

journal = "Molecular Genetics & Genomic Medicine",

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TY - JOUR

T1 - Usher syndrome in Denmark

T2 - mutation spectrum and some clinical observations

AU - Shzeena, Dad

AU - Rendtorff, Nanna Dahl

AU - Tranebjærg, Lisbeth

AU - Grønskov, Karen

AU - Karstensen, Helena Gásdal

AU - Brox, Vigdis

AU - Nilssen, Øivind

AU - Roux, Anne-Françoise

AU - Rosenberg, Thomas

AU - Jensen, Hanne

AU - Møller, Lisbeth Birk

PY - 2016/9/1

Y1 - 2016/9/1

N2 - BACKGROUND: Usher syndrome (USH) is a genetically heterogeneous deafness-blindness syndrome, divided into three clinical subtypes: USH1, USH2 and USH3.METHODS: Mutations in 21 out of 26 investigated Danish unrelated individuals with USH were identified, using a combination of molecular diagnostic methods.RESULTS: Before Next Generation Sequencing (NGS) became available mutations in nine individuals (1 USH1, 7 USH2, 1 USH3) were identified by Sanger sequencing of USH1C,USH2A or CLRN1 or by Arrayed Primer EXtension (APEX) method. Mutations in 12 individuals (7 USH1, 5 USH2) were found by targeted NGS of ten known USH genes. Five novel pathogenic variants were identified. We combined our data with previously published, and obtained an overview of the USH mutation spectrum in Denmark, including 100 unrelated individuals; 32 with USH1, 67 with USH2, and 1 with USH3. Macular edema was observed in 44 of 117 individuals. Olfactory function was tested in 12 individuals and found to be within normal range in all.CONCLUSION: Mutations that lead to USH1 were predominantly identified in MYO7A (75%), whereas all mutations in USH2 cases were identified in USH2A. The MYO7A mutation c.93C>A, p.(Cys31*) accounted for 33% of all USH1 mutations and the USH2A c.2299delG, p.(Glu767Serfs*21) variant accounted for 45% of all USH2 mutations in the Danish cohort.

AB - BACKGROUND: Usher syndrome (USH) is a genetically heterogeneous deafness-blindness syndrome, divided into three clinical subtypes: USH1, USH2 and USH3.METHODS: Mutations in 21 out of 26 investigated Danish unrelated individuals with USH were identified, using a combination of molecular diagnostic methods.RESULTS: Before Next Generation Sequencing (NGS) became available mutations in nine individuals (1 USH1, 7 USH2, 1 USH3) were identified by Sanger sequencing of USH1C,USH2A or CLRN1 or by Arrayed Primer EXtension (APEX) method. Mutations in 12 individuals (7 USH1, 5 USH2) were found by targeted NGS of ten known USH genes. Five novel pathogenic variants were identified. We combined our data with previously published, and obtained an overview of the USH mutation spectrum in Denmark, including 100 unrelated individuals; 32 with USH1, 67 with USH2, and 1 with USH3. Macular edema was observed in 44 of 117 individuals. Olfactory function was tested in 12 individuals and found to be within normal range in all.CONCLUSION: Mutations that lead to USH1 were predominantly identified in MYO7A (75%), whereas all mutations in USH2 cases were identified in USH2A. The MYO7A mutation c.93C>A, p.(Cys31*) accounted for 33% of all USH1 mutations and the USH2A c.2299delG, p.(Glu767Serfs*21) variant accounted for 45% of all USH2 mutations in the Danish cohort.

U2 - 10.1002/mgg3.228

DO - 10.1002/mgg3.228

M3 - Journal article

C2 - 27957503

SN - 2324-9269

VL - 4

SP - 527

EP - 539

JO - Molecular Genetics & Genomic Medicine

JF - Molecular Genetics & Genomic Medicine

IS - 5

ER -

Usher syndrome in Denmark: mutation spectrum and some clinical observations

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