Mutation analysis in the long isoform of USH2A in American patients with Usher Syndrome type II

Denise Yan, Xiaomei Ouyang, D. Michael Patterson, Li Lin Du, Samuel G. Jacobson, Xue Z Liu

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Usher syndrome type II (USH2) is an autosomal recessive disorder characterized by moderate to severe hearing impairment and progressive visual loss due to retinitis pigmentosa (RP). To identify novel mutations and determine the frequency of USH2A mutations as a cause of USH2, we have carried out mutation screening of all 72 coding exons and exon-intron splice sites of the USH2A gene. A total of 20 USH2 American probands of European descent were analyzed using single strand conformational polymorphism (SSCP) and direct sequencing methods. Ten different USH2A mutations were identified in 55% of the probands, five of which were novel mutations. The detected mutations include three missense, three frameshifts and four nonsense mutations, with c.2299delG/p.E767fs mutation, accounting for 38.9% of the pathological alleles. Two cases were homozygotes, two cases were compound heterozygotes and one case had complex allele with three variants. In seven probands, only one USH2A mutation was detected and no pathological mutation was found in the remaining eight individuals. Altogether, our data support the fact that c.2299delG/p.E767fs is indeed the most common USH2A mutation found in USH2 patients of European Caucasian background. Thus, if screening for mutations in USH2A is considered, it is reasonable to screen for the c.2299delG mutation first.

Original languageEnglish
Pages (from-to)732-738
Number of pages7
JournalJournal of Human Genetics
Volume54
Issue number12
DOIs
StatePublished - Dec 1 2009

Fingerprint

Usher Syndromes
Protein Isoforms
Mutation
Exons
Alleles
Retinitis Pigmentosa
Nonsense Codon
Homozygote
Mutation Rate
Heterozygote
Hearing Loss
Introns

Keywords

  • Mutations
  • USH2
  • USH2A
  • Usher syndrome
  • Usherin

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

Cite this

Mutation analysis in the long isoform of USH2A in American patients with Usher Syndrome type II. / Yan, Denise; Ouyang, Xiaomei; Patterson, D. Michael; Du, Li Lin; Jacobson, Samuel G.; Liu, Xue Z.

In: Journal of Human Genetics, Vol. 54, No. 12, 01.12.2009, p. 732-738.

Research output: Contribution to journalArticle

Yan, Denise ; Ouyang, Xiaomei ; Patterson, D. Michael ; Du, Li Lin ; Jacobson, Samuel G. ; Liu, Xue Z. / Mutation analysis in the long isoform of USH2A in American patients with Usher Syndrome type II. In: Journal of Human Genetics. 2009 ; Vol. 54, No. 12. pp. 732-738.
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abstract = "Usher syndrome type II (USH2) is an autosomal recessive disorder characterized by moderate to severe hearing impairment and progressive visual loss due to retinitis pigmentosa (RP). To identify novel mutations and determine the frequency of USH2A mutations as a cause of USH2, we have carried out mutation screening of all 72 coding exons and exon-intron splice sites of the USH2A gene. A total of 20 USH2 American probands of European descent were analyzed using single strand conformational polymorphism (SSCP) and direct sequencing methods. Ten different USH2A mutations were identified in 55{\%} of the probands, five of which were novel mutations. The detected mutations include three missense, three frameshifts and four nonsense mutations, with c.2299delG/p.E767fs mutation, accounting for 38.9{\%} of the pathological alleles. Two cases were homozygotes, two cases were compound heterozygotes and one case had complex allele with three variants. In seven probands, only one USH2A mutation was detected and no pathological mutation was found in the remaining eight individuals. Altogether, our data support the fact that c.2299delG/p.E767fs is indeed the most common USH2A mutation found in USH2 patients of European Caucasian background. Thus, if screening for mutations in USH2A is considered, it is reasonable to screen for the c.2299delG mutation first.",
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