RGD Reference Report - Novel mutations in the long isoform of the USH2A gene in patients with Usher syndrome type II or non-syndromic retinitis pigmentosa. - Rat Genome Database

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Novel mutations in the long isoform of the USH2A gene in patients with Usher syndrome type II or non-syndromic retinitis pigmentosa.

Authors: McGee, TL  Seyedahmadi, BJ  Sweeney, MO  Dryja, TP  Berson, EL 
Citation: McGee TL, etal., J Med Genet. 2010 Jul;47(7):499-506. doi: 10.1136/jmg.2009.075143. Epub 2010 May 27.
RGD ID: 8547966
Pubmed: PMID:20507924   (View Abstract at PubMed)
PMCID: PMC3070405   (View Article at PubMed Central)
DOI: DOI:10.1136/jmg.2009.075143   (Journal Full-text)

BACKGROUND: Usher syndrome type II (USH2) is an autosomal recessive disorder characterised by retinitis pigmentosa (RP) and mild to moderate sensorineural hearing loss. Mutations in the USH2A gene are the most common cause of USH2 and are also a cause of some forms of RP without hearing loss (ie, non-syndromic RP). The USH2A gene was initially identified as a transcript comprised of 21 exons but subsequently a longer isoform containing 72 exons was identified. METHODS: The 51 exons unique to the long isoform of USH2A were screened for mutations among a core set of 108 patients diagnosed with USH2 and 80 patients with non-syndromic RP who were all included in a previously reported screen of the short isoform of USH2A. For several exons, additional patients were screened. RESULTS: In total, 35 deleterious mutations were identified including 17 nonsense mutations, 9 frameshift mutations, 5 splice-site mutations, and 4 small in-frame deletions or insertions. Twenty-seven mutations were novel. In addition, 65 rare missense changes were identified. A method of classifying the deleterious effect of the missense changes was developed using the summed results of four different mutation assessment algorithms, SIFT, pMUT, PolyPhen, and AGVGD. This system classified 8 of the 65 changes as 'likely deleterious' and 9 as 'possibly deleterious'. CONCLUSION: At least one mutation was identified in 57-63% of USH2 cases and 19-23% of cases of non-syndromic recessive RP (calculated without and including probable/possible deleterious changes) thus supporting that USH2A is the most common known cause of RP in the USA.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
retinitis pigmentosa susceptibilityIAGP 8547966DNA:snps more ...RGD 
retinitis pigmentosa susceptibilityISOUSH2A (Homo sapiens)8547966; 8547966DNA:snps more ...RGD 

Objects Annotated

Genes (Rattus norvegicus)
Ush2a  (usherin)

Genes (Mus musculus)
Ush2a  (usherin)

Genes (Homo sapiens)
USH2A  (usherin)


Additional Information