Abstract:
:We report here that a defect of the interleukin common gamma subunit (gamma c) in X-linked severe combined immunodeficiency (XSCID) previously known as a missense mutation resulted instead in exon skipping in a Japanese XSCID patient. The phenotype of the patient was consistent with that of typical XSCID, and his Epstein-Barr virus-transformed B cells accordingly entirely lacked surface expression of gamma c . On analysis by the reverse transcription-polymerase chain reaction (RT-PCR), a single but small gamma c mRNA species was detected. Exon 6, which encodes the transmembrane domain of gamma c, was skipped in the mRNA. A G to A mutation was found at the last nucleotide of exon 6 of the gamma c gene (868G-->A). The predicted consequence of the exon skipping is a frameshift resulting in a premature stop codon, and the mutated gamma c presumably loses association with the cell membrane. In XSCID, this mutation (868G-->A) is known as a missense mutation that results in R285Q [corrected]. Previously reported patients with the same mutation apparently had no aberrant or alternative splicing but did have the R285Q [corrected] exchange. Similar mutations at the last nucleotide of an outskipped exon have been reported. However, such mutations do not always cause exon skipping. Analyses of RNA structural changes induced by the mutations supported the variability of consequences of the mutations. Taken together, our findings suggest that the 868G-->A mutation of the gamma c gene may affect gamma c transcripts differently, i.e., generating missense or exon skipping, in XSCID patients with the same mutation. Patient-specific variation in splicing thus appears to occur.
journal_name
Hum Genetjournal_title
Human geneticsauthors
Kanai N,Yanai F,Hirose S,Nibu K,Izuhara K,Tani T,Kubota T,Mitsudome Adoi
10.1007/s004390050907keywords:
subject
Has Abstractpub_date
1999-01-01 00:00:00pages
36-42issue
1eissn
0340-6717issn
1432-1203journal_volume
104pub_type
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