Abstract:
BACKGROUND:A 28-year-old woman of Lebanese origin experienced two stillbirths. At the time, serology typed her red blood cells as being group A D- and found an anti-D in her serum sample. Molecular biology analysis, however, showed that she was in fact RHD+. STUDY DESIGN AND METHODS:To better characterize this case, a full investigation including family members was undertaken. Classical serology techniques and DNA and RNA analysis were performed whenever possible. RESULTS:Serology results showed that the patient's father and two brothers were D-. RHD genotyping demonstrated that her two brothers were indeed RHD+. Polymerase chain reaction (PCR) amplification was performed on each RHD 10 exons. Exon 8 did not amplify for the patient, her father, and her two brothers. Her mother and sister had exon 8. Messenger RNA analysis showed five RHD transcripts. The longest transcript was missing exon 8 but had a part of intron 7 inserted instead. Genomic DNA sequencing revealed a 995-bp deletion including part of intron 7, exon 8, and intron 8. This mutation, RHD(delEx8), was found to express a DEL in adsorption-elution. To facilitate the screening of this new DEL allele, a simple PCR-based assay was designed. CONCLUSION:This novel allele represents the first observation of a large deletion at the genomic level within the RHD gene in Caucasian persons.
journal_name
Transfusionjournal_title
Transfusionauthors
Richard M,Perreault J,Constanzo-Yanez J,Khalifé S,St-Louis Mdoi
10.1111/j.1537-2995.2007.01199.xsubject
Has Abstractpub_date
2007-05-01 00:00:00pages
852-7issue
5eissn
0041-1132issn
1537-2995pii
TRF01199journal_volume
47pub_type
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