Abnormal splicing of hepatocyte nuclear factor-1 beta in the renal cysts and diabetes syndrome.
OBJECTIVE
Mutations in the hepatocyte nuclear factor-1 beta ( HNF-1 beta) gene result in disorders of renal development, typically involving renal cysts and early-onset diabetes (the RCAD syndrome/ MODY5). Sixteen mutations have been reported, including three splicing mutations of the intron 2 splice donor site. Because tissues showing abundant expression (kidney, liver, pancreas, gut, lung and gonads) are not easily accessible for analysis in living subjects, it has previously proven difficult to determine the effect of HNF-1 beta mutations at the mRNA level. This is the aim of the present study.


METHODS
We have developed a nested RT-PCR assay that exploits the presence of ectopic HNF-1 beta transcripts in Epstein-Barr virus (EBV)-transformed lymphoblastoid cell lines derived from subjects carrying HNF-1 beta splice site mutations.


RESULTS
We report a fourth mutation of the intron 2 splice donor site, IVS2nt+2insT. Sequence analysis of ectopic HNF-1 beta transcripts showed that both IVS2nt+2insT and IVS2nt+1G>T result in the deletion of exon 2 and are predicted to result in premature termination of the HNF-1 beta protein. Mutant transcripts were less abundant than the normal transcripts but there was no evidence of nonsense-mediated decay.


CONCLUSIONS
This is the first study to define the pathogenic consequences of mutations within the HNF-1 beta gene by mRNA analysis. This type of approach is a useful and important tool to define mutational mechanisms and determine pathogenicity.
Harries
L W
LW
Molecular Genetics, Institute of Biomedical and Clinical Science, Peninsula Medical School, Exeter, UK.
Ellard
S
S
Jones
R W A
RW
Hattersley
A T
AT
Bingham
C
C
D017398:Alternative Splicing / Q000235:genetics*; D001483:Base Sequence; D017931:DNA Primers; D004268:DNA-Binding Proteins / Q000235:genetics*; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics*; D005260:Female; D051539:Hepatocyte Nuclear Factor 1-beta; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000235:genetics*; D008297:Male; D010375:Pedigree; D012333:RNA, Messenger / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic / Q000235:genetics
D017931:DNA Primers; D004268:DNA-Binding Proteins; C496495:HNF1B protein, human; D012333:RNA, Messenger; D014157:Transcription Factors; D051539:Hepatocyte Nuclear Factor 1-beta