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Heterogeneity at the 5'-end of MEN1 transcripts
S Khodaei-O'Brien1, B Zablewska, M Fromaget
1Department of Molecular Medicine, CMM L8-02, Karolinska Institute, Stockholm, S-171 76, Sweden. shideh.Khodaei@cmm.ki.se
Abstract:
Multiple endocrine neoplasia type 1 is an autosomal dominant familial cancer syndrome. The responsible gene, MEN1, has been isolated and inactivating mutations have been found in the majority of MEN1 families. The underlying genetic defects in the remaining families may be located in yet unidentified regions of the MEN1 gene. Here, we present novel transcripts of MEN1 which vary in the content of their 5'-untranslated region. All transcript variants display upstream exons correctly spliced to MEN1 exon 2. The most commonly seen splice isoform occurred in a region previously published as human intron 1, a region which shows a high conservation between human and rodent MEN1. This splice variant uses an analogous transcription initiation site and identical splice donor/acceptor sites as a major transcript seen in rodent Men1. The newly identified MEN1 isoforms may represent biologically important transcripts and should thus be studied for mutations in the regions enclosed therein.
Insights
Researchers identified new Multiple Endocrine Neoplasia type 1 (MEN1) gene transcripts with varying 5'-untranslated regions. These novel MEN1 isoforms may harbor genetic defects in familial cancer syndromes.
Area of Science:
- Genetics
- Molecular Biology
- Oncology
Background:
- Multiple Endocrine Neoplasia type 1 (MEN1) is an autosomal dominant familial cancer syndrome.
- The MEN1 gene has been identified, and inactivating mutations explain most familial cases.
- Genetic defects in some MEN1 families remain unexplained, suggesting undiscovered gene regions or variants.
Purpose of the Study:
- To identify novel transcripts of the MEN1 gene.
- To investigate variations in the 5'-untranslated region (5'-UTR) of MEN1 transcripts.
- To explore potential mutation sites within newly identified MEN1 isoforms for unexplained familial cases.
Main Methods:
- Analysis of gene transcripts using molecular biology techniques.
- Comparison of human MEN1 splice variants with rodent Men1 transcripts.
- Identification and characterization of novel MEN1 isoforms and their splice junctions.
Main Results:
- Discovery of novel MEN1 transcripts with diverse 5'-UTR content.
- Identification of a common splice isoform within a conserved region homologous to human intron 1.
- Demonstration that this variant utilizes similar transcription initiation and splice sites as a major rodent Men1 transcript.
Conclusions:
- The newly identified MEN1 isoforms represent potentially biologically significant transcripts.
- These novel isoforms, particularly those in the conserved intron 1 region, warrant investigation for mutations in MEN1 families.
- Further study of these MEN1 variants may elucidate the genetic basis of familial cancer syndromes in previously unexplained cases.