Additional organizational features of the murine γ-glutamyl hydrolase gene - Two remotely situated exons within the complement C3 gene locus encode an alternate 5′ end and proximal ORF under the control of a bidirectional promoter Journal Article
| Authors: | Masumoto, N.; Esaki, T.; Sirotnak, F. M. |
| Article Title: | Additional organizational features of the murine γ-glutamyl hydrolase gene - Two remotely situated exons within the complement C3 gene locus encode an alternate 5′ end and proximal ORF under the control of a bidirectional promoter |
| Abstract: | Analysis of independently isolated clones from a mouse liver cDNA library identified a splice variant of γ-GH mRNA with novel nucleotide sequence at the 5′ end. Genomic sequencing now shows that this variant (variant II) incorporates two new alternates (exons Bla and Blb) of exon 1 in the murine γ-GH gene remotely situated with respect to the rest of the gene. Further analysis of this variant also showed that it incorporates a small segment at the 3′ end of exon A1, revealing that the previously described exon 1 consists of two individual exons (Ala and Alb) joined at a cryptic splice site. The 5′ UTR and a segment of the ORF of variant II results from splicing of exon Bla to exon Blb which in turn is spliced to exon Alb and through this splicing to the rest of the exons within this gene. Remarkably, this splicing occurs even though exons Bla and Blb are located >45 Kb upstream of exons Ala and Alb. Our results also show that transcription starting at exons Bla and Blb is under the control of a separate and bidirectional promoter (promoter B). Exons Bla and Blb are located on the sense DNA strand within the complement C3 gene locus which is encoded on the antisense strand. This promoter is less efficient than the downstream promoter (promoter A) in regulating transcription at least in the context of reporter gene and primer extension assays. However, in these same contexts, this region of DNA sequence in the reverse orientation is markedly more efficient in driving transcription of an unidentified gene. Deletion of specific regions of sequence within this promoter have different effects depending upon the orientation (forward or reverse) within the reporter gene construct. © 2001 Elsevier Science B.V. |
| Keywords: | controlled study; promoter region; exon; exons; nonhuman; genetic analysis; mouse; animals; mice; animal tissue; animal experiment; gene locus; transcription, genetic; gene library; liver; transcription regulation; amino acid sequence; molecular sequence data; lung; organ specificity; alternative splicing; base sequence; dna sequence; salivary glands; clone; open reading frame; dna strand; gamma-glutamyl hydrolase; promoter regions (genetics); gamma glutamyl hydrolase; untranslated region; gene order; complement c3; priority journal; article; dual transcriptional control regions |
| Journal Title: | Gene |
| Volume: | 268 |
| Issue: | 1-2 |
| ISSN: | 0378-1119 |
| Publisher: | Elsevier Science, Inc. |
| Date Published: | 2001-05-02 |
| Start Page: | 183 |
| End Page: | 194 |
| Language: | English |
| DOI: | 10.1016/s0378-1119(01)00411-5 |
| PUBMED: | 11368914 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | Export Date: 21 May 2015 -- Source: Scopus |
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