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The human basonuclin 2 gene has the potential to generate nearly 90,000 mRNA isoforms encoding over 2000 different proteins
- Source :
- Genomics / Physiol Genomics, Genomics / Physiol Genomics, 2007, 89 (1), pp.44-58. ⟨10.1016/j.ygeno.2006.07.006⟩
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- The number of mRNAs and proteins that can be produced from a single gene is known to be increased by the number of start sites and by multiple splicing of products. A few genes have been found to generate extraordinarily large numbers of splicing isoforms. In the human, the largest number, nearly 2000 mRNA isoforms, has been reported for the neurexin 3α gene. However, the biological significance of alternative splicing often remains unclear because many alternative transcripts contain early translational stops and are thought to be rapidly degraded. We demonstrate here that human basonuclin 2 (bn2; approved gene symbol BNC2) transcripts are initiated from six promoters, are alternatively spliced at multiple positions, and are polyadenylated at four sites. Characterization of nearly 100 bn2 mRNA isoforms suggests that each promoter, splice site, and poly(A) addition site is used independently. The bn2 gene has therefore the potential to generate up to 90,000 mRNA isoforms encoding more than 2000 different proteins. Because alternative exons affect the position of the first methionine codon, the length of the coding region, and the position of the translational stop, the encoded proteins range in size from 43 to 1211 amino acids and some bear no sequence similarity to others. PCR analysis and transient expression in HeLa cells show that the major bn2 mRNA isoforms are stable and are translated into equally stable proteins, even when the mRNA bears an early translational stop.
- Subjects :
- Polyadenylation
MESH: Sequence Homology, Amino Acid
Nuclear Localization Signals
MESH: Nuclear Localization Signals
MESH: Amino Acid Sequence
MESH: Protein Isoforms
MESH: Base Sequence
Mice
Exon
0302 clinical medicine
Protein Isoforms
Coding region
MESH: Animals
Promoter Regions, Genetic
MESH: CpG Islands
Genetics
0303 health sciences
MESH: Alternative Splicing
Zinc Fingers
Exons
MESH: Transcription Factors
TATA Box
MESH: Polyadenylation
DNA-Binding Proteins
MESH: Promoter Regions (Genetics)
030220 oncology & carcinogenesis
MESH: Protein Biosynthesis
RNA splicing
Gene isoform
Molecular Sequence Data
MESH: TATA Box
Biology
MESH: Sequence Homology, Nucleic Acid
03 medical and health sciences
Species Specificity
Basonuclin 2
Sequence Homology, Nucleic Acid
Animals
Humans
MESH: Species Specificity
MESH: Zinc Fingers
[SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology
Amino Acid Sequence
RNA, Messenger
Gene
MESH: Mice
030304 developmental biology
MESH: RNA, Messenger
Messenger RNA
MESH: Molecular Sequence Data
MESH: Humans
Base Sequence
Sequence Homology, Amino Acid
Alternative splicing
MESH: Hela Cells
Alternative Splicing
Protein Biosynthesis
CpG Islands
MESH: Exons
MESH: DNA-Binding Proteins
HeLa Cells
Transcription Factors
Subjects
Details
- ISSN :
- 08887543
- Volume :
- 89
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Genomics
- Accession number :
- edsair.doi.dedup.....d7febe8c9304a80e2ca9784c95f08912
- Full Text :
- https://doi.org/10.1016/j.ygeno.2006.07.006