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Updated: Jun 18, 2026
An Integrated Approach for Microprotein Identification and Sequence Analysis
Published on: July 12, 2022
Prediction of novel isoforms of the mouse Mpv17l protein
Charalambos Magoulas1, Avin Jasim, Luis Lopez de Heredia
1Neuroscience Centre, Institute of Cell and Molecular Science, Barts and The London School of Medicine and Dentistry, Queen Mary, University of London, 4 Newark Street, Whitechapel, London E1 2AT, United Kingdom. c.b.magoulas@qmul.ac.uk
Abstract:
The Mpv17l protein has two isoforms, M-LPL and M-LPS, which both regulate the production of reactive oxygen species (ROS) and protect against mitochondrial oxidative stress and apoptosis. M-LPL is ubiquitously expressed, while M-LPS is expressed mostly in the kidney of aged animals. We identified a variety of transcripts of the Mpv17l gene that could encode novel isoforms by mapping expressed sequence tags on the mouse M-LP genomic locus. We analysed the expression and evolutionary conservation of a novel Mpv17l transcript (mpv17l-002) that is predicted to encode a new protein, termed M-LP2. The isoform M-LP2 has the full length of M-LPS plus six amino acids at the end of its amino terminus, which could be encoded by an alternative 5'-flanking sequence. We show that the mRNA of M-LP2 has a different pattern of expression than the mRNA of M-LPS, and sequences of both transcripts are conserved in the rodent genome; however, neither of these isoforms is detected in the human genome. These observations suggest that the functions of certain M-LP isoforms are tissue- and species-specific, implying that their potential involvement in ROS metabolism may be redundant or may be complemented by other members of the Mpv17 family.
Insights
Researchers discovered a new Mpv17l protein isoform, M-LP2, involved in regulating reactive oxygen species (ROS). This novel isoform exhibits species-specific expression, suggesting varied roles in ROS metabolism across different organisms.
Area of Science:
- Mitochondrial biology
- Molecular genetics
- Biochemistry
Background:
- The Mpv17l protein exists in two isoforms, M-LPL and M-LPS, which modulate reactive oxygen species (ROS) production and protect against oxidative stress and apoptosis.
- M-LPL exhibits ubiquitous expression, whereas M-LPS is primarily found in the kidneys of aged animals.
Purpose of the Study:
- To identify and characterize novel Mpv17l gene transcripts and their encoded protein isoforms.
- To investigate the expression patterns and evolutionary conservation of a newly identified Mpv17l transcript, mpv17l-002, predicted to encode the M-LP2 isoform.
Main Methods:
- Expressed sequence tag (EST) mapping to the mouse M-LP genomic locus to identify novel transcripts.
- Analysis of mRNA expression patterns for M-LP2 and M-LPS.
- Comparative sequence analysis to assess evolutionary conservation in the rodent and human genomes.
Main Results:
- A novel Mpv17l transcript (mpv17l-002) was identified, predicted to encode a new isoform, M-LP2.
- M-LP2 possesses an extended N-terminus compared to M-LPS, potentially due to alternative 5'-flanking sequence usage.
- M-LP2 mRNA displays a distinct expression profile compared to M-LPS mRNA.
- While both M-LP2 and M-LPS transcripts are conserved in rodents, they are not detected in the human genome.
Conclusions:
- The Mpv17l gene encodes a novel isoform, M-LP2, with unique expression characteristics.
- The tissue- and species-specific expression of M-LP isoforms suggests functional diversification and potential redundancy or complementation by other Mpv17 family members in ROS metabolism.
