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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Quantifying and Localizing the Mitochondrial Proteome Across Five Tissues in A Mouse Population.

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Protein and transcript levels in mouse tissues show varied correlation, with higher concordance in highly expressed genes. This proteomic study reveals tissue-specific gene networks and identifies novel mitochondrial proteins, highlighting multi-omics benefits.

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Area of Science:

  • Proteomics
  • Genomics
  • Systems Biology
  • Mouse Models

Background:

  • Gene and protein expression covariation is crucial for understanding cellular function.
  • Previous studies have often relied on transcriptomics, potentially missing proteomic nuances.
  • Genetically diverse mouse models offer valuable insights into biological variability.

Purpose of the Study:

  • To quantify protein expression across multiple tissues and genetic strains using SWATH mass spectrometry.
  • To investigate the correlation between protein and transcript levels in different cellular fractions.
  • To identify novel mitochondrial proteins and characterize tissue-specific gene networks.

Main Methods:

  • SWATH mass spectrometry for quantitative proteomic analysis.
  • Analysis of 76 proteomes from BXD mouse strains across five tissues (liver, quadriceps, heart, brain, BAT).
  • Comparison of protein and transcript covariation in total cell and mitochondrial fractions.

Main Results:

  • Broad alignment between protein and transcript expression, with stronger covariation in highly expressed genes.
  • Tissue-specific gene networks observed for electron transport chain (ETC) proteins, not transcripts.
  • Identification of several hundred proteins enriched in mitochondria, including novel candidates validated biochemically (MTAP, SOAT2, IMPDH2, ABCC6).

Conclusions:

  • Multi-omics approaches reveal complex metabolic processes and gene regulatory mechanisms.
  • Transcript data alone can obscure important physiological differences, such as ATP synthase depletion in brown adipose tissue.
  • This study provides a valuable proteomic resource for future research on proteoforms, protein modifications, and localization.