Human saliva proteome and transcriptome

Area of Science:

• Biochemistry
• Molecular Biology
• Genomics

Background:

• Human whole saliva contains a complex mixture of proteins and nucleic acids.
• Understanding the relationship between salivary proteins and their corresponding genetic material (mRNA) is crucial for diagnostics and understanding oral biology.

Purpose of the Study:

• To test the hypothesis that salivary proteins and their counterpart mRNAs co-exist in human whole saliva.
• To investigate the correlation between the salivary proteome and transcriptome.

Main Methods:

• Global proteomic profiling of saliva using mass spectrometry (MS).
• Global transcriptomic profiling of saliva using expression microarray technologies.
• Reverse transcription polymerase chain reaction (RT-PCR) to detect specific mRNA transcripts.

Main Results:

• A significant overlap was observed between identified saliva proteins and mRNA transcripts.
• 61-70% of identified, function-known salivary proteins had corresponding mRNA transcripts in saliva.
• Further analysis confirmed the presence of mRNA for 68% of proteins lacking detectable mRNA initially, and protein products for many detected mRNAs.

Conclusions:

• Saliva proteins and their corresponding mRNA transcripts co-exist in human whole saliva.
• The saliva transcriptome provides valuable insights into the composition and potential origins of the salivary proteome.
• This co-existence suggests potential roles for salivary mRNA beyond protein synthesis, possibly in gene regulation or as biomarkers.