Assessing cell-specific effects of genetic variations using tRNA microarrays.

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Synonymous single-nucleotide variants (SNVs) were traditionally considered neutral as they do not alter the encoded amino acid.
• Emerging evidence suggests tissue-specific and transfer RNA (tRNA)-dependent effects of genetic variations, challenging the neutrality of synonymous SNVs in protein biogenesis.

Purpose of the Study:

• To investigate the impact of synonymous SNVs on protein biogenesis.
• To explore the role of tRNA abundance in mediating the effects of synonymous SNVs.
• To assess the implications of these findings for cystic fibrosis (CF) research and drug development.

Main Methods:

• Systematic analysis of tRNA abundance across diverse cell models relevant to cystic fibrosis (CF) research.
• Comparison of tRNA abundance in Fischer rat thyroid (FRT) cells, primary human bronchial epithelia (HBE), primary human nasal epithelia (HNE), intestinal organoids, and human induced pluripotent stem cells (iPSCs).
• Evaluation of synonymous SNVs' effects in immortalized CF bronchial cells (CFBE41o⁻), HeLa, and HEK293 cell lines.

Main Results:

• Differential effects of specific synonymous SNVs were observed.
• These differential effects correlated with variable concentrations of cognate transfer RNAs (tRNAs).

Conclusions:

• Synonymous SNVs can alter local mRNA translation kinetics, impacting protein biogenesis and function.
• These variations may influence mechanistic analyses and drug screening outcomes.
• Careful selection of model systems based on genetic variation profiles is crucial for accurate research results.