Exploring the differences in evolutionary rates between monogenic and polygenic disease genes in human

Area of Science:

• Genomics
• Evolutionary Biology
• Bioinformatics

Background:

• Comparative gene analysis aids understanding of human diseases.
• Previous studies often grouped all disease genes, overlooking distinctions between monogenic diseases (MDs) and polygenic diseases (PDs).
• The molecular mechanisms differentiating MD and PD genes remain underexplored.

Purpose of the Study:

• To comprehensively study polygenic disease (PD) and monogenic disease (MD) genes in comparison to nondisease (ND) genes.
• To elucidate the factors driving the evolutionary rates of PD genes.

Main Methods:

• Comparative analysis of gene conservation across MD, PD, and ND gene categories.
• Sub-categorization of ND genes into housekeeping and other genes.
• Analysis of protein-protein interaction networks, disordered residues, expression levels, and involvement in regulatory processes.
• Logistic regression modeling to determine the relative importance of factors influencing evolutionary rates.

Main Results:

• MD genes are more conserved than PD genes; ND genes are more conserved than both disease gene classes.
• Housekeeping genes exhibit the highest conservation, while other ND genes fall between MD and PD genes in evolutionary rate.
• PD genes show a faster evolutionary rate influenced by date hubs, disordered residues, lower expression levels, and involvement in regulatory processes.

Conclusions:

• Significant differences exist in evolutionary rates and underlying molecular mechanisms between MD and PD genes.
• mRNA expression level, presence of date hubs, protein disorder, and regulatory involvement are key determinants of PD gene evolutionary rates.
• This study provides a nuanced understanding of disease gene evolution, differentiating between monogenic and polygenic disease mechanisms.