Insights into the molecular correlates modulating functional compensation between monogenic and polygenic disease gene duplicates in human

Functional redundancy by gene duplication appears to be a common phenomenon in biological system and hence understanding its underlying mechanism deserves much attention. Here, we investigated the differences between functional compensation of monogenic and polygenic disease genes which are unexplored till date. We found that the competence of functional buffering varies in the order of non-disease genes > monogenic disease genes > polygenic disease genes. This fact has been explained by the sequence identity, expression profile similarity, shared interaction partners and cellular locations between duplicated pairs. Moreover, we observed an inverse relationship between backup capacity and the non-synonymous substitution rate of disease and non-disease genes while the opposite trend is found for their corresponding paralogs. Logistic regression analysis among sequence identity, sharing of expression profile, interaction partners and cellular locations with backup capacity between duplicated pairs demonstrated that the sharing of expression profile is the most dominant regulator of backup capacity.