From Peas to Disease: Modifier Genes, Network Resilience, and the Genetics of Health.

Abstract:

:Phenotypes are rarely consistent across genetic backgrounds and environments, but instead vary in many ways depending on allelic variants, unlinked genes, epigenetic factors, and environmental exposures. In the extreme, individuals carrying the same causal DNA sequence variant but on different backgrounds can be classified as having distinct conditions. Similarly, some individuals that carry disease alleles are nevertheless healthy despite affected family members in the same environment. These genetic background effects often result from the action of so-called "modifier genes" that modulate the phenotypic manifestation of target genes in an epistatic manner. While complicating the prospects for gene discovery and the feasibility of mechanistic studies, such effects are opportunities to gain a deeper understanding of gene interaction networks that provide organismal form and function as well as resilience to perturbation. Here, we review the principles of modifier genetics and assess progress in studies of modifier genes and their targets in both simple and complex traits. We propose that modifier effects emerge from gene interaction networks whose structure and function vary with genetic background and argue that these effects can be exploited as safe and effective ways to prevent, stabilize, and reverse disease and dysfunction.

journal_name

Am J Hum Genet

authors

Riordan JD,Nadeau JH

doi

10.1016/j.ajhg.2017.06.004

subject

Has Abstract

pub_date

2017-08-03 00:00:00

pages

177-191

issue

2

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(17)30239-2

journal_volume

101

pub_type

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