Idiosyncratic and dose-dependent epistasis drives variation in tomato fruit size.

Idiosyncratic and dose-dependent epistasis drives variation in tomato fruit size.
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DOI:
10.1126/science.adi5222
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发表时间:
2023-10-20
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lippman ZB
Lippman ZB
中科院分区:
其他
文献类型:
--
作者:
Aguirre L;Hendelman A;Hutton SF;McCandlish DM;Lippman ZB

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Epistasis between genes is traditionally studied using mutations that eliminate protein activity, but most natural genetic variation is in cis-regulatory DNA and influences gene expression and function quantitatively. Here, we use natural and engineered cis-regulatory alleles in a plant stem cell circuit to systematically evaluate epistatic relationships controlling tomato fruit size. Combining a promoter allelic series with two other loci, we collected over 30,000 phenotypic data points from 46 genotypes to quantify how allele strength transforms epistasis. We revealed a saturating dose-dependent relationship, but also allele-specific idiosyncratic interactions, including between alleles driving a step change in fruit size during domestication. Our approach and findings expose an underexplored dimension of epistasis, where cis-regulatory allelic diversity within gene regulatory networks elicits non-linear, unpredictable interactions that shape phenotypes. Epistasis analysis across a cis-regulatory allelic series reveals unpredictable, non-linear interactions that shape trait variation.
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