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Over the past two decades, a growing family of synthetic approaches\u2014high-throughput mapping such as deep mutational scanning, reconstructive experiments such as ancestral sequence reconstruction, controlled evolution, and synthetic biology in the narrower sense\u2014have made it possible to test these questions directly by systematically exploring sequence space, reconstructing historical states, replaying evolution under defined conditions, and engineering biological systems. Here, we review how these approaches reshape several foundational questions: the distribution of mutational effects, the structure and navigability of fitness landscapes, the evolution of evolvability, developmental constraint, historical contingency, and the engineering of evolutionary systems. Across these domains, these experiments are exposing unexpected mechanistic detail that refines and extends classical theory\u2014revealing, for example, how strongly mutational effects depend on environmental and genetic context, how ruggedness can coexist with broad accessibility on fitness landscapes, how genotype\u2013phenotype maps are intrinsically biased and heterogeneous, and how random sequences carry latent functional potential that may serve as raw material for later innovation. As these technologies continue to expand the empirical reach of evolutionary biology, theory in turn sharpens the questions they are best suited to address\u2014an iterative dialogue between experiment and theory that brings us closer to understanding how life evolves.<\/jats:p>","DOI":"10.1093\/gbe\/evag245","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T11:43:27Z","timestamp":1790682207000},"source":"Crossref","is-referenced-by-count":0,"title":["Synthetic Approaches as Empirical Tools for Testing Evolutionary Theory"],"prefix":"10.1093","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1100-4694","authenticated-orcid":false,"given":"Xueying C","family":"Li","sequence":"first","affiliation":[{"name":"Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University , Beijing ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0670-7413","authenticated-orcid":false,"given":"Paco","family":"Majic","sequence":"additional","affiliation":[{"name":"European Molecular Biology Laboratory Developmental Biology Unit, , Heidelberg 69117 ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1572-2279","authenticated-orcid":false,"given":"Cau\u00e3 Antunes","family":"Westmann","sequence":"additional","affiliation":[{"name":"Institute of Bioengineering, School of Engineering, \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne , Lausanne 1015 ,","place":["Switzerland"]},{"name":"Swiss Institute of Bioinformatics, Quartier Sorge-Batiment Genopode , Lausanne 1015 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