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Model-based exploration of the functional capabilities of any given circuit requires systematic mapping of multidimensional spaces of model parameters. Despite significant advances in computational dynamical systems approaches, this analysis remains a nontrivial task. Here, we use a nonlinear system of ordinary differential equations to model oocyte selection in\n                    <jats:italic>Drosophila<\/jats:italic>\n                    , a robust symmetry-breaking event that relies on autoregulatory localization of oocyte-specification factors. By applying an algorithmic approach that implements symbolic computation and topological methods, we enumerate all phase portraits of stable steady states in the limit when nonlinear regulatory interactions become discrete switches. Leveraging this initial exact partitioning and further using numerical exploration, we locate parameter regions that are dense in purely asymmetric steady states when the nonlinearities are not infinitely sharp, enabling systematic identification of parameter regions that correspond to robust oocyte selection. This framework can be generalized to map the full parameter spaces in a broad class of models involving biological switches.\n                  <\/jats:p>","DOI":"10.1371\/journal.pcbi.1008711","type":"journal-article","created":{"date-parts":[[2021,2,8]],"date-time":"2021-02-08T21:33:23Z","timestamp":1612820003000},"page":"e1008711","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":11,"title":["Mapping parameter spaces of biological switches"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6115-7891","authenticated-orcid":true,"given":"Rocky","family":"Diegmiller","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0928-7568","authenticated-orcid":true,"given":"Lun","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2168-0757","authenticated-orcid":true,"given":"Marcio","family":"Gameiro","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9278-5532","authenticated-orcid":true,"given":"Justinn","family":"Barr","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jasmin","family":"Imran Alsous","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5704-2349","authenticated-orcid":true,"given":"Paul","family":"Schedl","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9152-9334","authenticated-orcid":true,"given":"Stanislav Y.","family":"Shvartsman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Konstantin","family":"Mischaikow","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2021,2,8]]},"reference":[{"issue":"2","key":"pcbi.1008711.ref001","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1016\/j.devcel.2017.09.016","article-title":"The origin of animal multicellularity and cell differentiation","volume":"43","author":"T Brunet","year":"2017","journal-title":"Dev. 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