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In vertebrates, guidance cues are critical for establishing a coarse topographic map, while neuronal activity directs fine-scale topography between adjacent afferent terminals. However, the molecular mechanism underlying activity-dependent fine-scale topography is not well known. Studies in the <jats:italic>Drosophila<\/jats:italic> visual system have demonstrated that cell-adhesion molecules direct fine-scale topography, but whether or not these molecules are involved in activity-dependent fine-scale topography remains to be determined. We previously reported that the nociceptors in <jats:italic>Drosophila<\/jats:italic> larvae form an activity-dependent fine-scale topographic system. The establishment of this system is instructed by the level of neuronal activity in individual nociceptors. Here, we show that the atypical cadherin Flamingo (Fmi) is required for establishing the nociceptor topographic map. We found that the topographic defect caused by loss of <jats:italic>fmi<\/jats:italic> was epistatic to the inhibition of neuronal activity and the overexpression of the activity-regulated gene <jats:italic>Trim9<\/jats:italic>. These results suggest that Fmi and neuronal activity interact to regulate fine-scale topography. This study provides a link between neuronal activity and the cell-adhesion molecule in the establishment of fine-scale topography.<\/jats:p>","DOI":"10.1186\/s13041-019-0531-7","type":"journal-article","created":{"date-parts":[[2019,12,10]],"date-time":"2019-12-10T13:03:52Z","timestamp":1575983032000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["The atypical cadherin flamingo determines the competence of neurons for activity-dependent fine-scale topography"],"prefix":"10.1186","volume":"12","author":[{"given":"Ruonan","family":"Li","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuhua","family":"Liang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Siyang","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qun","family":"He","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1352-4263","authenticated-orcid":false,"given":"Limin","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,12,10]]},"reference":[{"issue":"5290","key":"531_CR1","doi-asserted-by":"publisher","first-page":"1133","DOI":"10.1126\/science.274.5290.1133","volume":"274","author":"LC Katz","year":"1996","unstructured":"Katz LC, Shatz CJ. 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