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Insufficient GnRH disrupts the HPG axis and is often associated with the genetic condition idiopathic hypogonadotropic hypogonadism (IHH). The homeodomain protein sine oculis\u2013related homeobox 6 (Six6) is required for the development of GnRH neurons. Although it is known that Six6 is specifically expressed within a more mature GnRH neuronal cell line and that overexpression of Six6 induces GnRH transcription in these cells, the direct role of Six6 within the GnRH neuron in vivo is unknown. Here we find that global Six6 knockout (KO) embryos show apoptosis of GnRH neurons beginning at embryonic day 14.5 with 90% loss of GnRH neurons by postnatal day 1. We sought to determine whether the hypogonadism and infertility reported in the Six6KO mice are generated via actions within the GnRH neuron in vivo by creating a Six6-flox mouse and crossing it with the LHRHcre mouse. Loss of Six6 specifically within the GnRH neuron abolished GnRH expression in \u223c0% of GnRH neurons. We further demonstrated that deletion of Six6 only within the GnRH neuron leads to infertility, hypogonadism, hypogonadotropism, and delayed puberty. We conclude that Six6 plays distinct roles in maintaining fertility in the GnRH neuron vs in the migratory environment of the GnRH neuron by maintaining expression of GnRH and survival of GnRH neurons, respectively. These results increase knowledge of the role of Six6 in the brain and may offer insight into the mechanism of IHH.<\/jats:p>","DOI":"10.1210\/en.2019-00113","type":"journal-article","created":{"date-parts":[[2019,6,18]],"date-time":"2019-06-18T09:10:21Z","timestamp":1560849021000},"page":"2151-2164","source":"Crossref","is-referenced-by-count":17,"title":["Deletion of the Homeodomain Protein Six6 From GnRH Neurons Decreases GnRH Gene Expression, Resulting in Infertility"],"prefix":"10.1210","volume":"160","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3355-5964","authenticated-orcid":false,"given":"Erica C","family":"Pandolfi","sequence":"first","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences, Center for Reproductive Science and Medicine, University of California, San Diego, La Jolla, California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8044-8857","authenticated-orcid":false,"given":"Karen J","family":"Tonsfeldt","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences, Center for Reproductive Science and Medicine, University of California, San Diego, La Jolla, California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1555-1369","authenticated-orcid":false,"given":"Hanne M","family":"Hoffmann","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences, Center for Reproductive Science and Medicine, University of California, San Diego, La Jolla, California"},{"name":"Department of Animal Science, Michigan State University, East Lansing, Michigan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8856-0410","authenticated-orcid":false,"given":"Pamela L","family":"Mellon","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences, Center for Reproductive Science and Medicine, University of California, San Diego, La Jolla, California"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"80","published-online":{"date-parts":[[2019,6,18]]},"reference":[{"issue":"4782","key":"2019103015092851900_bib1","doi-asserted-by":"crossref","first-page":"1372","DOI":"10.1126\/science.3097822","article-title":"The hypogonadal mouse: reproductive functions restored by gene therapy","volume":"234","author":"Mason","year":"1986","journal-title":"Science"},{"issue":"Jul 9","key":"2019103015092851900_bib2","first-page":"109","article-title":"Reproduction, smell, and neurodevelopmental disorders: genetic defects in different hypogonadotropic hypogonadal syndromes","volume":"5","author":"Valdes-Socin","year":"2014","journal-title":"Front Endocrinol 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