{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T15:22:05Z","timestamp":1760368925666},"reference-count":46,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2010,6,11]],"date-time":"2010-06-11T00:00:00Z","timestamp":1276214400000},"content-version":"vor","delay-in-days":10,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Birth Defects Research Pt C"],"published-print":{"date-parts":[[2010,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Hemimelic extra toes (<jats:italic>Hx<\/jats:italic>) arose spontaneously as a dominant mutation in B10.D2\/nSnJ mice in 1967. It specifically affects the appendicular skeleton, causing variable foreshortening of the tibia (radius) and preaxial polydactylism. Early anatomical studies revealed anterior overgrowth of the autopod, with decreased apoptosis and increased mitosis in the anterior apical ectodermal ridge and underlying mesenchyme; overextension of apoptosis in the central zeugopod accounted for hemimelia. The <jats:italic>Hx<\/jats:italic> mutant phenotype was coarsely mapped to mouse chromosome (Chr) 5 and closely linked to engrailed\u20102 (<jats:italic>En2<\/jats:italic>) and Sonic hedgehog (Shh). This region is syntenic to human Chr 7q36 that harbors several dominant mutations affecting the hand. High\u2010resolution genome mapping identified the <jats:italic>Hx<\/jats:italic> mutation as a G \u2192 A base pair transition within Intron 5 of the murine <jats:italic>Lmbr1<\/jats:italic> locus. The critical effect is on a multifunctional conserved regulatory element that acts as a limb\u2010specific, long\u2010distance <jats:italic>cis<\/jats:italic>\u2010acting enhancer of <jats:italic>Shh<\/jats:italic> expression. As such, the <jats:italic>Hx<\/jats:italic> mutant phenotype results from ectopic Shh signals at the anterior margin of the limb bud that directly or indirectly alter FGF4 signaling from the apical ectodermal ridge. Given significant advances in understanding of embryonic development in general and limb development in particular, this review article reveals how research that once attracted interest of teratologists has advanced across the decades to pinpoint a critical molecular lesion and reveal a potential mechanism of a specific malformation that is found commonly in experimental teratology. Birth Defects Research (Part C) 90:155\u2013162, 2010. \u00a9 2010 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/bdrc.20181","type":"journal-article","created":{"date-parts":[[2010,6,12]],"date-time":"2010-06-12T06:19:05Z","timestamp":1276323545000},"page":"155-162","source":"Crossref","is-referenced-by-count":9,"title":["The Hemimelic extra toes mouse mutant: Historical perspective on unraveling mechanisms of dysmorphogenesis"],"prefix":"10.1002","volume":"90","author":[{"given":"Thomas B.","family":"Knudsen","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Devendra M.","family":"Kochhar","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2010,6,11]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.devcel.2008.11.011"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1242\/dev.036418"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1168755"},{"key":"e_1_2_8_5_1","first-page":"969","article-title":"Unusual pattern of Sonic hedgehog expression in the polydactylous mouse mutant Hemimelic extra\u2010toes","volume":"46","author":"Blanc I","year":"2002","journal-title":"Int J Dev Biol"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmeth.1219"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097-0177(199801)211:1<88::AID-AJA8>3.0.CO;2-3"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1242\/dev.120.11.3339"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1006\/geno.2000.6225"},{"key":"e_1_2_8_10_1","unstructured":"CookSA DavissonMT.2003. Two mutations in theLmbr1andHxregion of mouse chromosome 5. Mouse Genome Informatics (MGI) The Jackson Laboratory. Available at:http:\/\/mousemutant.jax.org\/articles\/mmr_mutant_hxl_and_hxl2.html."},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/aja.1001060202"},{"key":"e_1_2_8_12_1","first-page":"24","article-title":"Hemimelic extra toes, Hx","volume":"38","author":"Dickie MM","year":"1968","journal-title":"Mouse News Lett"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1006\/jtbi.1998.0876"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ydbio.2008.01.031"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1001\/archsurg.1936.01190030002001"},{"key":"e_1_2_8_16_1","first-page":"505","volume-title":"Developmental biology","author":"Gilbert SF","year":"2006"},{"key":"e_1_2_8_17_1","first-page":"323","volume-title":"Ecological developmental biology. 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