Micromere specification in Ilyanassa obsolete involves both cytoplasmic inheritance and cell position relative to the inducing D macromere.

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dc.contributor.author Sweet, Hyla en_US
dc.date.accessioned 2006-08-29T18:34:36Z en_US
dc.date.available 2006-08-29T18:34:36Z en_US
dc.date.issued 1995-08 en_US
dc.identifier.citation Developmental Biology 170N2 (1995) 734-775 en_US
dc.identifier.issn 0012-1606 en_US
dc.identifier.uri http://hdl.handle.net/1850/2565 en_US
dc.description Article may be found at: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WDG-45S91NJ-5T&_user=47004&_handle=V-WA-A-W-VB-MsSAYZA-UUW-U-AACYYADACC-AACZBEDECC-DDVEDVVW-VB-U&_fmt=summary&_coverDate=08%2F31%2F1995&_rdoc=42&_orig=browse&_srch=%23toc%236766%231995%23998299997%23314443!&_cdi=6766&_acct=C000005018&_version=1&_urlVersion=0&_userid=47004&md5=3590188570f9db373e088bc41c8851a3 en_US
dc.description.abstract By virtue of its inheritance of polar lobe material, the D macromere signals the overlying micromeres to develop specialized ectodermal structures (Clement, A., J Exp Zool. 149:193). The first quartet micromeres 1a, 1b, 1c and 1d contribute to the larval head. The left and right eyes arise from 1a and 1c (Render, J., Dev. 113:495), and they will not develop if these cells are removed (Clement, A., J Exp Zool. 166: 77). When the 1a micromere is transplanted to its normal position at the eight cell state, the left eye develops in 38% of the cases. Similarly, when the 1b micromere is transplanted to the position of 1a, the left eye develops in 37% of the cases, indicating that 1b has the same ability to develop an eye as 1a. The 1a micromere never develops an eye in the position of 1b. These findings suggest that 1a, 1b, and 1c may become specified to develop an eye only if they are in close proximity to the inducing D macromere. To further test this hypothesis, the 1a or 1b micromere was transplanted to the position of 1d, the closest first quartet micromere to the inducing D cell. An ectopic third eye develops from the transplanted cell in 42% of the cases. The 1d micromere in the 1a position develops the left eye in only 2% of the cases. This suggests that the 1d micromere has an impaired ability to respond to the inductive signal compared to 1a, 1b, and 1c. Because the 1d micromere is the only first quartet micromere that may inherit polar lobe material, it is possible that cytoplasmic factors restrict this cell from developing an eye in response to the inductive signal. en_US
dc.description.sponsorship Supported by an NIH predoctoral training grant and NSF grant number IBM-9307441. en_US
dc.format.extent 37365 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Elsevier: Developmental Biology en_US
dc.subject Eye development en_US
dc.subject Ilyanassa obsoleta en_US
dc.subject Micromeres en_US
dc.title Micromere specification in Ilyanassa obsolete involves both cytoplasmic inheritance and cell position relative to the inducing D macromere. en_US
dc.type Abstract en_US

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