From: Charles Date: Fri, 28 Feb 2020 04:28:46 +0000 (+0900) Subject: Café X-Git-Url: https://source.charles.plessy.org/?a=commitdiff_plain;h=f7755c5226393fb98b605120a027e91e1abb9b90;p=source.git Café --- diff --git a/biblio/32029598.mdwn b/biblio/32029598.mdwn new file mode 100644 index 00000000..ad6de061 --- /dev/null +++ b/biblio/32029598.mdwn @@ -0,0 +1,10 @@ +[[!meta title="A chordate species lacking Nodal utilizes calcium oscillation and Bmp for left-right patterning."]] +[[!tag Oikopleura]] + +Onuma TA, Hayashi M, Gyoja F, Kishi K, Wang K, Nishida H. + +Proc Natl Acad Sci U S A. 2020 Feb 25;117(8):4188-4198. doi:10.1073/pnas.1916858117 + +A chordate species lacking Nodal utilizes calcium oscillation and Bmp for left-right patterning. + +[[!pmid 32029598 desc="“Descendant cells of the L- and R-cells were distributed asymmetrically throughout the organism, even in most morphologically symmetric organs.” “L- and R-cells in the two-cell embryo show stereotyped asymmetries in their cell fates; this is in contrast to ascidian and vertebrate embryos.” “Both oral glands [...] were L-descendants. In contrast, the subchordal cells, [...] were R-descendants. The oral gland and subchordal cells have been proposed to share an ontogenic origin, because only larvacean species with an oral gland have subchordal cells. However, our results suggest that these two cells had a different origin.” “Bmp.a expression was detected in 40% of the R-cells, but none of the L-cells.” “Ca2+ oscillation is required for Bmp.a expression.”"]] diff --git a/tags/Oikopleura.mdwn b/tags/Oikopleura.mdwn index 06d0a29b..7f0bd9a3 100644 --- a/tags/Oikopleura.mdwn +++ b/tags/Oikopleura.mdwn @@ -343,23 +343,25 @@ Development - The tandem _propA_ and _propB_ genes control directly or indirectly _oik41a_ and proper development of the house-secreting epithelium ([[Mikhaleva et al., 2018|biblio/30217597]]). - - The oral gland precursor is a syncytium with 4 nuclei that migrates - anteriorly. The two differentiated oral gland cells have two nuclei each, - as demonstrated by a co-staining of nuclei (H2B-mCherry) and cell membrane - (PH-YF) by [[Kishi and coll, 2014|biblio/25224225]]. - The endodermal strand is the strand of 16 cells that lie in a single line. The endodermal cells strand migrate from the tail to the trunk and give rise to the posterior part of the digestive tract (rectum), but not the anus. Removal of the trunk suggests that it is not necessary for initiation of the migration ([[Kishi and coll, 2014|biblio/25224225]]). - - Notochord cell precursors express _Brachyury_ like in other chordates - ([[Bassham and Postlethwait (2000)|biblio/10753519]]). + - The oral gland precursor is a syncytium with 4 nuclei that migrates + anteriorly. The two differentiated oral gland cells have two nuclei each, + as demonstrated by a co-staining of nuclei (H2B-mCherry) and cell membrane + (PH-YF) by [[Kishi and coll, 2014|biblio/25224225]]. + - Oral gland and subchordal cells, which were thought to be related, do not originate + from the same blastomere ([[Onuma and coll., 2020|biblio/32029598]]). - The subchordal cell precursors migrate along the right side of the notochord in the space that has been filled with endodermal strand cells. Amputation experiments indicate that the posterior portion of the tail is required for posterior migration of subchordal cell precursors ([[Kishi and coll, 2014|biblio/25224225]]). They express _Brachyury_ ([[Bassham and Postlethwait (2000)|biblio/10753519]]). + - Notochord cell precursors express _Brachyury_ like in other chordates + ([[Bassham and Postlethwait (2000)|biblio/10753519]]). - Expression of development genes is retarded by polyunsaturated aldehydes produced by diatoms ([[Torres-Águila and coll., 2018|biblio/30272001]]). - Endocycling cells show no polytenisation nor _in loco_ amplifications. Deep invaginations