Journal of embryology and experimental morphology最新文献_第8页

Genetic activity at the albino locus in Cattanach's insertion in the mouse. 卡塔纳赫在小鼠体内植入白化位点的遗传活性。

Journal of embryology and experimental morphology Pub Date : 1986-07-01

M S Deol, G M Truslove, A McLaren

{"title":"Genetic activity at the albino locus in Cattanach's insertion in the mouse.","authors":"M S Deol, G M Truslove, A McLaren","doi":"","DOIUrl":"","url":null,"abstract":"Cattanach's insertion (Is(In7;X)1Ct or XCt) includes the normal allele at the albino locus (c+), which is subject to inactivation of the X chromosome carrying it, so that XCtX; cc mice have albino and pigmented patches. The X-autosome translocation T(X;16)16H or XT16H leads to preferential inactivation of the other X chromosome in female cells, so that XCtXT16H; cc mice are almost entirely white. However, they grow darker with age, as if reversal of inactivation of the c+ allele were taking place in increasing numbers of melanocytes. To test whether this is dependent only on age or whether it is related to the number of times the animal has moulted, hair was repeatedly plucked from selected areas at the early telogen stage when the follicles are also removed, assuming that the melanocytes or melanoblasts in that region of the skin would be forced to undergo further divisions to colonize the new follicles. The plucked areas grew darker at the same rate as the rest of the coat, suggesting that the progressive reversal of inactivation is dependent only on age. As direct examination of melanocytes in the follicles is difficult, they were examined in the choroid and the retinal pigment epithelium (RPE) of the eye. The frequency of the pigmented cells was lower in the choroid than in the RPE. Since the melanocytes in these structures are different in origin as well as in physical characteristics, it appears that cell type influences either reversal of inactivation, or the frequency with which the influence of the X chromosome extends to the albino locus.","PeriodicalId":15708,"journal":{"name":"Journal of embryology and experimental morphology","volume":"96 ","pages":"295-302"},"PeriodicalIF":0.0,"publicationDate":"1986-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14160016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The clonal model of vertebral column development: a reinvestigation of vertebral shape using Fourier analysis. 脊柱发育的克隆模型:利用傅里叶分析对椎体形状的重新研究。

Journal of embryology and experimental morphology Pub Date : 1986-07-01

P O'Higgins, D R Johnson, T J McAndrew

引用次数: 0

The histogenetic potential of neural plate cells of early-somite-stage mouse embryos. 早体期小鼠胚胎神经板细胞的组织发生潜能。

Journal of embryology and experimental morphology Pub Date : 1986-07-01

W Y Chan, P P Tam

引用次数: 0

Disruption of segmentation in a short germ insect embryo. I. The location of abnormalities induced by heat shock. 短胚芽昆虫胚胎的节段断裂。1、热休克引起的异常部位。

Journal of embryology and experimental morphology Pub Date : 1986-07-01 DOI: 10.1242/DEV.96.1.245

J. E. Mee, V. French

{"title":"Disruption of segmentation in a short germ insect embryo. I. The location of abnormalities induced by heat shock.","authors":"J. E. Mee, V. French","doi":"10.1242/DEV.96.1.245","DOIUrl":"https://doi.org/10.1242/DEV.96.1.245","url":null,"abstract":"The effect of heat shock (15 min at 48 degrees C) on segmentation has been investigated in the short germ embryo of the locust (Schistocerca gregaria). Prior to formation of the germ anlage and at the disc stage heat shock considerably reduced the survival of eggs but appeared to have little effect upon segmentation. At later stages heat shock had no effect on survival but resulted in disruptions of the segmental pattern. The location of abnormal segments depended upon the stage at heat shock and the number affected depended on its severity. A constant number of normal segments developed between the last segment visible at the time of heat shock and the first abnormal segment. These results are similar to the disruptions observed in amphibian somites following heat shock. However, different parts of the segment pattern varied in their response; the head segments were very rarely affected, and disrupted regions rarely started in the middle abdomen (segments A5 and A6). The results are discussed in relation to two models (the clock and wavefront and progress zone models) that have been proposed as an explanation for the specification of the somite pattern in amphibians.","PeriodicalId":15708,"journal":{"name":"Journal of embryology and experimental morphology","volume":"18 1","pages":"245-66"},"PeriodicalIF":0.0,"publicationDate":"1986-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73467122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Induction of hair follicles in mouse skin by rat vibrissa dermal papillae. 大鼠触须真皮乳头诱导小鼠皮肤毛囊的研究。