Mutations Affecting Symmetrical Migration of Distal Tip Cells in Caenorhabditis elegans

Genetics ◽  
1999 ◽  
Vol 152 (3) ◽  
pp. 985-997 ◽  
Author(s):  
Kiyoji Nishiwaki
Keyword(s):  
Caenorhabditis Elegans ◽  
Rotational Symmetry ◽  
The Other ◽  
Body Region ◽  
Distal Tip Cells ◽  
Complementation Groups ◽  
Mutant Phenotypes ◽  
Tip Cells ◽  
Posterior Body Region ◽  
Null Mutants

Abstract The rotational symmetry of the Caenorhabditis elegans gonad arms is generated by the symmetrical migration of two distal tip cells (DTCs), located on the anterior and posterior ends of the gonad primordium. Mutations that cause asymmetrical migration of the two DTCs were isolated. All seven mutations were recessive and assigned to six different complementation groups. vab-3(k121) and vab-3(k143) affected anterior DTC migration more frequently than posterior, although null mutants showed no bias. The other five mutations, mig-14(k124), mig-17(k113), mig-18(k140), mig-19(k142), and mig-20(k148), affected posterior DTC migration more frequently than anterior. These observations imply that the migration of each DTC is regulated differently. mig-14 and mig-19 also affected the migration of other cells in the posterior body region. Four distinct types of DTC migration abnormalities were defined on the basis of the mutant phenotypes. vab-3; mig-14 double mutants exhibited the types of DTC migration defects seen for vab-3 single mutants. Combination of mig-17 and mig-18 or mig-19, which are characterized by the same types of posterior DTC migration defects, exhibited strong enhancement of anterior DTC migration defects, suggesting that they affect the same or parallel pathways regulating anterior DTC migration.

scholarly journals Genetic interactions among ADAMTS metalloproteases and basement membrane molecules in cell migration in Caenorhabditis elegans

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0240571
Author(s):  
Ayaka Imanishi ◽  
Yuma Aoki ◽  
Masaki Kakehi ◽  
Shunsuke Mori ◽  
Tomomi Takano ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Basement Membrane ◽  
Collagen Iv ◽  
Wild Type ◽  
Suppressor Mutations ◽  
Genetic Suppressors ◽  
Basement Membrane Protein ◽  
Distal Tip Cells ◽  
Tip Cells ◽  
Shaped Pattern

During development of the Caenorhabditis elegans gonad, the gonadal leader cells, called distal tip cells (DTCs), migrate in a U-shaped pattern to form the U-shaped gonad arms. The ADAMTS (a disintegrin and metalloprotease with thrombospondin motifs) family metalloproteases MIG-17 and GON-1 are required for correct DTC migration. Mutations in mig-17 result in misshapen gonads due to the misdirected DTC migration, and mutations in gon-1 result in shortened and swollen gonads due to the premature termination of DTC migration. Although the phenotypes shown by mig-17 and gon-1 mutants are very different from one another, mutations that result in amino acid substitutions in the same basement membrane protein genes, emb-9/collagen IV a1, let-2/collagen IV a2 and fbl-1/fibulin-1, were identified as genetic suppressors of mig-17 and gon-1 mutants. To understand the roles shared by these two proteases, we examined the effects of the mig-17 suppressors on gon-1 and the effects of the gon-1 suppressors and enhancers on mig-17 gonadal defects. Some of the emb-9, let-2 and fbl-1 mutations suppressed both mig-17 and gon-1, whereas others acted only on mig-17 or gon-1. These results suggest that mig-17 and gon-1 have their specific functions as well as functions commonly shared between them for gonad formation. The levels of collagen IV accumulation in the DTC basement membrane were significantly higher in the gon-1 mutants as compared with wild type and were reduced to the wild-type levels when combined with suppressor mutations, but not with enhancer mutations, suggesting that the ability to reduce collagen IV levels is important for gon-1 suppression.

scholarly journals CROSSOVER SUPPRESSORS AND BALANCED RECESSIVE LETHALS IN CAENORHABDITIS ELEGANS

Genetics ◽  
1978 ◽  
Vol 88 (1) ◽  
pp. 49-65
Author(s):  
Robert K Herman
Keyword(s):  
Caenorhabditis Elegans ◽  
Linkage Group ◽  
The Other ◽  
Crossing Over ◽  
Linkage Groups ◽  
Recessive Lethal ◽  
X Ray ◽  
C Elegans ◽  
Complementation Groups ◽  
The Right

ABSTRACT Two dominant suppressors of crossing over have been identified following X-ray treatment of the small nematode C. elegans. They suppress crossing over in linkage group II (LGII) about 100-fold and 50-fold and are both tightly linked to LGII markers. One, called C1, segregates independently of all other linkage groups and is homozygous fertile. The other is a translocation involving LGII and X. The translocation also suppresses rrossing over along the right half of X and is homozygous lethal. CI has been used as a balancer of LGII recessive lethal and sterile mutations induced by EMS. The frequencies of occurrence of lethals and steriles were approximately equal. Fourteen mutations were assigned to complementation groups and mapped. They tended to map in the same region where LGII visibles are clustered.

Regulation of the UNC-5 netrin receptor initiates the first reorientation of migrating distal tip cells in Caenorhabditis elegans

Development ◽  
2000 ◽  
Vol 127 (3) ◽  
pp. 585-594 ◽  
Author(s):  
M. Su ◽  
D.C. Merz ◽  
M.T. Killeen ◽  
Y. Zhou ◽  
H. Zheng ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Developmental Stage ◽  
Phase 1 ◽  
Critical Role ◽  
The Body ◽  
Dependent Manner ◽  
C Elegans ◽  
Guidance Cue ◽  
Distal Tip Cells ◽  
Tip Cells

Cell migrations play a critical role in animal development and organogenesis. Here, we describe a mechanism by which the migration behaviour of a particular cell type is regulated temporally and coordinated with over-all development of the organism. The hermaphrodite distal tip cells (DTCs) of Caenorhabditis elegans migrate along the body wall in three sequential phases distinguished by the orientation of their movements, which alternate between the anteroposterior and dorsoventral axes. The ventral-to-dorsal second migration phase requires the UNC-6 netrin guidance cue and its receptors UNC-5 and UNC-40, as well as additional, UNC-6-independent guidance systems. We provide evidence that the transcriptional upregulation of unc-5 in the DTCs is coincident with the initiation of the second migration phase, and that premature UNC-5 expression in these cells induces precocious turning in an UNC-6-dependent manner. The DAF-12 steroid hormone receptor, which regulates developmental stage transitions in C. elegans, is required for initiating the first DTC turn and for coincident unc-5 upregulation. We also present evidence for the existence of a mechanism that opposes or inhibits UNC-5 function during the longitudinal first migration phase and for a mechanism that facilitates UNC-5 function during turning. The facilitating mechanism presumably does not involve transcriptional regulation of unc-5 but may represent an inhibition of the phase 1 mechanism that opposes or inhibits UNC-5. These results, therefore, reveal the existence of two mechanisms that regulate the UNC-5 receptor that are critical for responsiveness to the UNC-6 netrin guidance cue and for linking the directional guidance of migrating distal tip cells to developmental stage advancements.

A tissue-specific knock-out strategy reveals that lin-26 is required for the formation of the somatic gonad epithelium in Caenorhabditis elegans

Development ◽  
1998 ◽  
Vol 125 (16) ◽  
pp. 3213-3224 ◽  
Author(s):  
B.G. den Boer ◽  
S. Sookhareea ◽  
P. Dufourcq ◽  
M. Labouesse
Keyword(s):  
Caenorhabditis Elegans ◽  
Null Mutant ◽  
Similar Function ◽  
Knock Out ◽  
Somatic Gonad ◽  
Distal Tip Cells ◽  
Germline Proliferation ◽  
Tip Cells ◽  
New Alleles ◽  
Lineage Analysis

The Caenorhabditis elegans LIN-26 protein is required to specify and/or maintain the fates of all non-neuronal ectodermal cells. Here we show that lin-26 is expressed until the somatic gonad primordium stage in all cells of the somatic gonad, except in distal tip cells, and later in all uterine cells. To determine if lin-26 functions in the somatic gonad, we have generated gonad-specific lin-26 alleles obtained by integration of lin-26 promoter deletion derivatives into a lin-26 null mutant background. In this way, we rescued the lethal phenotype imparted by lin-26 null mutations and uncovered a highly penetrant sterile phenotype. Specifically, the strongest of these new alleles was characterized by the absence of lin-26 expression in the somatic gonad, the presence of endomitotic oocytes, decreased germline proliferation, a protruding vulva and a less penetrant absence of gonad arms. Lineage analysis of mutant somatic gonads and examination of several markers expressed in the spermatheca, sheath cells, distal tip cells and the uterus, suggest that LIN-26 is required in sheath, spermatheca and uterine precursors, and in uterine cells. We conclude that lin-26 performs a similar function in the non-neuronal ectoderm and the somatic gonad, a mesoderm derivative, and we speculate that lin-26 is required to express epithelial characteristics.

scholarly journals The BED finger domain protein MIG-39 halts migration of distal tip cells in Caenorhabditis elegans

2015 ◽  
Vol 397 (2) ◽  
pp. 151-161 ◽  
Author(s):  
Tetsuhiro Kikuchi ◽  
Yukimasa Shibata ◽  
Hon-Song Kim ◽  
Yukihiko Kubota ◽  
Sawako Yoshina ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Distal Tip Cells ◽  
Domain Protein ◽  
Tip Cells

scholarly journals The directed migration of gonadal distal tip cells in Caenorhabditis elegans requires NGAT-1, a ß1,4-N-acetylgalactosaminyltransferase enzyme

PLoS ONE ◽  
2017 ◽  
Vol 12 (8) ◽  
pp. e0183049 ◽  
Author(s):  
Joseph Veyhl ◽  
Robert J. Dunn ◽  
Wendy L. Johnston ◽  
Alexa Bennett ◽  
Lijia W. Zhang ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Directed Migration ◽  
Distal Tip Cells ◽  
Tip Cells

scholarly journals Genetic interactions among ADAMTS metalloproteases and basement membrane molecules in cell migration in Caenorhabditis elegans

2020 ◽  
Author(s):  
Ayaka Imanishi ◽  
Yuma Aoki ◽  
Masaki Kakehi ◽  
Shunsuke Mori ◽  
Tomomi Takano ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Basement Membrane ◽  
Collagen Iv ◽  
Wild Type ◽  
Suppressor Mutations ◽  
Genetic Suppressors ◽  
Basement Membrane Protein ◽  
Distal Tip Cells ◽  
Tip Cells ◽  
Shaped Pattern

AbstractDuring development of the Caenorhabditis elegans gonad, the gonadal leader cells, called distal tip cells (DTCs), migrate in a U-shaped pattern to form the U-shaped gonad arms. The ADAMTS (adisintegrin and metalloprotease with thrombospondin motifs) family metalloproteases MIG-17 and GON-1 are required for correct DTC migration. Mutations in mig-17 result in misshapen gonads due to the misdirected DTC migration, and mutations in gon-1 result in shortened and swollen gonads due to the premature termination of DTC migration. Although the phenotypes shown by mig-17 and gon-1 mutants are very different from one another, mutations that result in amino acid substitutions in the same basement membrane protein genes, emb-9/collagen IV a1, let-2/collagen IV a2 and fbl-1/fibulin-1, were identified as genetic suppressors of mig-17 and gon-1 mutants. To understand the roles shared by these two proteases, we examined the effects of the mig-17 suppressors on gon-1 and the effects of the gon-1 suppressors and enhancers on mig-17 gonadal defects. Some of the emb-9, let-2 and fbl-1 mutations suppressed both mig-17 and gon-1, whereas others acted only on mig-17 or gon-1. These results suggest that mig-17 and gon-1 have their specific functions as well as functions commonly shared between them for gonad formation. The levels of collagen IV accumulation in the DTC basement membrane were significantly higher in the gon-1 mutants as compared with wild type and were reduced to the wild-type levels when combined with suppressor mutations, but not with enhancer mutations, suggesting that the ability to reduce collagen IV levels is important for gon-1 suppression.

scholarly journals SUPPRESSION AND FUNCTION OF X-LINKED LETHAL AND STERILE MUTATIONS IN CAENORHABDITIS ELEGANS

Genetics ◽  
1981 ◽  
Vol 97 (1) ◽  
pp. 65-84
Author(s):  
Philip M Meneely ◽  
Robert K Herman
Keyword(s):  
Caenorhabditis Elegans ◽  
Linkage Map ◽  
X Chromosome ◽  
The Other ◽  
Null Alleles ◽  
Wild Type ◽  
Recessive Lethal ◽  
X Linkage ◽  
And Function ◽  
Null Mutants

ABSTRACT We have expanded our collection of recessive lethal and sterile mutants in the region of the X chromosome balanced by mnDp1(X;V), about 15% of the X linkage map, to a total of 54 mutants. The mutations have been mapped with respect to 20 overlapping deficiencies and five X duplications, and they have been assigned to 24 genes by complementation testing. Nine mutants are hermaphrodite-sterile: one of these is a sperm-defect mutant, two have abnormal gonadogeneses and six, in five genes, are maternally influenced mutants, producing inviable zygote progeny. One of the gonadogenesis mutants and two of the maternally influenced mutants are male fertile. All but one of the maternally influenced mutants give cross progeny when mated with wild-type males. Forty-three mutants were tested for suppression by homozygous sup-5(e1464), which is believed to be specific for null alleles. Ten mutants that were judged by independent criteria not to be null mutants are not suppressed. Nine of the other 33 mutants, in nine genes, are suppressed, five in both heterozygous and homozygous suppressor stocks and four only in homozygous suppressor stocks.

Strategies for control of pattern formation in Caenorhabditis elegans

1981 ◽  
Vol 295 (1078) ◽  
pp. 539-551 ◽  
Keyword(s):  
Caenorhabditis Elegans ◽  
Pattern Formation ◽  
Spatial Organization ◽  
Germ Line ◽  
Close Contact ◽  
Distal Tip Cells ◽  
Somatic Tissues ◽  
Lineage Tree ◽  
A Cell ◽  
Tip Cells

In this paper, strategies for controlling pattern formation in Caenorhabditis elegans are reviewed. The somatic tissues of this small nematode develop, in large part, by invariant cell lineages, whereas the germ-line tissue arises primarily by a variable pattern of divisions. The spatial organization of the germ-line tissue depends on special regulatory cells, the distal tip cells, which appear to influence nearby germ cells to remain in mitosis. In somatic tissues, the problem of specifying that a cell in a particular position assumes a particular fate seems to be controlled by a number of different strategies. These include the production of non-equivalent cells in particular positions of the lineage tree, local interactions between apparently equivalent cells in close contact, and the influence of another special regulatory cell, the anchor cell, over certain neighbouring cells.

Maternal-effect lethal mutations on linkage group II of Caenorhabditis elegans.

Genetics ◽  
1988 ◽  
Vol 120 (4) ◽  
pp. 977-986
Author(s):  
K J Kemphues ◽  
M Kusch ◽  
N Wolf
Keyword(s):  
Caenorhabditis Elegans ◽  
Linkage Group ◽  
Maternal Effect ◽  
Essential Genes ◽  
The Other ◽  
C Elegans ◽  
Lethal Mutations ◽  
Embryonic Lethal ◽  
Embryonic Lethal Mutations ◽  
F1 Progeny

Abstract We have analyzed a set of linkage group (LG) II maternal-effect lethal mutations in Caenorhabditis elegans isolated by a new screening procedure. Screens of 12,455 F1 progeny from mutagenized adults resulted in the recovery of 54 maternal-effect lethal mutations identifying 29 genes. Of the 54 mutations, 39 are strict maternal-effect mutations defining 17 genes. These 17 genes fall into two classes distinguished by frequency of mutation to strict maternal-effect lethality. The smaller class, comprised of four genes, mutated to strict maternal-effect lethality at a frequency close to 5 X 10(-4), a rate typical of essential genes in C. elegans. Two of these genes are expressed during oogenesis and required exclusively for embryogenesis (pure maternal genes), one appears to be required specifically for meiosis, and the fourth has a more complex pattern of expression. The other 13 genes were represented by only one or two strict maternal alleles each. Two of these are identical genes previously identified by nonmaternal embryonic lethal mutations. We interpret our results to mean that although many C. elegans genes can mutate to strict maternal-effect lethality, most genes mutate to that phenotype rarely. Pure maternal genes, however, are among a smaller class of genes that mutate to maternal-effect lethality at typical rates. If our interpretation is correct, we are near saturation for pure maternal genes in the region of LG II balanced by mnC1. We conclude that the number of pure maternal genes in C. elegans is small, being probably not much higher than 12.

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