Embryonic Lethality
Embryonic Lethality - Related Videos
02:41
Lethal Alleles
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2021
Agouti: A Lethal Allele Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
10:51
A System for ex vivo Culturing of Embryonic Pancreas
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Cited by 23 •
2012
Here, we describe a method for isolation, culture and manipulation of mouse embryonic pancreas. This represents an excellent ex vivo system for studying various aspects of pancreatic development, including morphogenesis, differentiation and growth. Pancreatic bud explants can be cultured for several days and used in a range of different applications, including whole-mount immunofluorescence and live imaging.
09:09
Lethality Bioassay Using Artemia salina L.
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Cited by 20 •
2022
This work aims to evaluate and review the Artemia salina lethality bioassay procedure, also identified as brine shrimp lethality assay. This simple and cheap method gives information about the general toxicity (considered as a preliminary toxicity evaluation) of samples, namely, natural products.
08:39
Shifting Zebrafish Lethal Skeletal Mutant Penetrance by Progeny Testing
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Cited by 8 •
2017
The goal of this protocol is to alter the penetrance of lethal skeletal mutant phenotypes in zebrafish by selective breeding. Lethal mutants cannot be grown to adulthood and bred themselves, therefore this protocol describes a method for tracking and selecting penetrance through multiple generations by progeny testing.
14:40
Long-term Lethal Toxicity Test with the Crustacean Artemia franciscana
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Cited by 34 •
2012
This study concerns the development and standardization of a valuable methodological protocol to determine long-term (14 days) lethal toxicity exerted by chemical substances, industrial wastewater or sewage and liquid environmental samples on the saltwater crustacean, Artemia franciscana.
FAQs
The timing determines which developmental stage is affected and therefore when development stops. An early disruption may prevent fundamental processes required for continued development, whereas a later disruption may reveal roles for a gene, cellular process, or pathway at a more specific stage. Comparing the timing of lethal phenotypes helps researchers connect developmental requirements with particular biological events.
Mutations can disrupt essential developmental pathways that coordinate normal embryonic progression. When a pathway is required for a critical developmental process, its disruption can prevent the embryo from continuing to develop. Studying the resulting lethal phenotype provides evidence that the affected gene or pathway has an indispensable role, helping researchers analyze how developmental mechanisms are organized.
Chromosome-number abnormalities and defects in cellular processes represent distinct routes to developmental failure from mutations affecting a specific gene. Both can interrupt normal development, but they point to different biological levels of causation. Distinguishing these possibilities allows researchers to relate the observed phenotype to genetic organization, essential cellular functions, or specific developmental mechanisms.
In genetic studies, embryonic lethality serves as evidence that a gene or genetic process is required for normal development. Researchers examine the lethal developmental phenotype to identify essential gene functions and determine when disruption becomes consequential. This approach is especially informative when a gene’s importance cannot be inferred from later developmental or disease-related observations alone.
Animal models provide a research context for examining embryonic lethality, including the timing and developmental consequences of disrupted genes or conditions. They help investigators analyze developmental mechanisms and connect genetic changes with observable outcomes. These models also support research into reproductive biology and diseases in which abnormal development or essential gene functions are relevant.
Researchers can use lethal developmental phenotypes to assess whether environmental or therapeutic exposures interfere with normal development. The occurrence and developmental timing of the phenotype provide evidence about the exposure’s effects on the embryo or its maternal environment. Such findings contribute to reproductive biology and disease research by identifying conditions associated with failed development.