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Effect of housing condition (group- or single-housing) on gene expression in African turquoise killifish II.

ABSTRACT: To explore the effects of the housing condition (group- or single-housing) on killifish, we performed RNA-seq analysis for the whole bodies of male and female juveniles, gonads of males and females from puberty to middle age, and livers of young and old males.

ORGANISM(S): Nothobranchius furzeri

PROVIDER: GSE245481 | GEO | 2024/10/13

REPOSITORIES: GEO

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Effect of housing condition (group- or single-housing) on gene expression in African turquoise killifish I.

Project description:To explore the effects of the housing condition (group- or single-housing) on killifish, we performed RNA-seq analysis for the whole bodies of male and female juveniles, gonads of males and females from puberty to middle age, and livers of young and old males.

2024-10-13 | GSE245480 | GEO

Circular RNAs in the ageing African turquoise killifish

Project description:In this work we took 9 samples from brain and 6 samples from muscle of the African turquoise killifish (Nothobranchius furzeri) at 3.5, 8.5 and 14 weeks. Total RNA was sequenced and circRNAs were detected.

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Effect of housing condition (group- or single-housing) on gene expression in African turquoise killifish

Project description:This SuperSeries is composed of the SubSeries listed below.

2024-10-13 | GSE245483 | GEO

Circular RNAs in the ageing African turquoise killifish

Project description:Circular RNAs in the ageing African turquoise killifish

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Chromosome conformation capture (Hi-C) of the turquoise killifish

Project description:This approach was used to increase the continuity of the killifish genome, and assess the relative distance of specific genes from the sex locus.

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Identification of retinal cell types within the ageing African turquoise killifish retina and their respective age-related transcriptional changes using scRNA-seq

Project description:The mammalian central nervous system (CNS) and its retina are susceptible to age-related patholgoies, resulting in progressive, irreversible diseases like glaucoma and age-related macular degeneration (AMD), which are increasingly prevalent with rising life expectancy. Currently, there are no targeted long-term therapies to prevent vision loss. The short lived African turquoise killifsh (Nothobranchius furzeri, GRZ-AD) is a valuable genetic model for ageing studies, displaying rapid ageing phenotypes within its four to six-month lifespan. Our investigation on the molecular consequences of ageing in the retina, employing scRNA-sequencing, shows a a comprehensive overview of the cellular heterogeneity of the killifish retina, uncovering age-related gene expression changes specific to certain retinal cell populations.

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The African Turquoise Killifish Genome Provides Insights into Evolution and Genetic Architecture of Lifespan.

Project description:Lifespan is a remarkably diverse trait ranging from a few days to several hundred years in nature, but the mechanisms underlying the evolution of lifespan differences remain elusive. Here we de novo assemble a reference genome for the naturally short-lived African turquoise killifish, providing a unique resource for comparative and experimental genomics. The identification of genes under positive selection in this fish reveals potential candidates to explain its compressed lifespan. Several aging genes are under positive selection in this short-lived fish and long-lived species, raising the intriguing possibility that the same gene could underlie evolution of both compressed and extended lifespans. Comparative genomics and linkage analysis identify candidate genes associated with lifespan differences between various turquoise killifish strains. Remarkably, these genes are clustered on the sex chromosome, suggesting that short lifespan might have co-evolved with sex determination. Our study provides insights into the evolutionary forces that shape lifespan in nature.

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Sperm cryopreservation and in vitro fertilization techniques for the African turquoise killifish Nothobranchius furzeri.

Project description:Over the last decade, the African turquoise killifish, Nothobranchius furzeri, has emerged as an important model system for the study of vertebrate biology and ageing. Propagation of laboratory inbred strains of Nothobranchius furzeri, such as GRZ, however, can pose challenges due to the short window of fertility, the efforts and space requirements involved in continuous strain maintenance, and the risks of further inbreeding. The current method for long term strain preservation relies on arrest of embryos in diapause. To create an alternative for long term maintenance, we developed a robust protocol to cryopreserve and revive sperm for in vitro fertilization (IVF). We tested a variety of extender and activator buffers for sperm IVF, as well as cryoprotectants to achieve practical long-term storage and fertilization conditions tailored to this species. Our protocol enabled sperm to be preserved in a cryogenic condition for months and to be revived with an average of 40% viability upon thawing. Thawed sperm were able to fertilize nearly the same number of eggs as natural fertilization, with an average of ~ 25% and peaks of ~ 55% fertilization. This technical advance will greatly facilitate the use of N. furzeri as a model organism.

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An automated feeding system for the African killifish reveals effects of dietary restriction on lifespan and allows scalable assessment of associative learning

Project description:To study the effect of dietary restriction on killifish, we generated transcriptomes (RNA-seq) for the livers and brains of male and female killifish that had been subjected to different dietary treatements.

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Regulation of life span by the gut microbiota in the short-lived African turquoise killifish.

Project description:Gut bacteria occupy the interface between the organism and the external environment, contributing to homeostasis and disease. Yet, the causal role of the gut microbiota during host aging is largely unexplored. Here, using the African turquoise killifish (Nothobranchius furzeri), a naturally short-lived vertebrate, we show that the gut microbiota plays a key role in modulating vertebrate life span. Recolonizing the gut of middle-age individuals with bacteria from young donors resulted in life span extension and delayed behavioral decline. This intervention prevented the decrease in microbial diversity associated with host aging and maintained a young-like gut bacterial community, characterized by overrepresentation of the key genera Exiguobacterium, Planococcus, Propionigenium and Psychrobacter. Our findings demonstrate that the natural microbial gut community of young individuals can causally induce long-lasting beneficial systemic effects that lead to life span extension in a vertebrate model.

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