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High Throughput Microinjections of Sea Urchin Zygotes

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Published on: January 21, 2014

Negative senescence in sea urchins.

Thomas A Ebert¹

¹Department of Integrative Biology, Oregon State University, Corvallis, OR 97331, USA.

Experimental Gerontology

|May 8, 2019

Summary

This summary is machine-generated.

Sea urchins exhibit negative senescence, meaning mortality decreases in larger individuals. This phenomenon occurs in both short-lived and long-lived sea urchin species, challenging assumptions about aging in shorter-lived organisms.

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Techniques to Induce and Quantify Cellular Senescence

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Area of Science:

Marine Biology
Gerontology
Ecology

Background:

Negative senescence, a decline in size-specific mortality for larger individuals, is observed in sea urchins.
Sea urchins exhibit indeterminate growth and increasing gamete production with age.
This study examines both short-lived (Lytechinus pictus, L. variegatus) and long-lived (Mesocentrotus franciscanus, Strongylocentrotus purpuratus, Echinometra mathaei, Stomopneustes variolaris) species.

Purpose of the Study:

To investigate the presence and implications of negative senescence in various sea urchin species.
To explore the cellular mechanisms underlying senescence or lack thereof in these organisms.
To challenge the general assumption that short-lived species invariably exhibit senescence.

Main Methods:

Comparative analysis of mortality patterns across different sea urchin species.
Examination of life history traits, including growth and reproduction.
Investigation of cellular mechanisms related to aging and senescence.

Main Results:

Negative senescence was consistently observed across both short-lived and long-lived sea urchin species.
Cellular mechanisms counteracting senescence were identified in both lifespan groups.
The findings indicate that a lack of senescence can occur even in species with high mortality rates.

Conclusions:

Sea urchins provide a unique model for studying negative senescence due to their life history traits.
The presence of negative senescence in short-lived species challenges established theories of aging.
Cellular mechanisms play a crucial role in mitigating senescence, irrespective of species lifespan.