RRC ID 3404
Author Ahmed S.
Title Uncoupling of pathways that promote postmitotic life span and apoptosis from replicative immortality of Caenorhabditis elegans germ cells.
Journal Aging Cell
Abstract A dichotomy exists between germ and somatic cells in most organisms, such that somatic cell lineages proliferate for a single generation, whereas the germ cell lineage has the capacity to proliferate from one generation to the next, indefinitely. Several theories have been proposed to explain the unlimited replicative life span of germ cells, including the elimination of damaged germ cells by apoptosis or expression of high levels of gene products that prevent aging in somatic cells. These theories were tested in the nematode Caenorhabditis elegans by examining the consequences of eliminating either apoptosis or the daf-16, daf-18 or sir-2.1 genes that promote longevity of postmitotic somatic cells. However, germ cells of strains deficient for these activities displayed an unlimited proliferative capacity. Thus, C. elegans germ cells retain their youthful character via alternative pathways that prevent or eliminate damage that accumulates as a consequence of cell proliferation.
Volume 5(6)
Pages 559-63
Published 2006-12
DOI 10.1111/j.1474-9726.2006.00244.x
PMID 17081157
MeSH Animals Apoptosis / genetics* Caenorhabditis elegans / cytology Caenorhabditis elegans / genetics* Caenorhabditis elegans / metabolism* Caenorhabditis elegans Proteins / genetics Cell Cycle / genetics Cell Proliferation Cellular Senescence / genetics* DNA Damage / genetics Forkhead Transcription Factors Gene Expression Regulation / genetics Germ Cells / cytology Germ Cells / metabolism* Longevity / genetics* Mitosis / genetics Models, Animal Signal Transduction / genetics Sirtuins / genetics Transcription Factors / genetics
IF 7.346
Times Cited 5
C.elegans tm764