RRC ID 3389
Author Kadandale P, Stewart-Michaelis A, Gordon S, Rubin J, Klancer R, Schweinsberg P, Grant BD, Singson A.
Title The egg surface LDL receptor repeat-containing proteins EGG-1 and EGG-2 are required for fertilization in Caenorhabditis elegans.
Journal Curr. Biol.
Abstract The molecular machinery that mediates sperm-egg interactions at fertilization is largely unknown. We identify two partially redundant egg surface LDL receptor repeat-containing proteins (EGG-1 and EGG-2) that are required for Caenorhabditis elegans fertility in hermaphrodites, but not males. Wild-type sperm cannot enter the morphologically normal oocytes produced by hermaphrodites that lack egg-1 and egg-2 function despite direct gamete contact. Furthermore, we find that levels of meiotic maturation/ovulation and sperm migratory behavior are altered in egg-1 mutants. These observations suggest an unexpected regulatory link between fertilization and other events necessary for reproductive success. egg-1 and egg-2 are the result of a gene duplication in the nematode lineage leading to C. elegans. The two closely related species C. briggsae and C. remanei encode only a single egg-1/egg-2 homolog that is required for hermaphrodite/female fertility. In addition to being the first identified egg components of the nematode fertilization machinery, the egg-1 and egg-2 gene duplication could be vital with regards to maximizing C. elegans fecundity and understanding the evolutionary differentiation of molecular function and speciation.
Volume 15(24)
Pages 2222-9
Published 2005-12-20
DOI 10.1016/j.cub.2005.10.043
PII S0960-9822(05)01296-0
PMID 16360684
MeSH Animals Animals, Genetically Modified Caenorhabditis elegans / physiology* Caenorhabditis elegans Proteins / genetics Caenorhabditis elegans Proteins / metabolism* Cluster Analysis Computational Biology Female Fertilization / physiology* Green Fluorescent Proteins Male Ovum / metabolism* Phylogeny* RNA Interference Receptors, Cell Surface / metabolism* Receptors, LDL / metabolism* Sequence Analysis, DNA Sperm-Ovum Interactions / physiology*
IF 9.193
Times Cited 27
C.elegans tm1071