title: Zfp36l3, a rodent X chromosome gene encoding a placenta-specific member of the Tristetraprolin family of CCCH tandem zinc finger proteins.
abstract: Members of the tristetraprolin (TTP) family of CCCH tandem zinc finger (TZF) proteins can bind directly to AU-rich elements (ARE) in mRNA, causing deadenylation and destabilization of the transcripts to which they bind. We describe here a novel fourth mammalian member of the TTP protein family, designated ZFP36L3, which could also bind directly to ARE-containing RNAs and could promote the deadenylation and degradation of ARE-containing target RNAs. Zfp36l3 transcript expression was detected only in placenta and extraembryonic tissues in the mouse. It was expressed throughout development in the placenta and was particularly highly expressed in the cells of the labyrinthine layer of the trophoblastic placenta. Unlike the other family members, the expression of a ZFP36L3-green fluorescent protein fusion protein was entirely cytoplasmic when expressed in 293 cells, even in the presence of the CRM1-dependent nuclear export inhibitor leptomycin B. Zfp36l3 was located on the mouse X chromosome; a similar predicted gene was present on the rat X chromosome, but there was no evidence for a similar gene in humans. ZFP36L3 may thus be a rodent-specific or even murine-specific member of the TTP protein family. Its presumed role in placental physiology may be unique to rodents or murine rodents, but this role may be subsumed by other family members in nonrodents.
authors.affiliation: Laboratory of Neurobiology, Office of Clinical Research, National Institute of Environmental Health Sciences, North Carolina 27709, USA. black009@niehs.nih.gov
authors.forename: Perry J
authors.initials: PJ
authors.lastname: Blackshear
authors.forename: Ruth S
authors.initials: RS
authors.lastname: Phillips
authors.forename: Sanjukta
authors.initials: S
authors.lastname: Ghosh
authors.forename: Silvia B V
authors.initials: SB
authors.lastname: Ramos
authors.forename: Silvia V B
authors.initials: SV
authors.lastname: Ramos
authors.forename: Eric K
authors.initials: EK
authors.lastname: Richfield
authors.forename: Wi S
authors.initials: WS
authors.lastname: Lai
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D024202:Electrophoretic Mobility Shift Assay; D005260:Female; D017874:Immediate-Early Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D017403:In Situ Hybridization; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D010920:Placenta / Q000378:metabolism / Q000502:physiology*; D011247:Pregnancy; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D020080:Tandem Repeat Sequences; D014162:Transfection; D051816:Tristetraprolin; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D014960:X Chromosome / Q000235:genetics; D016335:Zinc Fingers / Q000235:genetics*
chemical_list: D004268:DNA-Binding Proteins; D017874:Immediate-Early Proteins; D012333:RNA, Messenger; D051816:Tristetraprolin; D014409:Tumor Necrosis Factor-alpha; C497553:Zfp36 protein, mouse