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PMID:18680432

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Citation

Hashmi, S, Ji, Q, Zhang, J, Parhar, RS, Huang, CH, Brey, C and Gaugler, R (2008) A Krüppel-like factor in Caenorhabditis elegans with essential roles in fat regulation, cell death, and phagocytosis. DNA Cell Biol. 27:545-51

Abstract

We demonstrate that a Caenorhabditis elegans Krüppel-like transcription factor is involved in fat regulation, cell death, and phagocytosis in C. elegans. Suppression of C. elegans klf-1 function by RNA interference (RNAi) results in increased fat storage in the intestine of the RNAi worm that directly or indirectly causes germ cells to die. These dead cells are not engulfed or phagocytosed in the RNAi worm. High-level expression of Ce-klf-1 during larval development, as well as its specific localization in the worm's intestine, supports a direct role for Ce-klf-1 in fat regulation. The C. elegans klf-1 encodes a C(2)H(2) zinc finger protein that is known to act as transcriptional modulator of tissue-specific expression. Members of the Krüppel-like factor (KLF) family play a variety of important roles in vertebrate tissue differentiation. KLFs have recently been implicated in energy and glucose homeostasis through their expression in pancreas, adipose, liver, and muscle tissues. The extensive fat storage and increased cell death in the Ce-klf-1 RNAi worm is important in that it may explain the connection between Ce-klf-1 signaling, cell death, and fat storage. This is the first evidence involving Ce-KLF-1 protein in such functions. In future studies, a thorough analysis of cellular functions of other members of C. elegans Krüppel-like transcription factors together with their interactions and pathway activities with other molecular partners should yield significant insights into mammalian KLF proteins.

Links

PubMed Online version:10.1089/dna.2008.0739

Keywords

Adipose Tissue/metabolism; Amino Acid Sequence; Animals; Animals, Genetically Modified; Caenorhabditis elegans/physiology; Caenorhabditis elegans Proteins/antagonists & inhibitors; Caenorhabditis elegans Proteins/genetics; Caenorhabditis elegans Proteins/metabolism; Cell Death/physiology; Gene Expression Regulation, Developmental; Green Fluorescent Proteins/genetics; Intestines/metabolism; Kruppel-Like Transcription Factors/antagonists & inhibitors; Kruppel-Like Transcription Factors/genetics; Kruppel-Like Transcription Factors/metabolism; Kruppel-Like Transcription Factors/physiology; Molecular Sequence Data; Phagocytosis/physiology; RNA Interference; RNA, Helminth/physiology; Reverse Transcriptase Polymerase Chain Reaction; Sequence Homology, Amino Acid; Transgenes/physiology; Zinc Fingers

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

CAEEL:KLF1

involved_in

GO:0006915: apoptotic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

CAEEL:KLF1

involved_in

GO:0044255: cellular lipid metabolic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

CAEEL:KLF1

involved_in

GO:0043277: apoptotic cell clearance

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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