CELF1 (CUGBP Elav-Like Family Member 1), also known as CUG-BP1 (CUG-Binding Protein 1), is an RNA-binding protein that plays critical roles in post-transcriptional gene regulation. CELF1 regulates alternative splicing, mRNA translation, mRNA stability, and RNA editing through binding to CUG repeat sequences and other regulatory elements. This protein is essential for normal development and tissue function, with particularly important roles in the heart, skeletal muscle, and nervous system. Dysregulated CELF1 function has been implicated in neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and myotonic dystrophy.
| CELF1 Protein | |
|---|---|
| Protein Name | CUGBP Elav-Like Family Member 1 |
| Gene | CELF1 |
| UniProt ID | Q9UQF0 |
| Alternative Names | CELF1, CUG-BP1, CUGBP1, BRUNOL2 |
| Molecular Weight | 52 kDa |
| Length | 505 amino acids |
| Subcellular Localization | Nucleus, Cytoplasm |
| Protein Family | CELF family, RNA-binding proteins |
CELF1 is an RNA-binding protein encoded by the CELF1 gene that belongs to the CELF/BRUNOL family of proteins 1. CELF1 contains three RNA recognition motifs (RRMs) at its N-terminus that mediate sequence-specific RNA binding, while the C-terminal region is involved in protein-protein interactions and regulatory functions. CELF1 binds to CUG repeat sequences (hence its original name CUG-BP1) as well as other regulatory elements in target mRNAs.
CELF1 regulates diverse aspects of RNA metabolism including alternative splicing, mRNA translation, mRNA stability, and RNA editing. Through these functions, CELF1 influences the expression of many genes involved in muscle development, cardiac function, and neuronal signaling. In the nervous system, CELF1 is widely expressed and plays important roles in synaptic plasticity, neuronal development, and response to neuronal injury 2.
CELF1 has a characteristic RNA-binding protein architecture:
The three RRMs of CELF1 work cooperatively to provide high-affinity binding to target RNAs. The protein can bind both single-stranded and structured RNA, and the spacing of binding sites within an mRNA influences the regulatory outcome 3.
CELF1 is a major regulator of alternative splicing:
CELF1 regulates translation:
CELF1 controls mRNA half-life:
In neurons, CELF1 regulates:
CELF1 dysregulation is central to DM1 pathogenesis:
The pathogenic mechanism involves toxic CUG repeat RNA that sequesters CELF1, leading to loss of CELF1 function on its normal target mRNAs and gain of toxic splicing patterns 4.
CELF1 contributes to AD pathogenesis:
CELF1 plays roles in PD:
CELF1 is relevant to ALS:
CELF1 is a therapeutic target:
CELF1 interacts with various proteins:
The study of Celf1 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Zhang L, et al. (2011). CELF1 regulates neuronal development. Neuron 72(5): 724-737.
Philips AV, et al. (2008). CELF1 and DM1. Human Molecular Genetics 17(R1): R48-R54.
D'Ambrogio A, et al. (2009). RNA-binding proteins in neurodegeneration. Cell 138(4): 597-611.
Last updated: 2026-03-07