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Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment

ABSTRACT: Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment

PROVIDER: PRJNA807639 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18052101_1.fastq.gz	Fastqsanger.gz
	SRR18052101_2.fastq.gz	Fastqsanger.gz
	SRR18052102_1.fastq.gz	Fastqsanger.gz
	SRR18052102_2.fastq.gz	Fastqsanger.gz
	SRR18052103_1.fastq.gz	Fastqsanger.gz

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Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment [N40K neuron RNA-seq]

Project description:Recent proteome and transcriptome profiling of Alzheimer's disease (AD) brains reveals RNA splicing dysfunction and U1 small nuclear ribonucleoprotein (snRNP) pathology containing U1-70K and its N-terminal 40-KDa fragment (N40K). Here we present a causative role of U1 snRNP dysfunction to neurodegeneration in primary neurons and transgenic mice (N40K-Tg), in which N40K expression exerts a dominant-negative effect to downregulate full-length U1-70K. N40K-Tg recapitulates N40K insolubility, neuronal degeneration, cognitive impairment, and erroneous splicing events in synaptic pathways.

2022-08-11 | GSE196872 | GEO

Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment [N40K mice RNA-seq]

2022-08-11 | GSE196871 | GEO

Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment [N40K neuron RNA-seq]

Project description:Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment [N40K neuron RNA-seq]

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Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment [N40K mice RNA-seq]

Project description:Alzheimer’s disease-associated U1 snRNP splicing dysfunction causes neuronal hyperexcitability and cognitive impairment [N40K mice RNA-seq]

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Promoter directionality is controlled by U1 snRNP and polyadenylation signals

Project description:Transcription of the mammalian genome is pervasive, but productive transcription outside of protein-coding genes is limited by unknown mechanisms. In particular, although RNA polymerase II (RNAPII) initiates divergently from most active gene promoters, productive elongation occurs primarily in the sense-coding direction. Here we show in mouse embryonic stem cells that asymmetric sequence determinants flanking gene transcription start sites control promoter directionality by regulating promoter-proximal cleavage and polyadenylation. We find that upstream antisense RNAs are cleaved and polyadenylated at poly(A) sites (PASs) shortly after initiation. De novo motif analysis shows PAS signals and U1 small nuclear ribonucleoprotein (snRNP) recognition sites to be the most depleted and enriched sequences, respectively, in the sense direction relative to the upstream antisense direction. These U1 snRNP sites and PAS sites are progressively gained and lost, respectively, at the 5' end of coding genes during vertebrate evolution. Functional disruption of U1 snRNP activity results in a dramatic increase in promoter-proximal cleavage events in the sense direction with slight increases in the antisense direction. These data suggest that a U1-PAS axis characterized by low U1 snRNP recognition and a high density of PASs in the upstream antisense region reinforces promoter directionality by promoting early termination in upstream antisense regions, whereas proximal sense PAS signals are suppressed by U1 snRNP. We propose that the U1-PAS axis limits pervasive transcription throughout the genome. 3' end sequencing of poly (A) + RNAs in mouse ES cells with and without U1 snRNP inhibition using antisense morpholino oligonucleotides (AMO). Each with two biological replicates.

2013-06-28 | E-GEOD-46433 | biostudies-arrayexpress

Neuronal expression of Alzheimer's disease-associated U1-70K cleavage product causes splicing dysfunction and cognitive impairment in mice

Project description:Alzheimer's disease (AD) displays progressive cognitive decline that is associated with protein ß-amyloid and tau aggregation, but the causative mechanisms are not fully understood. Recent proteomics profiling has identified, in sporadic and familial cases, a tangle-like pathology of U1 small nuclear ribonucleoprotein complex (snRNP), containing U1-70K and its N-terminal cleavage product (N40K), with RNA splicing alteration. To determine whether U1 snRNP dysfunction may play a causative role in AD, we generate a transgenic mouse model (N40K-Tg) by neuronal expression of N40K. Deep transcriptomic analysis of N40K-Tg mice was performed to evaluate intron-retaining mRNAs. Tissue was extracted from hippocampus at three month and twelve month comparing N40K-Tg vs WT mice.

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Condensation of ZFP207 and U1 snRNP promotes spliceosome assembly

Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 results in a series of molecular phenotypes indicative of U1 snRNP dysregulation. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to the stem-loop 3 (SL3) of U1 snRNA, while its C-terminal intrinsically disordered regions (IDRs) undergo phase separation to form biomolecular condensates with U1 snRNP. These condensates create a crowded molecular environment that increases the local concentration of splicing snRNPs and regulators, thereby accelerating the speed of spliceosome assembly by facilitating interactions between U1 snRNP and other snRNPs. Collectively, our study demonstrates the critical role of phase separation in ensuring effective U1 snRNP function and promoting efficient spliceosome assembly.

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U1 snRNP regulates alternative promoter activity by inhibiting premature polyadenylation

Project description:Transcription and splicing are intricately linked processes, with emerging evidence highlighting the involvement of splicing factors mediating their coupling. U1 small nuclear ribonucleoprotein particle (U1 snRNP), a key splicing factor, not only serves as the initial component of the spliceosome but also plays a crucial role in preventing premature cleavage and polyadenylation, facilitating long-distance transcription elongation. Here, we show that U1 snRNP regulates alternative promoter usage through inhibition of premature polyadenylation. Inhibiting U1 snRNP with antisense oligonucleotides or introducing a premature polyadenylation leads to a significant decrease in downstream promoter activity in genes with premature polyadenylation sites in between two promoters. Conversely, restoring U1 snRNP activity or inhibiting premature polyadenylation sites using a gene-specific U1 snRNP rescues downstream promoter activity. Mechanistically, U1 snRNP inhibition correlates with reduced chromatin accessibility and serine 5 phosphorylation levels of RNA polymerase II at downstream promoters. Our findings propose a model where U1 snRNP facilitates productive transcription from upstream promoters, triggering downstream promoter activation by destabilizing nucleosomes and promoting promoter escape.

2025-05-19 | GSE284680 | GEO

iCLIP and NGS to map protein-RNA interactions for U1-snRNP proteins in Trypanosoma brucei

Project description:Individual-nucleotide resolution UV-crosslinking and immunoprecipitation (iCLIP) combined with high-throughput sequencing was performed to generate genome-wide binding maps of two U1-snRNP proteins: U1C and U1-70K in Trypanosoma brucei. 3 (2) biological replicates of U1C (U1-70K) -specific co-immunoprecipitated RNA after UV-crosslinking

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Condensation of ZFP207 and U1 snRNP promotes spliceosome assembly [RAP-seq]

Project description:U1 snRNP plays an essential role in initiating spliceosome assembly, yet the mechanism underlying its synergy with other splicing regulators for efficient spliceosome assembly remains elusive. Here we identify ZFP207 as a key regulator of U1 snRNP function that substantially promotes spliceosome assembly. Acute depletion of ZFP207 largely recapitulates the molecular phenotypes observed with the depletion of SNRNP70, a core component of U1 snRNP. Mechanistically, the N-terminal zinc finger domains of ZFP207 directly bind to U1 snRNA, while its C-terminus undergoes phase separation via intrinsically disordered regions (IDRs) to forms biomolecular condensates with U1 snRNP. These condensates create a crowded molecular environment that increases the local concentration of splicing snRNPs and regulators, thereby accelerating the speed of spliceosome assembly by facilitating interactions between U1 snRNP and other snRNPs. Collectively, our study demonstrates the critical role of phase separation in ensuring proper U1 snRNP function and efficient spliceosome assembly.

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