Endoplasmic reticulum proteins impact penetrance in a pink1-mutant Drosophila model
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1214414 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR32086600.fastq.gz | Fastqsanger.gz | |||
| SRR32086601.fastq.gz | Fastqsanger.gz | |||
| SRR32086602.fastq.gz | Fastqsanger.gz | |||
| SRR32086603.fastq.gz | Fastqsanger.gz | |||
| SRR32086604.fastq.gz | Fastqsanger.gz |
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Project description:Parkinson’s disease (PD) is a neurodegenerative disorder with a high variability of age at onset, disease severity, and progression. This suggests that other factors, including genetic, environ-mental, or biological factors, are at play in PD. Loss of PINK1 causes a recessive form of PD and is typically fully penetrant; however, it features a wide range in disease onset, further supporting the existence of protective factors, endogenous or exogenous, to play a role. Loss of Pink1 in Drosophila melanogaster results in locomotion deficits, also observed in PINK1-related PD in humans. In flies, Pink1 deficiency induces defects in the ability to fly; none-theless, around ten percent of the mutant flies are still capable of flying, indicating that advanta-geous factors affecting penetrance also exist in flies. Here, we aimed to identify the mechanisms underlying this reduced penetrance in Pink1-deficient flies. We performed genetic screening in pink1-mutant flies to identify RNA expression alterations affecting the flying ability. The most important biological processes involved were transcription-al and translational activities, endoplasmic reticulum (ER) regulation, and flagellated movement and microtubule organization. We validated 2 ER-related proteins, zonda, and windbeutel, to positively affect the flying ability of Pink1-deficient flies. Thus, our data suggest that these pro-cesses are involved in the reduced penetrance and that influencing them may be beneficial for Pink1 deficiency.
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Project description:In eukaryotes, up to one-third of cellular proteins are targeted to the endoplasmic reticulum, where they undergo folding, processing, sorting and trafficking to subsequent endomembrane compartments. Targeting to the endoplasmic reticulum has been shown to occur co-translationally by the signal recognition particle (SRP) pathway or post-translationally by the mammalian transmembrane recognition complex of 40 kDa (TRC40) and homologous yeast guided entry of tail-anchored proteins (GET) pathways. Despite the range of proteins that can be catered for by these two pathways, many proteins are still known to be independent of both SRP and GET, so there seems to be a critical need for an additional dedicated pathway for endoplasmic reticulum relay. We set out to uncover additional targeting proteins using unbiased high-content screening approaches. To this end, we performed a systematic visual screen using the yeast Saccharomyces cerevisiae, and uncovered three uncharacterized proteins whose loss affected targeting. We suggest that these proteins work together and demonstrate that they function in parallel with SRP and GET to target a broad range of substrates to the endoplasmic reticulum. The three proteins, which we name Snd1, Snd2 and Snd3 (for SRP-independent targeting), can synthetically compensate for the loss of both the SRP and GET pathways, and act as a backup targeting system. This explains why it has previously been difficult to demonstrate complete loss of targeting for some substrates. Our discovery thus puts in place an essential piece of the endoplasmic reticulum targeting puzzle, highlighting how the targeting apparatus of the eukaryotic cell is robust, interlinked and flexible.
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