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The Joubert syndrome protein CEP41 is excluded from the distal segment of cilia in C. elegans.

PMID: 34113804 (view PubMed database entry)
DOI: 10.17912/micropub.biology.000406 (read at publisher's website )
PMCID: PMC8185565 (free full text version available)

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Sebiha Cevik, Oktay I Kaplan,

Rare diseases are a fundamental issue in today's world, affecting more than 300 million individuals worldwide. According to data from Orphanet and OMIM, about 50-60 new conditions are added to the list of over 6,000 clinically distinct diseases each year, rendering disease diagnosis and treatment even more challenging. Ciliopathies comprise a heterogeneous category of rare diseases made up of over 35 distinct diseases, including Joubert syndrome (JBTS; OMIM 213300), that are caused by functional and structural defects in cilia. JBTS is an autosomal recessive condition characterized by a range of symptoms, including cerebellar vermis hypoplasia and poor muscle tone. There are now a total of 38 genes that cause JBTS, almost all of which encode protein products that are found in cilia and cilia-associated compartments, such as the basal body and transition zone. CEP41 is a JBTS-associated protein that is found in cilia and the basal body of mammals, but its localization in other ciliary organisms remains elusive. <i>C. elegans</i> is an excellent model organism for studying the molecular mechanisms of rare diseases like JBTS. We, therefore, decided to use <i>C. elegans</i> to identify the localization of CEP41. Our microscopy analysis revealed that CEPH-41(CEntrosomal Protein Homolog 41) not only localizes to cilia but is excluded from the distal segment of the amphid and phasmid cilia in <i>C. elegans</i>. Furthermore, we discovered a putative X-box motif located in the promoter of <i>ceph-41</i> and the expression of <i>ceph-41</i> is regulated by DAF-19, a sole Regulatory Factor X (RFX) transcription factor.

MicroPubl Biol (microPublication biology)
[2021, 2021:]

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