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Functional interactions between the ciliopathy-associated Meckel syndrome 1 (MKS1) protein and two novel MKS1-related

Nathan J Bialas1, Peter N Inglis, Chunmei Li

  • 1Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.

Journal of Cell Science
|February 12, 2009
PubMed

Insights

Researchers identified a novel protein family, MKS-1-related proteins 1 and 2 (MKSR-1, MKSR-2), crucial for basal body function in ciliopathies like Meckel syndrome. Their interactions impact lifespan and insulin signaling.

Area of Science:

  • Cell Biology
  • Genetics
  • Developmental Biology

Background:

  • Meckel syndrome (MKS) is a ciliopathy with diverse clinical manifestations.
  • MKS1, an MKS-associated protein, features a B9 domain of unknown function.
  • A family of B9-domain-containing proteins exists in ciliated organisms.

Purpose of the Study:

  • To investigate the function and localization of the B9-domain-containing protein family.
  • To explore the role of these proteins in ciliogenesis and Meckel syndrome.
  • To understand the functional relationships between MKS-1, MKSR-1, and MKSR-2.

Main Methods:

  • Phylogenetic analysis to identify B9-domain protein family.
  • Subcellular localization studies in *Caenorhabditis elegans* and human cells.
  • Genetic disruption (mutant generation) in *C. elegans* to assess phenotypic effects.
  • Analysis of genetic interactions and insulin-IGF-I signaling pathways.

Main Results:

  • B9-domain proteins (MKS-1, MKSR-1, MKSR-2) localize to basal bodies/transition zones of cilia in a co-dependent manner.
  • Human orthologues MKSR1 and MKSR2 are essential for ciliogenesis.
  • *C. elegans* mks/mksr mutants exhibit genetic interactions affecting lifespan via insulin-IGF-I signaling, despite lacking overt ciliary defects.

Conclusions:

  • A novel family of basal body/ciliary proteins (MKS-1, MKSR-1, MKSR-2) with conserved function has been identified.
  • These proteins play a role in ciliogenesis and are functionally interconnected.
  • Interactions within this protein family influence lifespan and insulin signaling, offering new insights into Meckel syndrome etiology.

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