DPY-17 and MUA-3 Interact for Connective Tissue-Like Tissue Integrity in Caenorhabditis elegans: A Model for Marfan Syndrome.
G3 (Bethesda)
; 5(7): 1371-8, 2015 Apr 27.
Article
em En
| MEDLINE
| ID: mdl-25917920
ABSTRACT
mua-3 is a Caenorhabditis elegans homolog of the mammalian fibrillin1, a monogenic cause of Marfan syndrome. We identified a new mutation of mua-3 that carries an in-frame deletion of 131 amino acids in the extracellular domain, which allows the mutants to survive in a temperature-dependent manner; at the permissive temperature, the mutants grow normally without obvious phenotypes, but at the nonpermissive temperature, more than 90% die during the L4 molt due to internal organ detachment. Using the temperature-sensitive lethality, we performed unbiased genetic screens to isolate suppressors to find genetic interactors of MUA-3. From two independent screens, we isolated mutations in dpy-17 as a suppressor. RNAi of dpy-17 in mua-3 rescued the lethality, confirming dpy-17 is a suppressor. dpy-17 encodes a collagen known to genetically interact with dpy-31, a BMP-1/Tolloid-like metalloprotease required for TGFß activation in mammals. Human fibrillin1 mutants fail to sequester TGFß2 leading to excess TGFß signaling, which in turn contributes to Marfan syndrome or Marfan-related syndrome. Consistent with that, RNAi of dbl-1, a TGFß homolog, modestly rescued the lethality of mua-3 mutants, suggesting a potentially conserved interaction between MUA-3 and a TGFß pathway in C. elegans. Our work provides genetic evidence of the interaction between TGFß and a fibrillin homolog, and thus provides a simple yet powerful genetic model to study TGFß function in development of Marfan pathology.
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Assunto principal:
Moléculas de Adesão Celular
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Caenorhabditis elegans
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Tecido Conjuntivo
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Proteínas de Caenorhabditis elegans
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Colágenos não Fibrilares
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Síndrome de Marfan
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article