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Mutations in the NXF-1:NXT-1 mRNA export complex affect gene-expression driven by the hsp-16.41 promoter.

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New mutations in NXF-1 and NXT-1 genes suppress heat-shock lethality by affecting gene expression. These findings suggest a role for the NXF-1:NXT-1 complex in regulating heat-shock activated genes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The NXF-1:NXT-1 heterodimer is crucial for messenger RNA (mRNA) nuclear export.
  • Understanding gene regulation under stress conditions like heat shock is vital for cellular survival.

Purpose of the Study:

  • To investigate the function of the NXF-1:NXT-1 heterodimer in response to cellular stress.
  • To identify new genetic factors influencing heat shock gene expression and survival.

Main Methods:

  • Isolation of new alleles of nxf-1 and nxt-1 using forward genetics.
  • Assessing the effect of mutations on survival under heat shock conditions.
  • Analyzing gene expression changes using reporter constructs (P hsp-16.41 ::eGFP).

Main Results:

  • Three new nxf-1 alleles and one new nxt-1 allele were identified.
  • These mutations did not cause observable phenotypes under normal conditions.
  • Mutations partially suppressed lethality induced by PEEL-1 toxin expression under heat shock.
  • A decrease in P hsp-16.41 ::eGFP expression was observed in nxf-1 mutants.

Conclusions:

  • The NXF-1:NXT-1 complex plays a role in the expression of heat-shock activated genes.
  • This function may involve the recruitment of the hsp-16.41 promoter to the nuclear pore complex during heat shock.
  • NXF-1:NXT-1 influences cellular response to heat stress beyond its known role in mRNA export.