# SKN-1 isoform-c is essential for C. elegans development

## TL;DR

The study shows that the SKN-1c isoform is crucial for embryonic development in C. elegans, while the SKN-1a isoform is not.

## Contribution

This work identifies SKN-1c as essential for C. elegans development through targeted isoform-specific mutations.

## Key findings

- SKN-1c Met1Ala mutants produce inviable embryos requiring a balancer chromosome.
- SKN-1a Met1Ala mutants develop normally, indicating SKN-1c's unique role in embryogenesis.
- Embryos lacking maternal SKN-1c are developmentally arrested.

## Abstract

The transcription factor
SKN-1
in
Caenorhabditis elegans
is a critical regulator of various biological processes, impacting development, diet and immune responses, cellular detoxification, and lipid metabolism; thereby playing a pivotal role in regulating the health and lifespan of the organism. The primary isoforms of
SKN-1
(
SKN-1
a,
SKN-1
b, and
SKN-1
c) exhibit distinct functions resembling mammalian Nrf transcription factors. This study investigates the specific role of the
SKN-1
c isoform in development by generating mutants with targeted missense mutations in the

skn-1
c

and

skn-1
a

isoforms. The

skn-1
c Met1Ala

mutants, which replaces a start methionine with alanine, renders
SKN-1
c non-functional while preserving other isoforms, produced inviable embryos, requiring a balancer chromosome for proper embryonic development. In contrast,

skn-1
a Met1Ala

mutants, which replaces the start methionine with alanine for this isoform, displayed normal embryonic development and hatching. Moreover, the data suggest that
SKN-1
c plays a crucial role in embryonic development, as strains without maternally deposited
SKN-1
c lead to embryos that are developmentally arrested. Together, these findings contribute to our understanding of
SKN-1
c's specific role in influencing embryogenesis and development in
C. elegans.