# ARHGDIB Modulates Subcutaneous Fat Deposition in Ducks

## TL;DR

This study shows that the ARHGDIB gene helps control fat buildup in ducks, and reducing its activity leads to more fat storage, which could help improve duck meat quality.

## Contribution

ARHGDIB is newly identified as a negative regulator of subcutaneous adipogenesis in ducks through a metabolic-inflammatory network.

## Key findings

- ARHGDIB expression is lowest in duck fat and decreases during fat cell differentiation.
- Reducing ARHGDIB activity in duck fat cells increases lipid accumulation and alters gene expression in metabolic and inflammatory pathways.
- ARHGDIB knockdown upregulates PPARγ and LPL, key genes in fat formation.

## Abstract

Duck meat is a popular food, but too much fat beneath the skin can reduce its quality and make feeding less efficient. This study investigated a gene called ARHGDIB to understand its role in duck fat formation. We found that this gene is less active in fat tissue and its activity drops even further when fat cells are forming. By experimentally reducing the gene’s function in duck fat cells grown in the lab, we caused the cells to store more fat. This shows that ARHGDIB normally acts as a “brake” on fat formation. Understanding how this brake works could help breeders develop ducks with healthier levels of fat, leading to better meat quality for consumers.

Background: Subcutaneous fat deposition critically impacts duck meat quality and feed efficiency. ARHGDIB, a Rho GTPase regulator implicated in adipogenesis, remains functionally uncharacterized in poultry. Methods: We monitored growth and fat deposition in ducks from 30 to 70 days, performed transcriptomics on adipose tissue, and established an in vitro duck preadipocyte model to assess ARHGDIB function via siRNA knockdown, Oil Red O staining, and RNA-seq. Results: Fat deposition peaked at 50 days. ARHGDIB expression was lowest in fat and decreased during differentiation. Its knockdown significantly enhanced lipid accumulation, upregulated PPARγ and LPL, and altered the expression of 1681 genes enriched in oxidative phosphorylation, insulin/TLR signaling, and autophagy pathways. Conclusions: ARHGDIB acts as a novel negative regulator of duck subcutaneous adipogenesis by suppressing differentiation and modulating an integrated metabolic-inflammatory network, offering a potential target for precision breeding.