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Gene expression during testis development in Duroc boars.

S Lervik¹, A B Kristoffersen², L N Conley³

¹1Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine and Biosciences,Norwegian University of Life Sciences (NMBU),Ullevålsveien 72,Pb 8146 Dep,N-0033 Oslo,Norway.

Animal : an International Journal of Animal Bioscience

|May 29, 2015

Summary

This summary is machine-generated.

Breeding pigs to reduce androstenone odor may delay puberty. Gene expression analysis in boar testes reveals complex age-dependent pathways influencing development, crucial for selecting optimal traits for genetic improvement.

Keywords:

boar testis gene expression pathway analysis pubertal testis development

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Area of Science:

Reproductive biology
Molecular genetics
Animal science

Background:

Androstenone, a steroid pheromone, influences boar meat odor.
Breeding against androstenone can cause delayed puberty onset.
Understanding gene expression is key to resolving this trade-off.

Purpose of the Study:

To investigate the causality between androstenone breeding and delayed puberty.
To analyze global gene expression in developing boar testes.
To correlate gene expression with morphological and androgenic development.

Main Methods:

Porcine cDNA microarray analysis of boar testes at 12, 16, 20, and 27 weeks.
Analysis of gene and pathway expression in relation to prior morphological and androgenic data.
Identification of differentially expressed gene clusters and functional pathways.

Main Results:

Nine gene clusters and 49 functional charts showed significant differential expression over time.
Prepubertal testes showed pathways for tissue renewal and cell respiration.
Pubertal development involved MAPK, STAR, STARD6, cholesterol transport, and meiotic pathways.
Evidence of a neuromorphogenesis period with neurosteroid and redox pathway changes.
Growth factors increased with testis maturation, potentially interacting with MAPK and STAR pathways.

Conclusions:

Boar testis development involves age-specific pathways for neurogenesis, morphology, and growth factors.
These pathways modulate steroidogenesis and gonadotropins.
Genetic selection for low androstenone must consider age-dependent gene expression to avoid unintended consequences like delayed puberty.