A high-density genetic map and molecular sex-typing assay for gerbils

Area of Science:

• Genomics and Genetics
• Animal Model Development

Background:

• Mongolian gerbils (Meriones unguiculatus) are valuable research models.
• Accurate genetic mapping and sex determination are crucial for gerbil research.
• Existing methods for early-stage sex identification in gerbils are limited.

Purpose of the Study:

• To construct a high-density genetic map for Mongolian gerbils.
• To achieve a chromosome-level genome assembly.
• To develop a reliable method for early-stage sex determination in gerbils.

Main Methods:

• Genotyping 137 F2 gerbils using genotype-by-sequencing (GBS) at over 10,000 loci.
• Two-step genetic map construction using high-quality markers and genotype similarity.
• Assembly of genomic scaffolds into a chromosome-level map.
• Identification of sex chromosome scaffolds using genetic linkage and sequencing coverage.
• Design of a PCR-based sex determination assay.

Main Results:

• A robust genetic map of 1239 cM with 22 linkage groups was constructed.
• 1140 genomic scaffolds were assembled into a chromosome-level genome.
• A novel, internally-controlled PCR assay for sex determination was successfully developed.
• The assay enables accurate sex-typing of young and embryonic gerbils.

Conclusions:

• The high-density genetic map provides a valuable resource for gerbil genomics.
• The chromosome-level assembly advances the understanding of gerbil genome structure.
• The new PCR assay significantly improves early-stage sex determination in Mongolian gerbils, facilitating research.