Sheep TERT variants emerge as possible markers for wool traits
Bottom line
Researchers in China report that the sheep TERT gene, which encodes telomerase reverse transcriptase, may be a new candidate marker for wool-related breeding decisions. In the Animals study, Fangfang Zhao, Zhaohua He, and Huitong Zhou characterized the ovine TERT gene, identified six single-nucleotide polymorphisms across four exons, and linked some of that variation to measured wool traits using KASP genotyping and in situ hybridization. The work builds on prior evidence that TERT is involved in hair follicle induction, activation, and growth in other species, and adds sheep-specific data suggesting the gene may also play a role in follicle development and fleece characteristics. (pubmed.ncbi.nlm.nih.gov)
Why it matters: For veterinary and animal production professionals, this is early-stage genetics research, not a practice-changing finding. But it adds to a growing body of sheep genomics work looking beyond classic keratin and keratin-associated protein targets toward broader regulators of follicle biology, including genes tied to cell proliferation and developmental signaling. If the associations hold up in larger and more diverse flocks, TERT-linked markers could eventually support more precise selection for wool quality traits, though any breeding use would need to be balanced against whole-animal performance and reproduction goals. (pubmed.ncbi.nlm.nih.gov)
What to watch: Validation in larger populations, breed-specific replication, and whether TERT moves from a candidate gene into commercial wool-selection panels will determine whether this finding has practical value. (pubmed.ncbi.nlm.nih.gov)
Key facts
- Study type
- Sheep genetics study
- Journal
- Animals
- Gene
- TERT, telomerase reverse transcriptase
- Main finding
- Six single-nucleotide polymorphisms were identified across four exons
- Association
- Some TERT variants were linked to measured wool traits
- Methods
- KASP genotyping and in situ hybridization
- Biological context
- TERT is involved in hair follicle induction, activation, and growth in other species
- Interpretation
- TERT may be a candidate marker for wool-related breeding decisions
A new sheep genetics study in Animals puts TERT, the telomerase reverse transcriptase gene, on the list of candidate markers linked to wool traits. The authors report molecular characterization of ovine TERT, detection of six SNPs across four exons, and associations between some variants and fleece-related measures, using KASP genotyping alongside in situ hybridization to examine gene expression in skin and follicle tissues. The finding is notable because TERT is better known for its role in telomere maintenance and cell proliferation than for direct use in livestock selection. (pubmed.ncbi.nlm.nih.gov)
The study fits into a broader push to map the genetic architecture of wool production in fine-wool sheep. Over the past several years, researchers have identified candidate loci affecting fibre diameter, staple length, fleece weight, and related traits through GWAS, transcriptomics, and targeted candidate-gene studies. That work has included keratin-associated proteins, developmental regulators, and genes involved in follicle cycling and skin biology, reflecting how complex wool traits really are. (pubmed.ncbi.nlm.nih.gov)
TERT is a biologically plausible candidate in that context. In other systems, telomerase activity is tied to proliferative capacity, and prior sheep skin transcriptome work has already flagged TERT among genes potentially involved in wool fineness regulation. A 2024 study from overlapping authors in Genomics identified TERT among potential target genes connected to wool growth and fineness in Gansu alpine fine-wool sheep, which gives this newer paper some additional mechanistic context rather than making it a one-off association report. (pubmed.ncbi.nlm.nih.gov)
The wider literature also suggests the field is moving toward increasingly granular marker discovery. Recent papers have examined genes such as NOTCH2, CD1A, FAT3, and members of the KRTAP family for links to wool phenotypes, while newer genome resources, including a telomere-to-telomere sheep assembly, are helping uncover variants in previously unresolved regions associated with wool fineness. In that sense, the TERT paper is part of a larger transition from broad trait mapping to more specific, potentially usable molecular markers. (pubmed.ncbi.nlm.nih.gov)
Independent expert reaction specific to this paper was not readily visible in public sources, but review articles on wool genetics point to the same cautionary theme: marker-assisted selection can be useful, yet wool traits are polygenic and can involve trade-offs with growth, reproduction, or other economically important outcomes. One recent review in Animals emphasized the need for balanced breeding approaches as marker-based programs expand, rather than selecting narrowly for a single fleece characteristic. (mdpi.com)
Why it matters: For veterinary professionals working with sheep enterprises, the immediate clinical impact is limited, but the herd-health and production relevance is real. Genomic tools that improve flock-level selection for fleece quality could influence breeding plans, replacement decisions, and long-term economic performance for wool-focused operations. At the same time, these findings are best viewed as research-stage signals until they are replicated across breeds and integrated with practical selection indexes that account for health, fertility, and overall productivity. (pubmed.ncbi.nlm.nih.gov)
This also matters because follicle biology increasingly overlaps with veterinary interests beyond fibre economics. Better understanding of genes that regulate follicle development may eventually inform comparative work on skin biology, coat disorders, and regenerative pathways, even if that translational step is still speculative. Here, that’s an inference from TERT’s known role in proliferative biology and the expanding sheep hair follicle literature, not a direct claim from the paper itself. (mdpi.com)
What to watch: The next steps are straightforward: replication in larger and genetically distinct sheep populations, clearer reporting on effect sizes for specific wool traits, and eventual testing of whether TERT variants improve prediction when added to existing genomic selection models. If that happens, the gene could become one more piece of a multi-marker approach rather than a standalone answer for wool improvement. (pubmed.ncbi.nlm.nih.gov)