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Home / Equine Research Bank / Genes (Basel) / Genetic Composition of Polish Hucul Mare Families: mtDNA Div...
Genes2024; 15(12); 1607; doi: 10.3390/genes15121607

Genetic Composition of Polish Hucul Mare Families: mtDNA Diversity.

Abstract: The Hucul horse breed formed in the region of the Eastern Carpathians, likely through the natural crossbreeding of oriental horses. After World War II, their population significantly decreased, leading to the breeding being based on only 14 female lines, whose founders often had unknown origins. To preserve the breed's unique characteristics, it is now part of a Genetic Resources Conservation Program, which prioritizes the maintenance of genetic diversity. This study aims to clarify the maternal relatedness of founder mares and assess genetic diversity using mitochondrial DNA (mtDNA). The hyper-variable region of the mitochondrial genome was analyzed in 57 horses. Pedigree records were used to trace genealogical lines, and molecular analysis focused on identifying maternal relationships between founder mares. The analysis revealed close maternal kinships between the lines of Jagoda and Bajkałka, as well as Sekunda and Sroczka. In the Hucul population, seventeen mitochondrial haplotypes were identified, with three that did not match any established lines. The findings reveal discrepancies between pedigree records and mitochondrial DNA data, suggesting potential inaccuracies in the Hucul horse studbook. The findings highlight the importance of combining pedigree and molecular data to refine strategies to preserving genetic diversity, minimizing inbreeding, and improving the management the Genetic Resources Conservation Program.
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Publication Date: 2024-12-17 PubMed ID: 39766874PubMed Central: PMC11675560DOI: 10.3390/genes15121607Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

Genetic Composition of Polish Hucul Mare Families: mtDNA Diversity.

Overview of the Research

  • This study investigated the maternal genetic diversity of Polish Hucul horses by analyzing mitochondrial DNA (mtDNA) from different mare families.
  • The aim was to clarify maternal relatedness among founder mares and assess genetic diversity within this breed, which has a limited number of female lines since World War II.

Background and Importance

  • The Hucul horse breed originated in the Eastern Carpathians, developed through natural crossbreeding, particularly involving oriental horses.
  • After World War II, the population sharply declined and breeding was reduced to only 14 female founder lines, some with unknown origins.
  • Maintaining genetic diversity is crucial for conserving breed characteristics and avoiding inbreeding complications.
  • The Hucul breed is currently part of a Genetic Resources Conservation Program aimed at preserving these unique genetic traits.

Research Objectives

  • To examine maternal relatedness among founder mares by analyzing mitochondrial DNA, which is maternally inherited and useful for tracing maternal lineage.
  • To evaluate genetic diversity within the breed based on mtDNA variation.
  • To compare molecular findings with pedigree records to identify potential inaccuracies or discrepancies in existing studbooks.

Methodology

  • The study analyzed the hyper-variable region of the mitochondrial genome from 57 individual Hucul horses.
  • Pedigree records were thoroughly examined to trace genealogical female lines corresponding to each sampled horse.
  • Molecular analysis focused on identifying unique mitochondrial haplotypes and relationships between founder mare lines.

Key Findings

  • Maternal kinships were confirmed between several mare lines, particularly between Jagoda and Bajkałka, and also between Sekunda and Sroczka, indicating closer maternal relations than suggested by pedigree data.
  • A total of seventeen distinct mitochondrial haplotypes were identified within the population.
  • Three of these haplotypes did not correspond to any established founder lines, implying the existence of unrecorded maternal origins or inaccuracies in studbook data.
  • There were notable discrepancies between pedigree-based assignments and genetic relationships derived from mtDNA data.

Implications of the Research

  • The study highlights the limitations of relying solely on pedigree records to assess genetic diversity and relatedness.
  • Molecular data such as mtDNA analysis provides valuable insight to verify and refine pedigree information.
  • Combining genetic and pedigree information can improve strategic breeding decisions aimed at preserving diversity and minimizing inbreeding.
  • The results support enhancing the Genetic Resources Conservation Program with molecular tools to better manage and conserve the Hucul horse genetic pool.

Conclusions

  • MtDNA analysis revealed previously unrecognized maternal relationships and haplotype diversity within Polish Hucul mares.
  • The discrepancies between genetic data and pedigree records call for the revision and improvement of studbook accuracy.
  • Integrating molecular genetics into breed conservation programs is essential to maintaining the health and uniqueness of endangered breeds like the Hucul horse.

Cite This Article

APA
Błaszczak A, Stefaniuk-Szmukier M, Długosz B, Musiał AD, Olczak K, Ropka-Molik K. (2024). Genetic Composition of Polish Hucul Mare Families: mtDNA Diversity. Genes (Basel), 15(12), 1607. https://doi.org/10.3390/genes15121607

Publication

Genes
ISSN: 2073-4425
NlmUniqueID: 101551097
Country: Switzerland
Language: English
Volume: 15
Issue: 12
PII: 1607

Researcher Affiliations

Błaszczak, Aleksandra
  • Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture, al. Mickiewicza 24/28, 30-059 Cracow, Poland.
  • Department of Animal Molecular Biology, National Research Institute of Animal Production, Krakowska 1, 32-083 Balice, Poland.
Stefaniuk-Szmukier, Monika
  • Department of Animal Molecular Biology, National Research Institute of Animal Production, Krakowska 1, 32-083 Balice, Poland.
Długosz, Bogusława
  • Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture, al. Mickiewicza 24/28, 30-059 Cracow, Poland.
Musiał, Adrianna Dominika
  • Department of Animal Molecular Biology, National Research Institute of Animal Production, Krakowska 1, 32-083 Balice, Poland.
Olczak, Katarzyna
  • Department of Farm Animal Biodiversity Conservation and Horse Breeding, National Research Institute of Animal Production, Krakowska 1, 32-083 Balice, Poland.
Ropka-Molik, Katarzyna
  • Department of Animal Molecular Biology, National Research Institute of Animal Production, Krakowska 1, 32-083 Balice, Poland.

MeSH Terms

  • Animals
  • Horses / genetics
  • DNA, Mitochondrial / genetics
  • Female
  • Pedigree
  • Genetic Variation
  • Haplotypes
  • Poland
  • Genome, Mitochondrial / genetics
  • Breeding

Conflict of Interest Statement

The authors declare no conflicts of interest.

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