DNA strand intertwined with a marbled steak.

Decoding Meat Tenderness: How Genetics Can Lead to Better Beef

Mira Elwood monogram
Mira Elwood in Science & Nature October 2026 • 3 min read.

"Discover how variations in the CAPN1 and HRSP12 genes could unlock the secrets to more tender and flavorful beef, revolutionizing the meat industry."


For meat lovers, tenderness is key to a great dining experience. However, consistently achieving that perfect tenderness can be challenging. Selecting for this trait has long been difficult, but new genetic research is paving the way for more consistent and higher quality meat.

Proteins break down in a process called hydrolysis. This process is essential to muscle growth and influences meat tenderness after slaughter. Calpain I (CAPN1), a critical protease, plays a vital role in breaking down proteins in muscle fibers, directly impacting meat tenderness (Koohmaraie, 1996).

Scientists are focusing on genetic variants, particularly Single Nucleotide Polymorphisms (SNPs) within the CAPN1 gene, to uncover genetic markers linked to meat tenderness. The aim is to use this information to improve breeding programs and ultimately, the quality of beef.

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Why Tenderness Matters

Meat tenderness is shaped by biological and handling factors, so it can vary among cuts and animals. Genetics may contribute to that variation, but its precise impact depends on the traits being studied and the production context. A cautious approach is therefore needed when connecting genetic differences with eating quality.

Measuring Tenderness

Tenderness is commonly assessed through controlled evaluation of meat texture and eating quality. These approaches can help compare samples, but they may not capture every factor that affects a consumer's experience. Results should therefore be interpreted as measurements of particular conditions rather than universal predictions.

A Developing Field

Research into meat tenderness has developed alongside broader efforts to understand how animal biology affects food quality. Earlier work established that tenderness is not determined by appearance alone. Modern genetic research extends that perspective by examining whether inherited differences can help explain variation among animals.

What Makes Meat Tender? Unlocking the Genetic Code

DNA strand intertwined with a marbled steak.

Researchers have been studying CAPN1 and its activator, HRSP12, as key genes influencing meat tenderness. Prior studies show that CAPN1 variations affect tenderness, while HRSP12, located on bovine chromosome 19 (BTA 19), helps stimulate Calpain1 activity. Understanding both genes could provide a more complete picture of the genetic factors influencing meat quality.

A recent study examined SNPs in 323 cattle from nine different breeds to find associations between these genetic markers and carcass traits. The goal was to pinpoint genetic markers that could help predict and improve meat quality.

  • A3553G and T824C Loci: Specific locations on the genes were found to correlate with marbling and tenderness.
  • Double Homozygotes: Cattle with specific pairings of homozygous genes (AA/TT, AA/CC, AG/TT, GG/TT) exhibited higher marbling scores.
  • Genetic Influence: The study suggests that variations in CAPN1 and HRSP12 are important genetic factors influencing meat quality.
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What Meat Includes

The term meat primarily refers to skeletal muscle together with associated fat and connective tissue, although it can also include edible organs such as liver and kidney. Commonly recognized types include beef, chicken, lamb, goat, pork, turkey, duck, fish, rabbit, and shrimp. Britannica reports that meat fat varies by species, quality, and cut, and can influence the flavour, juiciness, and tenderness of lean meat. These definitions and distinctions provide context for studying tenderness in beef rather than treating all meat products as identical.

Limits of Generalization

A broad marketplace contains substantially different meat products, including canned tuna, sausages, and beef jerky. Because these products differ in form and preparation, observations about one should not automatically be generalized to fresh beef tenderness. The available source illustrates product diversity but does not establish that genetics improves tenderness across all categories. Claims about genetic effects therefore require evidence specific to the beef product and trait being evaluated.

Comparing Beef Carefully

Comparisons of beef tenderness should distinguish among species, cuts, fat levels, and preparation conditions. Genetic differences may be informative, but they are only one possible source of variation. A fair comparison should use consistent definitions and measurements across the groups being studied. Without that consistency, apparent differences may reflect the sample or method rather than genetics.

The study highlighted that the A3553G and T824C loci are key areas influencing meat quality. Cattle with the AA genotype at the A3553G locus showed higher marbling scores and tenderness. Similarly, specific combinations of CAPN1 and HRSP12 genotypes resulted in superior marbling.

Looking Ahead: The Future of Beef Quality

This research opens doors for further exploration of how CAPN1 and HRSP12 influence meat quality. By identifying and selecting for favorable genetic traits, breeders can produce cattle that consistently yield more tender and flavorful beef. This advancement promises to enhance consumer satisfaction and drive innovation in the meat industry.

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A Measured Interpretation

Genetics offers a promising way to investigate why beef tenderness varies, but it should be considered alongside the physical characteristics of the meat. The strongest conclusions will come from studies that connect inherited traits with clearly defined tenderness outcomes. Until that evidence is consistent, genetic findings are best treated as useful guidance rather than a complete explanation.

Toward Better Prediction

Future work may focus on improving the ability to predict tenderness before beef reaches the consumer. Progress will depend on linking genetic information with reliable measurements and practical production decisions. Such efforts could make selection more targeted while reducing uncertainty about final eating quality. The scale and usefulness of these advances remain dependent on further validation.

Beyond Genetics

Improving beef tenderness is a systems problem rather than a genetics-only challenge. Biological variation, meat composition, processing, and preparation can all influence the result. Research that isolates only one factor may provide an incomplete picture. Broader evaluation is needed before genetic selection can be judged on its real-world value.

Quality at the Table

Consumers experience tenderness through the combined effects of the animal, the cut, and how the meat is prepared. Genetic information could eventually help producers offer more consistent beef, but consistency must be judged by actual eating experiences. Practical benefits will depend on whether scientific predictions translate into meat that people perceive as more tender. That connection should remain central to evaluating the technology.

How tenderness markers compare across cattle research

A separate analysis of five Bos taurus breeds attributed only a small share of observed WBSF variation to calpastatin and μ-calpain gene variation, despite their prominent role in tenderness research. The contrast shows that a gene can be biologically relevant without explaining much of the variation measured across animals.[1]

Reading genetic associations without overextending them

Together, these findings show why tenderness genetics is difficult to reduce to a single marker: measured effects can be modest, differ by variant or muscle, and account for only part of the observed trait variation. The genetic signal is therefore meaningful as one component of a complex trait, not a complete explanation of meat tenderness.[1] [2] [3]

Associations that recur across breeds are not guaranteed to appear consistently in every breed. One multi-breed analysis found that only a subset of associated genomic regions appeared in all breeds examined, while another sensory-trait analysis identified only one marker meeting its stringent significance threshold; sample size and marker coverage can affect what is detected.[4] [5]

Questions for evaluating tenderness markers

  • Would the same marker associations hold across breeds, given that many associated regions were not detected consistently in every breed examined?[4]
  • How much of the measured tenderness variation can be attributed to inherited differences when environmental influences also shape meat-quality traits?[1] [3]

Terms used in tenderness research

Proteolysis
Breakdown of proteins[2]

Sources

  1. Genome wide association and gene enrichment analysis reveal membrane anchoring and structural proteins associated with meat quality in beef (link.springer.com)
  2. Validation Study of SNPs in CAPN1-CAST Genes on the Tenderness of Muscles (Longissimus thoracis and Semimembranosus) in Hanwoo (Korean Cattle) (pmc.ncbi.nlm.nih.gov)
  3. Whole Genome Sequence Data Provides Novel Insights Into the Genetic Architecture of Meat Quality Traits in Beef (www.frontiersin.org)
  4. Genome-wide association analysis for quantitative trait loci influencing Warner–Bratzler shear force in five taurine cattle breeds (pmc.ncbi.nlm.nih.gov)
  5. Genome-wide Association Study for Warner-Bratzler Shear Force and Sensory Traits in Hanwoo (Korean Cattle) (pmc.ncbi.nlm.nih.gov)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

Everything You Need To Know

1

What specific genes are primarily responsible for influencing meat tenderness in beef, according to this research?

The research highlights two key genes: *CAPN1* and *HRSP12*. *CAPN1*, or Calpain I, is a protease that breaks down proteins in muscle fibers, directly influencing meat tenderness. *HRSP12* is its activator, located on bovine chromosome 19 (BTA 19), which stimulates *CAPN1* activity. Both of these genes are critical to understanding and predicting beef quality.

2

How do variations in the CAPN1 gene impact meat tenderness, and what are scientists studying in relation to this gene?

Variations within the *CAPN1* gene, specifically Single Nucleotide Polymorphisms (SNPs), directly affect meat tenderness by influencing the breakdown of proteins in muscle fibers. Scientists are studying these SNPs to identify genetic markers that correlate with tenderness. By understanding these markers, they aim to improve breeding programs, ultimately leading to beef with more consistent and higher quality.

3

What role does the HRSP12 gene play in meat tenderness, and how does it interact with CAPN1?

*HRSP12* is an activator of *CAPN1*. Located on bovine chromosome 19 (BTA 19), it stimulates the activity of *CAPN1*. While *CAPN1* directly breaks down proteins impacting tenderness, *HRSP12* assists by promoting *CAPN1*'s function, and understanding both genes provide a complete picture of genetic factors influencing meat quality.

4

Besides CAPN1 and HRSP12, what other specific genetic locations (loci) were found to correlate with meat quality, and what were the key findings related to those locations?

The study identified the *A3553G* and *T824C* loci within the genes as specific locations correlating with marbling and tenderness. Cattle with the *AA* genotype at the *A3553G* locus showed higher marbling scores and tenderness. Additionally, specific combinations of *CAPN1* and *HRSP12* genotypes resulted in superior marbling. This indicates that specific pairings of homozygous genes (AA/TT, AA/CC, AG/TT, GG/TT) exhibited higher marbling scores.

5

How can the understanding of CAPN1 and HRSP12 be used to improve beef quality, and what are the potential benefits for the meat industry and consumers?

By identifying and selecting for favorable genetic traits within *CAPN1* and *HRSP12*, breeders can produce cattle that consistently yield more tender and flavorful beef. This involves using genetic markers to predict and improve meat quality. This approach promises to enhance consumer satisfaction by providing a more enjoyable dining experience and can drive innovation in the meat industry by enabling the development of targeted breeding strategies to meet consumer demand for high-quality beef.

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