The Claim
The expression of β,β'-carotene-15,15'-oxygenase mRNA in the liver and duodenum is equivalent between cattle with yellow fat and cattle with white fat, indicating that transcriptional regulation does not account for differences in enzyme activity between these groups.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Cattle with yellow fat and cattle with white fat have the same levels of β,β'-carotene-15,15'-oxygenase mRNA in their liver and duodenum, meaning differences in enzyme activity are not caused by differences in gene transcription.
See the scientific wording
The expression of β,β'-carotene-15,15'-oxygenase mRNA in the liver and duodenum does not differ between cattle with yellow and white fat, indicating that transcriptional regulation is not responsible for observed differences in enzyme activity.
The liver makes the same amount of the gene message for the enzyme that breaks down beta-carotene in both yellow-fat and white-fat cattle, but the enzyme works more strongly in white-fat cattle because it lasts longer or gets activated more, so less beta-carotene builds up in their fat. In yellow-fat cattle, the enzyme breaks down faster or stays inactive, so more beta-carotene stays in the blood and gets stored in fat, turning it yellow.
What the research says
1 studyCows with yellow fat and cows with white fat make the same amount of the gene message for the enzyme that breaks down beta-carotene, so the difference in how much enzyme they have isn't because of the gene being turned up or down—it must be something else, like how the enzyme is used or kept alive.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.