A recent paper in Cell Reports by Huang et al. titled, “Evidence for reduced BRCA2 functional activity in Homo sapiens after divergence from the chimpanzee-human last common ancestor,” is being presented as a window into human evolution. The study identifies a specific genetic variant in the vital DNA-repair gene BRCA2 that is unique to and fixed in humans, and which results in a less efficient version of the protein compared to that found in chimpanzees and other primates. While the paper’s data is sound, its evolutionary interpretation is a textbook case of confusing degeneration with progress. Far from providing evidence for the creative power of an unguided process, the paper documents a clear, measurable instance of genetic decay—a finding that directly contradicts the requirements of molecules-to-man evolution and powerfully affirms the principle of Genetic Entropy.
A Fair Summary of the Research
The authors performed a comparative genetic analysis of 401 cancer-related genes across humans and 12 non-human primate species. They identified hundreds of human-specific amino acid substitutions, focusing on one in particular: a change from methionine (M) to threonine (T) at codon 2662 of the BRCA2 gene (BRCA2M2662T). The BRCA2 protein is a critical component of the cell’s machinery for repairing DNA double-strand breaks (DSBs), one of the most dangerous forms of genetic damage.
Through a series of meticulous lab experiments, Huang et al. demonstrated that this single human-specific substitution has significant functional consequences. They found that the human version of the protein (BRCA2-T) binds less effectively to its essential partners, DSS1 and RAD51, compared to the ancestral primate version (BRCA2-M). This weakened interaction translates directly into a functional deficit: using a DSB repair assay, they showed that the human BRCA2 variant triggers a ~20% reduction in recombinational DNA repair ability. The authors frame this loss of function as a human-specific trait that became fixed in our lineage after splitting from a common ancestor with chimpanzees.
The Core Analysis: A Case Study in Adaptive Degeneration
The central claim of neo-Darwinian evolution is that the mechanism of random mutation and natural selection has the creative power to build the vast, specified information required for new genes, new proteins, and new body plans. The findings of Huang et al. provide evidence for the exact opposite. The human-specific BRCA2 variant is not a construction; it is a degradation. A 20% reduction in the efficiency of a critical DNA repair system is a net loss of pre-existing, sophisticated function. This is devolution, not evolution.
This finding is a perfect illustration of the principle of Genetic Entropy, which states that the genomes of all complex organisms are relentlessly and inevitably accumulating deleterious mutations, leading to a steady decay of genetic information over time. Natural selection is powerless to stop this process because the vast majority of these mutations, like the BRCA2 variant, have fitness effects that are too small to be efficiently selected against. They are “nearly neutral” and accumulate like rust, slowly degrading the organism’s original, complex design.
The evolutionary paradigm struggles to explain why a damaging mutation that compromises genomic integrity would become “fixed” in the entire human population. The authors themselves allude to a study suggesting a possible link between BRCA mutations and increased fertility, a classic case of antagonistic pleiotropy. While this is speculative, it aligns perfectly with what Dr. Michael Behe calls “The First Rule of Adaptive Evolution”: the quickest and easiest way for an organism to adapt is to break or blunt a pre-existing gene. Even if this less-efficient BRCA2 variant conferred some short-term reproductive advantage, the mechanism is still one of degradation. It is burning the furniture to heat the house. This is adaptive degeneration, a process that can explain small-scale, short-term changes but is a creative dead end, incapable of building the new, integrated systems that macroevolution requires.
The study inadvertently highlights the central failure of the evolutionary mechanism. If the “evolution” that defines our species consists of breaking things, then the story of unguided progress from a simple cell to man is fundamentally falsified. The evidence demonstrates a process of decay, precisely as predicted by a model of an originally “very good” creation now subject to the universal tendency toward disorder described by the Second Law of Thermodynamics and the biblical Curse.
The Alternative Explanation: Common Design and Recent Origin
When analyzed using the forensic methods of historical science, which seeks the best explanation for past events, the evidence from Huang et al. points away from unguided evolution and toward intelligent design within a recent, biblical timescale.
- Homology as Common Design, Not Common Ancestry: The similarity between human and primate BRCA2 genes is not a surprise. An intelligent engineer, when designing different models, will naturally reuse successful design components. A high-performance DNA repair system is a brilliant design module. The difference at codon 2662 is better understood not as an evolutionary “emergence” but as a post-creation modification. Given that it is a loss of function, it is best interpreted as a degenerative mutation that has occurred specifically in the human lineage since the Fall.
- The Timescale Crisis: The paper’s entire narrative rests on the unquestioned assumption of a “chimpanzee-human last common ancestor” millions of years ago. This timeline is an artifact of evolutionary models that use inferred, slow molecular clock rates. However, when we use the empirically measured, pedigree-based mutation rates observed in living humans (~100 new mutations per person per generation), the timeline for the origin of the entire human family collapses to approximately 6,000 years. This real-world data falsifies the deep-time narrative. The BRCA2M2662T variation did not arise millions of years ago; it arose recently in a small, bottlenecked population, which allowed a slightly deleterious mutation to drift to fixation—a perfect description of the human population dispersing from the Tower of Babel.
- The Biblical Framework as a Scientific Model: The Genesis account provides a superior scientific model that predicts the very phenomena observed in this paper.
- Creation: A “very good” creation implies that the original human genome, including BRCA2, was free from defects and functioned at peak efficiency.
- The Fall & Curse: The introduction of sin, death, and decay into the world provides the specific historical and theological cause for the onset of Genetic Entropy. The degradation of a vital DNA repair system is a direct, expected consequence.
- The Babel Bottleneck: The dispersion from Babel created small, isolated populations where slightly deleterious mutations, invisible to selection, could easily become fixed through genetic drift. The fixation of the less-efficient BRCA2-T variant is not a mystery to be explained by contorted evolutionary scenarios; it is a clear signature of this known historical event.
Conclusion
The study by Huang et al. is a valuable piece of genetic research. However, its evolutionary interpretation demonstrates a profound philosophical bias that labels even breakage and decay as “evolution.” The paper provides no evidence for the origin of new specified information or function. Instead, it offers a stark, quantifiable example of genetic degradation in a critical biological system. This finding is a direct contradiction to the creative process required by molecules-to-man evolution. When the evidence is stripped of its evolutionary narrative and analyzed rigorously, it powerfully supports a model of recent creation, common design by a master engineer, and a subsequent universal decay. The human-specific BRCA2 variant is not a stepping stone on the path of evolutionary progress, but a clear signature of a fallen, decaying genome.
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