Gene Editing on Human Embryos Raises Urgent Questions About Who Counts as a Person

Gene Editing on Human Embryos Raises Urgent Questions About Who Counts as a Person

Science has a long and productive tradition of pushing boundaries in service of human flourishing. The question that bioethicists now place before the public is not whether gene editing holds promise, but whether the methods used to refine that technology have respected the boundaries that define what it means to be human in the first place.

Researchers at Columbia University, led by Dieter Egli, a professor of developmental cell biology in the Department of Pediatrics, have used a technique called base editing to replace individual genetic letters within sequences of human embryonic DNA. According to a June 2025 report in the New York Times, the precision achieved was described as "unprecedented accuracy" in the field. Unlike CRISPR, the more widely known gene editing method notorious for off-target damage to DNA sequences, Egli's base editing approach appears to minimize collateral genetic disruption. Potential side effects remain unknown, and the technique is not yet ready for clinical implementation.

On the surface, this reads as a straightforward scientific advancement. Beneath it lies a set of ethical fractures that deserve serious, sustained attention.

What the Science Actually Did

The Columbia research involved editing DNA within human embryos, beings at the earliest stage of development. Father Tadeusz Pacholczyk, a neuroscientist and senior ethicist at the National Catholic Bioethics Center, responded directly and without ambiguity: the experiments should have been conducted on animal embryos rather than human ones.

"Trying to make genetic modifications in a more efficient manner than had been previously achieved is precisely the kind of experiment that should have been carried out in animal embryos, not human embryos," Pacholczyk told EWTN News. "The same basic biological information reported in these studies could readily have been obtained that way."

This is not a fringe theological objection. It is a point grounded in scientific methodology itself. If equivalent data is obtainable through animal models, then the decision to use human embryos is not a scientific necessity but an ethical choice, and one made with serious consequences for how the field understands its own subjects of study.

The embryos used in the Columbia research were obtained through two pathways. Some came from parents at fertility clinics, individuals who had embryos remaining after IVF procedures. Others were created specifically for research purposes, meaning eggs were obtained from women, fertilized in laboratory conditions, and brought into existence solely to serve as experimental material. In several cases, the human embryos were intentionally destroyed after the base editing work was completed, in order to harvest their embryonic stem cells for additional research.

Pacholczyk described these embryos, without rhetorical softening, as "extremely young leftover children" who were handed over to scientists, and as "embryonic humans in glassware" created to serve as "raw materials for research and experimentation."

The Personhood Problem at the Core

The language used in both the scientific reporting and Pacholczyk's critique reveals something important about the underlying disagreement. When the New York Times describes an embryo as material for study and Pacholczyk describes that same entity as a child, neither is simply choosing stylistic preference. Each is making a claim about ontology, about what kind of being is present at fertilization.

This is precisely the terrain where Catholic anthropology and contemporary bioethics intersect in ways that matter enormously for mental health, wellness, and human flourishing at scale. The Catholic Christian understanding of the person holds that human life possesses inherent dignity from the moment of conception, not because of developmental milestones, cognitive function, or social recognition, but because of what the being is. That metaphysical claim has measurable consequences for how healthcare systems, research institutions, and therapeutic frameworks treat vulnerable populations.

The history of medicine contains sobering examples of what happens when the definition of personhood is made contingent on utility or developmental stage. These are not abstract warnings. They are documented patterns with documented victims. The current debate over embryonic experimentation is not disconnected from those histories. It is a contemporary chapter in the same ongoing negotiation between scientific ambition and ethical constraint.

Eugenics at the Door

The developing base editing technology carries a second layer of ethical complexity that moves beyond the question of embryo research into the territory of human design. Gene editing at the embryonic stage could, in principle, be used to eliminate disease-causing mutations before they express themselves in a living person. The therapeutic potential in this application is real and should not be dismissed.

But the same technology, applied with different intentions, could be used to select or eliminate traits in unborn children based on parental or social preference. The line between therapeutic intervention and eugenic selection is not always as clear in practice as it appears in theory, and the institutional pressures that shape research funding, fertility clinic offerings, and insurance coverage have historically not been reliable guardians of that line.

Father Pacholczyk's concern, shared by many Catholic bioethicists and a significant number of secular bioethicists as well, is that the research being conducted now is building the technical infrastructure for applications that have not yet been ethically adjudicated. Base editing with unprecedented accuracy is a tool. What matters is who controls it, under what regulatory framework, and with what understanding of the human person as its subject.

Resilience Requires a Foundation

For those working in Catholic mental health, positive psychology, and faith-based wellness, the conversation around gene editing is not a distant abstraction. It connects directly to the questions that practitioners encounter in therapeutic work every day: What is the source of human dignity? What makes a life worth protecting? How do communities form and sustain the kinds of bonds that make healing possible?

The therapeutic alliance, that irreplaceable relationship between clinician and client, is built on a foundational assumption that the person across the table possesses inherent worth. That assumption is not self-evident in every framework. It requires a coherent account of what a person is. Catholic anthropology provides one of the most developed and resilient accounts available, one that has been refined across centuries of philosophical, theological, and clinical engagement.

When that anthropology is brought to bear on questions like embryonic experimentation, it does not simply generate prohibitions. It generates a positive vision of the human person as irreducibly valuable, as oriented toward relationship, truth, and transcendence, and as deserving of protection at every stage of development. That vision is the same one that animates the best work in trauma-informed care, resilience research, and integrative mental health.

The Columbia University research and the response it has generated from figures like Father Pacholczyk represent a significant moment in a long-running cultural negotiation. The technology is advancing. The ethical frameworks are lagging. The gap between those two trajectories is where some of the most consequential decisions about human life will be made in the coming decades.

Precision in Science Demands Precision in Ethics

There is a certain irony in the language used to describe Egli's base editing technique. The word "precision" appears repeatedly in coverage of this research, and it is meant as praise. Precision matters in gene editing because imprecision causes damage. Off-target edits, the kind CRISPR is known for, disrupt sequences that were not intended for modification. Precision, by contrast, affects only the intended target.

The same standard applies to ethical reasoning. Imprecise thinking about personhood, about the moral status of embryos, about the difference between therapy and selection, causes damage that spreads beyond the immediate experiment. Precise ethical reasoning, grounded in a coherent and well-developed account of the human person, is not the enemy of scientific progress. It is the condition under which scientific progress remains genuinely oriented toward human good.

Pacholczyk's critique is, in this sense, a call for precision. The experiments at Columbia were not imprecise in their technical execution. They were imprecise in their ethical framing, reaching for human subjects when animal models were available, creating life for the purpose of ending it, and treating developmental stage as the relevant criterion for whether an entity deserves protection.

A Forward-Looking Frame

The conversation about gene editing, embryonic research, and personhood will not resolve itself through any single bioethical statement or scientific publication. It will unfold across institutions, regulatory bodies, fertility clinics, university ethics boards, and the lived decisions of families navigating reproductive medicine.

What Catholic mental health and faith-based wellness communities bring to this conversation is not primarily a set of prohibitions but a coherent and humanizing vision of the person. That vision holds that every human being, regardless of developmental stage, cognitive capacity, or social utility, carries a dignity that precedes and exceeds whatever science can measure or modify.

The precision being celebrated in Columbia's base editing research is genuinely impressive. The question that bioethicists like Pacholczyk are pressing, and that practitioners in Catholic mental health and positive psychology must continue to engage, is whether the science will eventually develop an equal precision in its account of the being it is editing.

This article draws on reporting by EWTN News and the New York Times, as well as public statements from Father Tadeusz Pacholczyk of the National Catholic Bioethics Center.