Gut Wisdom: Proteins on Patrol

Scientists find a protein in the
human gut that actively fights
even antibiotic-resistant bacteria

 

Intelectin-2 Points to a Great Intellect

by Dr. Sarah Buckland-Reynolds

There is a common saying for us to ”trust our gut”. While this phrase is used casually with reference to internal instincts, science now shows the gut really does have its own built-in wisdom. Our gut has systems that defend us before we even know we are under attack. One such system recently discovered by science is a little-known gut protein called intelectin-2 (ItIn2).

Intelectin-2 is a broad-spectrum antimicrobial lectin (Dugan et al., Nature Communications, 13 January 2026). In this intriguing article published in, Amanda Dugan and 23 colleagues at MIT discovered the dual role of intelectin-2. This protein is found in the mucus lining of the gastrointestinal tract of mammals, with double functions of trapping and disabling harmful bacteria to protect our biological systems.

The research team from the Massachusetts Institute of Technology commented on these findings in their MIT press release, calling the discoveries ‘remarkable’. Is it reasonable to believe that such a remarkable dual-function, precision-guided system arose through blind Darwinian processes? Or does the foresight embedded in intelectin-2 point us toward intelligent design?

Intelectin-2: A Protein Too Sophisticated for Chance

Intelectins are a family of carbohydrate-binding proteins, or lectins, found at mucosal surfaces in mammals. They are part of the body’s frontline defense, recognizing specific sugar molecules on both host tissues and microbes. Unlike other lectins that are often single-function of either binding or signaling, Intelectin-2 combines barrier reinforcement with direct antimicrobial activity.

Dugan et al. (2026) highlight the following two critical roles of intelectin-2 in detail:

1. Defensive Role (Barrier Fortification): Intelectin-2 cross-links mucins, strengthening the mucus barrier against microbial invasion. In the author’s words:

“Both lectins recognize microbes within native microbial communities… This ability to engage mammalian and microbial glycans arises from calcium-coordinated binding of carbohydrate residues within mucus and microbial surfaces” (Dugan et al., 2026).

2. Offensive Role (Microbial Killing): Dugan et al (2026) describes the selective targeting carried out by Intelectin-2 to ensure that pathogens are neutralized without harming host tissues. In their words:

“Microbes, but not human cells, bound by mItln2 or hItln2, suffer a loss of viability” (Dugan et al., 2026).

Amidst describing such amazing proteins, the authors revert to an evolutionary explanation of their origins. In their words they state:

“We posit that intelectins, which are highly conserved across chordates, represent an evolutionarily ancient solution to host defense that predates the adaptive immune system.”

Ironically, in the same breath, immediately after appealing to evolutionary theory, they go on to add information about the unique nature of intelectins, stating that:

“In contrast to canonical antimicrobial proteins that directly disrupt bacterial membranes through electrostatic interactions, intelectins function through more specific targeting of distinct carbohydrate epitopes.”

The Evolutionary Story of Lectins and Why it Falls Short

Evolutionary biology explains lectins as ancient carbohydrate-binding proteins that diversified through gene duplication and domain shuffling, gradually acquiring specialized roles in immunity, cell signaling, and host–pathogen interactions. In this view, lectins are not designed but are the product of incremental changes that natural selection preserved when they conferred survival advantages.

As with the evolutionary story of other structures, Darwinian explanations rely on gradual, stepwise changes that confer survival advantages. However, the intelectin-2 system poses insurmountable challenges for such a mechanism, including the following key points:

1. Stepwise Evolution Problem:

Potential steps in the evolutionary processes would include the following:

1. Step 1: A random mutation produces a protein that binds galactose.
2. Step 2: Another mutation enables cross-linking of mucins.
3. Step 3: Yet another mutation allows selective binding to microbial glycans.
4. Step 4: Finally, a mutation confers microbicidal activity.

Each step must be functional and confer survival advantage. But partial functions (e.g., binding without killing, or killing without specificity) would either be neutral or harmful. Natural selection cannot preserve non-functional intermediates.

2. Specificity Challenge: This second challenge to evolution posed by Intelectin-2 is its specificity in binding. Intelectin-2 binds β-D-galactopyranose residues, which involves a highly specific recognition system. As the article notes: “MItln2 selectively binds the pyranose form of galactose (β-Galp) but not the furanose form (β-Galf) recognized by Itln1” (Dugan et al., 2026). The binding site of mItln2 differs from Itln1 by a single amino acid substitution (W288A), yet this change completely alters ligand preference.The probability of stumbling upon such fine-tuned precision by chance is difficult to justify, especially when the protein must simultaneously avoid binding host cells while targeting pathogens. This is even more so, as random mutations cannot “anticipate” which sugar residues will be most effective for microbial recognition. It is more reasonable to infer that such precision indicates foresight.
3. Integration of Functions: The fact that Intelectin-2 performs integrated functions poses a third challenge to evolution. For it to function, Intelectin-2 must simultaneously:
   1. Recognize host mucins.
   2. Cross-link them to reinforce barriers.
   3. Recognize microbial glycans.
   4. Kill microbes without harming host cells.

How reasonable is it to posit that such integration and coordinated design is merely a product of chance?

Intelectin-2: Evidence of Engineering Principles

In contrast to the flaws of evolution, several features of intelectin-2 mirror engineering principles, including but not limited to:

• Redundancy and Backup Systems: If the mucus barrier fails, intelectin-2 provides a second line of defense by directly killing microbes. Engineers often design systems with fail-safes, similar to what we observe with Intelectin-2.
• Selective Targeting: Intelectin-2 kills microbes but spares human cells. This is akin to precision-guided technology, where specificity prevents collateral damage.
• Conditional Activation: In mice, intelectin-2 is induced by Th2 cytokines (IL-4 and IL-13) during inflammation. As the study notes: “Following IL-4 and IL-13 treatment, the relative abundance of Itln2 increased to 30% of total transcript reads, indicating a 40-fold upregulation” (Dugan et al., 2026). This conditional expression ensures that resources are deployed only when needed. Such conditionalities for activation is another hallmark of efficient design.

Reflecting on the multiple functionalities discovered in Intelectin, one of the researchers, Laura Kiessling remarked:

“Harnessing human lectins as tools to combat antimicrobial resistance opens up a fundamentally new strategy that draws on our own innate immune defenses” (ScienceDaily, 16 March 2026).

Despite attributing these functionalities to evolution, this statement inadvertently acknowledges design: the body already possesses sophisticated tools that scientists now seek to imitate.

Trust your Gut: You are Fearfully and Wonderfully Made!

Note: In light of Scripture, it is important to remember that pathogenic bacteria were not part of God’s original creation. Genesis tells us that all He made was “very good” (Genesis 1:31), which implies harmony rather than hostility within the created order. The destructive microbes we battle today are a post-Fall reality, emerging as part of the corruption that entered the world through sin. Intelectin-2 can therefore be interpreted as evidence of foresight in creation, where its defensive role only became necessary once corruption entered the world.

The discovery of intelectin-2 reveals yet another remarkable example of systems that exist to protect our biological systems without conscious activation being necessary. Intelectin-2’s double-layered defense system is both elegant and indispensable, which poses significant challenges to Darwinian gradualism.

The elegance of intelectin-2 resonates with the biblical affirmation that creation is purposeful and intelligently ordered. The Psalmist declares:

“For You formed my inward parts; You knitted me together in my mother’s womb. I praise You, for I am fearfully and wonderfully made. Wonderful are Your works; my soul knows it very well” (Psalm 139:13–14).

Just as engineers marvel at systems designed with foresight, so too we marvel at the Creator’s wisdom embedded in our biology. As science uncovers more of these intricate systems, we are reminded that life is not a product of randomness but of purposeful creation. As its name rightfully bears witness, Intelectin-2 is yet another testimony to the Great Intellect of our Creator God!

---

Dr. Sarah Buckland-Reynolds is a Christian, Jamaican, Environmental Science researcher, and journal associate editor. She holds the degree of Doctor of Philosophy in Geography from the University of the West Indies (UWI), Mona with high commendation, and a postgraduate specialization in Geomatics at the Universidad del Valle, Cali, Colombia. The quality of her research activity in Environmental Science has been recognized by various awards including the 2024 Editor’s Award from the American Meteorological Society for her reviewing service in the Weather, Climate and Society Journal, the 2023 L’Oreal/UNESCO Women in Science Caribbean Award, the 2023 ICETEX International Experts Exchange Award for study in Colombia. and with her PhD research in drought management also being shortlisted in the top 10 globally for the 2023 Allianz Climate Risk Award by Munich Re Insurance, Germany. Motivated by her faith in God and zeal to positively influence society, Dr. Buckland-Reynolds is also the founder and Principal Director of Chosen to G.L.O.W. Ministries, a Jamaican charitable organization which seeks to amplify the Christian voice in the public sphere and equip more youths to know how to defend their faith.