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Digestive system and related health
Research Guide
What is Digestive system and related health?
Digestive system and related health refers to the genetic adaptations enabling lactase persistence in humans, involving CDX2 expression, intestinal differentiation, and their connections to milk consumption, lactose intolerance, evolutionary genetics, and conditions including colon cancer, gastric metaplasia, and bone health.
This field encompasses 69,196 papers on genetic mechanisms underlying lactase persistence and intestinal function. Research examines stem cells, microbiota modulation, and epithelial transitions in the colon and small intestine. Growth rate over the past 5 years is not available from the data.
Topic Hierarchy
Research Sub-Topics
Lactase Persistence Genetics
This sub-topic studies the molecular basis of lactase persistence, including LCT gene polymorphisms and regulatory variants like -13910C>T. Researchers investigate cis-regulatory elements and epigenetic controls.
Lactose Intolerance Mechanisms
Focuses on physiological and molecular pathways of lactose maldigestion, lactase non-persistence, and gut microbiota interactions. Studies cover hydrogen breath tests and symptom correlations.
CDX2 Regulation in Intestinal Differentiation
Examines CDX2 transcription factor's role in enterocyte maturation, lactase expression, and intestinal homeostasis. Researchers use organoids and knockout models to study differentiation pathways.
Evolutionary Genetics of Milk Digestion
Investigates selection pressures on lactase persistence alleles across populations, using ancient DNA and demographic modeling. Studies link pastoralism to genetic adaptations.
Lactose Intolerance and Colon Cancer Risk
Explores epidemiological links between lactase status, dairy intake, and colorectal neoplasia risk, including microbiota-mediated mechanisms. Meta-analyses assess protective or harmful effects.
Why It Matters
Studies in this field link gut microbiota modulation to prebiotic effects on colonic health, as Gibson and Roberfroid (1995) introduced prebiotics that selectively stimulate beneficial bacteria, influencing dietary interventions for digestive disorders. Barker et al. (2007) identified Lgr5 as a marker for stem cells in the small intestine and colon, enabling targeted research into intestinal regeneration and cancer initiation, with applications in understanding hereditary colorectal cancer as detailed by Kinzler and Vogelstein (1996). Parada Venegas et al. (2019) demonstrated that short chain fatty acids from gut bacteria regulate epithelial and immune responses, relevant to treating inflammatory bowel diseases like ulcerative colitis and Crohn's disease, where dysbiosis plays a causal role.
Reading Guide
Where to Start
"Dietary Modulation of the Human Colonic Microbiota: Introducing the Concept of Prebiotics" by Gibson and Roberfroid (1995), as it provides a foundational concept linking diet, microbiota, and digestive health that underpins later genetic and stem cell studies.
Key Papers Explained
Gibson and Roberfroid (1995) established prebiotics' role in microbiota modulation, which Mani et al. (2008) extended to epithelial-mesenchymal transitions generating stem-like cells, building toward Barker et al. (2007)'s identification of Lgr5 stem cells in intestine and colon. Kinzler and Vogelstein (1996) connected these to hereditary colorectal cancer pathways, while Sato et al. (2011) advanced modeling with colon organoids, linking back to Ricci-Vitiani et al. (2006)'s colon-cancer-initiating cells.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current research focuses on short chain fatty acids' regulation of gut immunity in inflammatory bowel diseases, as in Parada Venegas et al. (2019), and organoid expansions for modeling adenocarcinoma, per Sato et al. (2011). No recent preprints or news are available, indicating steady progress in stem cell and microbiota genetics.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | The Epithelial-Mesenchymal Transition Generates Cells with Pro... | 2008 | Cell | 8.6K | ✓ |
| 2 | Dietary Modulation of the Human Colonic Microbiota: Introducin... | 1995 | Journal of Nutrition | 7.6K | ✕ |
| 3 | Identification of stem cells in small intestine and colon by m... | 2007 | Nature | 5.6K | ✕ |
| 4 | Lessons from Hereditary Colorectal Cancer | 1996 | Cell | 4.9K | ✓ |
| 5 | Induction of Intestinal Th17 Cells by Segmented Filamentous Ba... | 2009 | Cell | 4.4K | ✓ |
| 6 | The Metabolic Basis of Inherited Disease | 1990 | Annals of Internal Med... | 4.0K | ✕ |
| 7 | Identification and expansion of human colon-cancer-initiating ... | 2006 | Nature | 4.0K | ✕ |
| 8 | Mutation of the mouse klotho gene leads to a syndrome resembli... | 1997 | Nature | 3.8K | ✕ |
| 9 | Long-term Expansion of Epithelial Organoids From Human Colon, ... | 2011 | Gastroenterology | 3.6K | ✓ |
| 10 | Short Chain Fatty Acids (SCFAs)-Mediated Gut Epithelial and Im... | 2019 | Frontiers in Immunology | 3.4K | ✓ |
Frequently Asked Questions
What role does Lgr5 play in intestinal stem cells?
Barker et al. (2007) identified Lgr5 as a marker gene for stem cells in the small intestine and colon. These Lgr5-positive cells drive intestinal regeneration and self-renewal. This discovery supports studies on tissue homeostasis and cancer stem cells.
How do prebiotics modulate the colonic microbiota?
Gibson and Roberfroid (1995) defined prebiotics as non-digestible food ingredients that beneficially affect the host by selectively stimulating growth of specific colonic bacteria. They promote health through microbiota modulation. This concept guides dietary strategies for gut health.
What is the significance of epithelial-mesenchymal transition in the gut?
Mani et al. (2008) showed that epithelial-mesenchymal transition generates cells with stem cell properties in intestinal contexts. These cells contribute to tissue remodeling and cancer progression. The findings apply to colon cancer stem cell research.
How do short chain fatty acids affect gut immunity?
Parada Venegas et al. (2019) explained that short chain fatty acids mediate gut epithelial and immune regulation via microbial metabolism. They are relevant for inflammatory bowel diseases through anti-inflammatory effects. Dysbiosis disrupts this regulation in ulcerative colitis and Crohn's disease.
What are key lessons from hereditary colorectal cancer?
Kinzler and Vogelstein (1996) outlined genetic pathways in hereditary colorectal cancer, identifying mutations driving tumorigenesis. These lessons inform screening and prevention strategies. The work highlights multistep progression in colon cancer.
What enables long-term expansion of colon organoids?
Sato et al. (2011) developed methods for long-term expansion of epithelial organoids from human colon, adenoma, adenocarcinoma, and Barrett's epithelium. These organoids model intestinal differentiation and disease. They support research on genetic adaptations and health conditions.
Open Research Questions
- ? How does CDX2 expression specifically regulate lactase persistence across human populations?
- ? What genetic interactions link intestinal stem cell markers like Lgr5 to colon cancer initiation?
- ? How do microbiota-derived short chain fatty acids influence Th17 cell induction in the gut?
- ? What evolutionary pressures drove lactase persistence adaptations and their ties to bone health?
- ? How do organoid models reveal mechanisms of gastric metaplasia in lactose intolerance contexts?
Recent Trends
The field maintains 69,196 works with no specified 5-year growth rate.
Parada Venegas et al. represents recent emphasis on short chain fatty acids in gut regulation and inflammatory bowel diseases.
2019No new preprints or news coverage in the last 12 months or 6 months is available.
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