Which of these is thought to be a mechanism to explain the DOHaD (developmental origins of health and disease) theory?

Question

BlackTom AI · Accepted Answer

Developmental plasticity and epigenetic remodeling are central to DOHaD: early environmental exposures alter how tissues form and how many/which cell types are produced, changing lifelong physiology.

1. Relevant knowledge points and concepts
- DOHaD (Developmental Origins of Health and Disease) posits that exposures during prenatal and early postnatal development program long-term health by altering organ structure, cell numbers/types, and gene expression.  
- Mechanisms include altered cell proliferation and differentiation, changes in organogenesis (e.g., fewer nephrons), and epigenetic modifications (DNA methylation, histone changes, noncoding RNAs) that change gene expression without altering DNA sequence.

2. Step-by-step reasoning
- DOHaD requires a biological mechanism linking early environment to later disease risk.  
- Environmental insults (undernutrition, hypoxia, stress, toxins) during critical windows can change developmental signaling, shifting cell fate decisions and rates of cell division/apoptosis.  
- Those changes produce altered tissue composition (e.g., fewer pancreatic beta cells, reduced nephron number, altered vascular smooth muscle) that predispose to metabolic disease or hypertension.

3. Calculations/intermediate steps
- Not applicable (conceptual reasoning rather than numerical calculation).

4. Why the correct answer is correct
- Option b states that changes to numbers or types of cells occur during development after environmental stimuli. This directly describes altered organogenesis and cellular allocation—the core biological mechanism invoked by DOHaD and supported by experimental and epidemiological evidence.

5. Why other options are incorrect
- a. Implies changes to the DNA base sequence (mutations); DOHaD does not rely on new mutations but on altered expression/regulation.  
- c. States a population-level correlation (obesity rates caused by low birth weight) rather than a mechanistic developmental explanation. Correlation ≠ mechanism.  
- d. “Changes to genotype” is equivalent to sequence changes; DOHaD involves phenotype and epigenotype changes, not genotype alteration.

6. Conclusion
The correct choice is b. Changes in cell numbers/types during development after environmental stimuli explain DOHaD, confirming the provided answer (b).

Which of these is thought to be a mechanism to explain the DOHaD (developmental origins of health and disease) theory?单项选择题

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