The impact of intrauterine growth restriction and prematurity on nephron endowment.
Level 5 - mechanism / opinion, no new human data
Narrative review of developmental biology and clinical associations without systematic search methodology
PubMed 36646887 · doi:10.1038/s41581-022-00668-8
What was done
The authors synthesized literature examining the timeline of human nephrogenesis and the developmental consequences of intrauterine growth restriction (IUGR) and preterm birth on nephron count and subsequent renal health.
What was found
The abstract reports no numerical data. It states that nephrogenesis in humans is completed at approximately 36 weeks of gestation, after which nephron count does not increase. Exposure to a suboptimal intrauterine environment resulting in IUGR or preterm birth impairs kidney development, lowers nephron endowment, and associates with an elevated risk of chronic kidney disease in later life.
Why it matters
Because human nephrogenesis ceases around 36 weeks of gestation, prenatal and preterm exposures permanently fix maximal nephron endowment, establishing early-life development as a primary determinant of lifelong renal disease risk.
Limits
The abstract describes a narrative review without systematic search criteria, meta-analytic pooling, or sample sizes. Quantitative effect estimates, patient demographics, and the specific magnitudes of chronic kidney disease risk are not provided.
Cited by
- supports Humans are born with roughly one million nephrons per kidney and destroyed nephrons cannot regenerate.