Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 4 complete abstracts (695 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
Mechanisms that prevent different populations from exchanging genes (gene flow), resulting in or maintaining genetic speciation. It can either prevent mating to take place or ensure that any offspring produced is either inviable or sterile, thereby preventing further reproduction.
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Isolation, Reproductive; Isolations, Reproductive; Reproductive Isolations; Hybridization Barriers; Hybridization Barrier; Barrier, Hybridization; Barriers, Hybridization.
Where it fits in the MeSH classification
- Broader topics
- Biological Evolution
Related concepts
- Gene Flow
- Genetic Speciation
- Reproduction
Research landscape
PubMed indexes 1,520 records tagged with the MeSH heading “Reproductive Isolation” (counts retrieved 2026-10-29). 554 of them (36.4%) were published from 2020 onward, and the busiest period so far is 2010-2019 with 974 records.
Reviews account for 108 records (7.1%) and meta-analyses for 5. Randomized controlled trials number 0 (0.0%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.
Show the data
| Period | Records |
|---|---|
| through 1999 | 0 |
| 2000-2009 | 0 |
| 2010-2019 | 974 |
| 2020 onward | 554 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 108 | 7.1% |
| Meta-analyses | 5 | 0.3% |
| Randomized controlled trials | 0 | 0.0% |
Method: PubMed query "Reproductive Isolation"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.
Reading the evidence in genetics and genomics
Genetic findings vary widely in strength. A variant linked to a condition in one study may not replicate in other ancestries, and most common variants have small effects that are meaningful only in aggregate. Studies of rare, high-impact variants can support strong causal claims about a gene, while association studies describe statistical links that need functional and independent replication. Check the sample size, the ancestry of participants, whether results were replicated, and whether a laboratory or clinical outcome was actually measured.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
| Study / authors | Year | Source label / design | Europe PMC citations | Licence / source |
|---|---|---|---|---|
| Speciation and introgression between Mimulus nasutus and Mimulus guttatus | 2014 | Research article Design not recorded in structured metadata | 232 | cc by PMID 24967630 · DOI · PMC4072524 |
| Paternally expressed imprinted genes establish postzygotic hybridization barriers in Arabidopsis thaliana | 2015 | Research article Design not recorded in structured metadata | 109 | cc by PMID 26344545 · DOI · PMC4589659 |
| Reproductive isolation of hybrid populations driven by genetic incompatibilities | 2015 | Research article Design not recorded in structured metadata | 100 | cc by PMID 25768654 · DOI · PMC4359097 |
| Ancient DNA reveals reproductive barrier despite shared Avar-period culture | 2025 | Research article Design not recorded in structured metadata | 24 | cc by PMID 39814885 · DOI · PMC11864967 |
Speciation and introgression between Mimulus nasutus and Mimulus guttatus [1]
Abstract reading summary — source excerpts
- Opening excerpt
- Mimulus guttatus and M.
- Closing excerpt
- guttatus.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (149 words)
Mimulus guttatus and M. nasutus are an evolutionary and ecological model sister species pair differentiated by ecology, mating system, and partial reproductive isolation. Despite extensive research on this system, the history of divergence and differentiation in this sister pair is unclear. We present and analyze a population genomic data set which shows that M. nasutus budded from a central Californian M. guttatus population within the last 200 to 500 thousand years. In this time, the M. nasutus genome has accrued genomic signatures of the transition to predominant selfing, including an elevated proportion of nonsynonymous variants, an accumulation of premature stop codons, and extended levels of linkage disequilibrium. Despite clear biological differentiation, we document genomic signatures of ongoing, bidirectional introgression. We observe a negative relationship between the recombination rate and divergence between M. nasutus and sympatric M. guttatus samples, suggesting that selection acts against M. nasutus ancestry in M. guttatus.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 24967630 · DOI · PMC4072524
Paternally expressed imprinted genes establish postzygotic hybridization barriers in Arabidopsis thaliana [2]
Abstract reading summary — source excerpts
- Opening excerpt
- Genomic imprinting is an epigenetic phenomenon causing parent-of-origin specific differential expression of maternally and paternally inherited alleles.
- Closing excerpt
- Our work reveals that a subset of PEGs maintains functional roles in the inbreeding plant Arabidopsis that become evident upon deregulated expression.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (118 words)
Genomic imprinting is an epigenetic phenomenon causing parent-of-origin specific differential expression of maternally and paternally inherited alleles. While many imprinted genes have been identified in plants, the functional roles of most of them are unknown. In this study, we systematically examine the functional requirement of paternally expressed imprinted genes (PEGs) during seed development in Arabidopsis thaliana. While none of the 15 analyzed peg mutants has qualitative or quantitative abnormalities of seed development, we identify three PEGs that establish postzygotic hybridization barriers in the endosperm, revealing that PEGs have a major role as speciation genes in plants. Our work reveals that a subset of PEGs maintains functional roles in the inbreeding plant Arabidopsis that become evident upon deregulated expression.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 26344545 · DOI · PMC4589659
Reproductive isolation of hybrid populations driven by genetic incompatibilities [3]
Abstract reading summary — source excerpts
- Opening excerpt
- Despite its role in homogenizing populations, hybridization has also been proposed as a means to generate new species.
- Closing excerpt
- Intriguingly, several known hybrid species exhibit patterns of reproductive isolation consistent with the predictions of our model.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (197 words)
Despite its role in homogenizing populations, hybridization has also been proposed as a means to generate new species. The conceptual basis for this idea is that hybridization can result in novel phenotypes through recombination between the parental genomes, allowing a hybrid population to occupy ecological niches unavailable to parental species. Here we present an alternative model of the evolution of reproductive isolation in hybrid populations that occurs as a simple consequence of selection against genetic incompatibilities. Unlike previous models of hybrid speciation, our model does not incorporate inbreeding, or assume that hybrids have an ecological or reproductive fitness advantage relative to parental populations. We show that reproductive isolation between hybrids and parental species can evolve frequently and rapidly under this model, even in the presence of substantial ongoing immigration from parental species and strong selection against hybrids. An interesting prediction of our model is that replicate hybrid populations formed from the same pair of parental species can evolve reproductive isolation from each other. This non-adaptive process can therefore generate patterns of species diversity and relatedness that resemble an adaptive radiation. Intriguingly, several known hybrid species exhibit patterns of reproductive isolation consistent with the predictions of our model.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 25768654 · DOI · PMC4359097
Ancient DNA reveals reproductive barrier despite shared Avar-period culture [4]
Abstract reading summary — source excerpts
- Opening excerpt
- After a long-distance migration, Avars with Eastern Asian ancestry arrived in Eastern Central Europe in 567 to 568 CE and encountered groups with very different European ancestry1,2.
- Closing excerpt
- Mobility between sites was mostly due to female exogamy pointing to different marriage networks as the main driver of the maintenance of the genetic barrier.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (231 words)
After a long-distance migration, Avars with Eastern Asian ancestry arrived in Eastern Central Europe in 567 to 568 CE and encountered groups with very different European ancestry1,2. We used ancient genome-wide data of 722 individuals and fine-grained interdisciplinary analysis of large seventh- to eighth-century CE neighbouring cemeteries south of Vienna (Austria) to address the centuries-long impact of this encounter1,2. We found that even 200 years after immigration, the ancestry at one site (Leobersdorf) remained dominantly East Asian-like, whereas the other site (Mödling) shows local, European-like ancestry. These two nearby sites show little biological relatedness, despite sharing a distinctive late-Avar culture3,4. We reconstructed six-generation pedigrees at both sites including up to 450 closely related individuals, allowing per-generation demographic profiling of the communities. Despite different ancestry, these pedigrees together with large networks of distant relatedness show absence of consanguinity, patrilineal pattern with female exogamy, multiple reproductive partnerships (for example, levirate) and direct correlation of biological connectivity with archaeological markers of social status. The generation-long genetic barrier was maintained by systematically choosing partners with similar ancestry from other sites in the Avar realm. Leobersdorf had more biological connections with the Avar heartlands than with Mödling, which is instead linked to another site from the Vienna Basin with European-like ancestry. Mobility between sites was mostly due to female exogamy pointing to different marriage networks as the main driver of the maintenance of the genetic barrier.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 39814885 · DOI · PMC11864967
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article The genetics of hybrid incompatibilities [5]
- Research article The origins of reproductive isolation in plants [6]
- Research article Divergence hitchhiking and the spread of genomic isolation during ecological speciation-with-gene-flow [7]
- Research article The importance of intrinsic postzygotic barriers throughout the speciation process [8]
- Research article Reinforcement in plants [9]
- Research article The Reproductive Microbiome: An Emerging Driver of Sexual Selection, Sexual Conflict, Mating Systems, and Reproductive Isolation [10]
References
- Brandvain Y, Kenney AM, Flagel L, Coop G, Sweigart AL. Speciation and introgression between Mimulus nasutus and Mimulus guttatus. . 2014. PMID 24967630 · DOI · PMC4072524
- Wolff P, Jiang H, Wang G, Santos-González J, Köhler C. Paternally expressed imprinted genes establish postzygotic hybridization barriers in Arabidopsis thaliana. . 2015. PMID 26344545 · DOI · PMC4589659
- Schumer M, Cui R, Rosenthal GG, Andolfatto P. Reproductive isolation of hybrid populations driven by genetic incompatibilities. . 2015. PMID 25768654 · DOI · PMC4359097
- Wang K, Tobias B, Pany-Kucera D, Berner M, Eggers S, Gnecchi-Ruscone GA, et al.. Ancient DNA reveals reproductive barrier despite shared Avar-period culture. . 2025. PMID 39814885 · DOI · PMC11864967
- Maheshwari S, Barbash DA. The genetics of hybrid incompatibilities. Annu Rev Genet. 2011. PMID 21910629 · DOI
- Baack E, Melo MC, Rieseberg LH, Ortiz-Barrientos D. The origins of reproductive isolation in plants. New Phytol. 2015. PMID 25944305 · DOI
- Via S. Divergence hitchhiking and the spread of genomic isolation during ecological speciation-with-gene-flow. Philos Trans R Soc Lond B Biol Sci. 2012. PMID 22201174 · DOI · PMC3233719
- Coughlan JM, Matute DR. The importance of intrinsic postzygotic barriers throughout the speciation process. Philos Trans R Soc Lond B Biol Sci. 2020. PMID 32654642 · DOI · PMC7423280
- Hopkins R. Reinforcement in plants. New Phytol. 2013. PMID 23495388 · DOI
- Rowe M, Veerus L, Trosvik P, Buckling A, Pizzari T. The Reproductive Microbiome: An Emerging Driver of Sexual Selection, Sexual Conflict, Mating Systems, and Reproductive Isolation. Trends Ecol Evol. 2020. PMID 31952837 · DOI
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-29.
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Evidence strength
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