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Cross-species analysis of adult hippocampal neurogenesis reveals human-specific gene expression but convergent biological processes

Abstract

Immature dentate granule cells (imGCs) arising from adult hippocampal neurogenesis contribute to plasticity, learning and memory, but their evolutionary changes across species and specialized features in humans remain poorly understood. Here we performed machine-learning-augmented analysis of published single-nucleus RNA-sequencing datasets and identified macaque imGCs with transcriptome-wide immature neuronal characteristics. Our cross-species comparisons among humans, monkeys, pigs and mice showed few shared (such as DPYSL5), but mostly species-specific gene expression in imGCs that converged onto common biological processes regulating neuronal development. We further identified human-specific transcriptomic features of imGCs and demonstrated the functional roles of human imGC-enriched expression of a family of proton-transporting vacuolar-type ATPase subtypes in the development of imGCs derived from human pluripotent stem cells. Our study reveals divergent gene expression patterns but convergent biological processes in the molecular characteristics of imGCs across species, highlighting the importance of conducting independent molecular and functional analyses for adult neurogenesis in different species.

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Fig. 1: Machine-learning-augmented identification and molecular characteristics of immature neurons in macaque hippocampal scRNA-seq datasets.
Fig. 2: Identification of immature neurons in the postnatal macaque hippocampus across ages and studies.
Fig. 3: Conserved immature neuronal biological processes with divergent gene expression feature in imGCs of different species.
Fig. 4: Species-specific enrichment of imGC molecular features.
Fig. 5: Human-enriched hippocampal immature neuron features and functional roles of a family of genes encoding v-ATPases.

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Data availability

All scRNA-seq or single-nucleus RNA-seq data were previously published (summarized in Supplementary Table 1). Additional information required for reanalyzing the data presented in this study can be obtained from the corresponding authors upon request. Source data are provided with this paper.

Code availability

Scripts for bioinformatic analyses used in this study are available at https://github.com/zhoujoeyyi/imGC_species/.

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Acknowledgements

We thank members of the Song, Ming and Zhou laboratories, and S. Zhu (CAS Inst. of Neurosci./CEBSIT) for discussion; K. M. Christian (U Penn) for comments; Z. Xu (CAS Inst. of Genet. & Dev. Biol.), X. Teng (ACD, Bio-Techne), L. Gu (from S.X. lab), C. Chen (from S.X. lab) and L. Xie (from Y. Chen lab at CAS Inst. of Neurosci./CEBSIT) for help on in situ hybridization experiments; B. Temsamrit (U Penn), E. LaNoce (U Penn), A. Garcia-Epelboim (U Penn), G. Alepa (U Penn), A. Angelucci (U Penn) and Y. Lu (CAS Inst. of Neurosci./CEBSIT) for laboratory support; and W. Luo, Q. Wu and Y. Chen from U Penn for providing reagents. Some schematic illustrations were created using images modified from BioRender.com. This work was supported by grants from the National Institutes of Health (R35NS137480 to G.-l.M., R35NS116843 and RF1AG079557 to H.S. and R01NS127913 to Y.S.), the Lieber Institute for Brain Development (to J.E.K., T.M.H. and D.R.W.), Dr. Miriam and Sheldon G. Adelson Medical Research Foundation (to G.-l.M.), the National Key Research and Development Program of China (2024YFA1803400 to Y. Zhou), Shanghai Science and Technology Development Funds (24QA2710400 to Y. Zhou), Shanghai Pujiang Program (23PJ1414500 to Y. Zhou), Science and Technology Commission of Shanghai Municipality (22JC1403100 to S.X.) and the National Science Foundation of China (32321003 and 32371072 to S.X.).

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Authors

Contributions

Y. Zhou led the project and contributed to all aspects. Y.S., T.G., X.M. and L.W. contributed to computational data analyses. Q.Y. and Y.H. developed the in vitro human hippocampal neuron culture system and Q.Y. contributed to in vitro culture experiments. J.L., Y. Zhong, M.J., X.L., L.Y., C. Li, S.X. and J.H. contributed to histology analysis. B.C.K., A.N.V., I.H., S.K.K., J.E.K., T.M.H., D.W.N. and D.R.W. provided human hippocampal specimens. C. Liu provided marmoset specimens. Y. Zhong, N.Y., Z.L., Z.S. and C. Li provided macaque specimens. Y. Zhou, Y.S., G.-l.M. and H.S. conceived the project and wrote the manuscript with inputs from all authors.

Corresponding authors

Correspondence to Yi Zhou, Guo-li Ming or Hongjun Song.

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Extended data

Extended Data Fig. 1 Identification and molecular characteristics of immature neurons in a published macaque hippocampal single-cell RNA sequencing dataset using traditional unsupervised clustering.

a, Gene module analysis of the previously annotated immature dentate granule cells (imGCs) and mature dentate granule cells (mGCs) in an adult macaque hippocampus single-nucleus RNA sequencing dataset20 using a well-recognized published list of mouse immature progeny (neuroblast and imGC)-enriched and mGC-enriched genes11. Box plots as in Fig. 3a. b, Top Gene Ontology (GO) term groups for genes enriched in imGCs (using published annotations with traditional unsupervised clustering20). Schematics created using BioRender.com. Reg., regulation.

Source data

Extended Data Fig. 2 Performance of machine learning model for macaque imGCs and feature extraction and comparison of gene weights defining imGCs in different species.

a, Measuring performance of our machine learning model for macaque datasets. Line plot showing the accuracy score of the machine learning classifier varying with decreasing regularization strength as estimated by cross-validation. The red line shows a 95% confidence interval on the estimation of the accuracy score. #Sum abs (coeffs): sum of the absolute value of regression coefficients. b, Heatmap showing expression of top gene weights in top-scoring cells of each prototype determined by our machine learning model for macaque datasets. The genes listed are the top 25 weights defining macaque imGCs. c, Venn diagram of the positive gene weights defining imGCs in humans, macaques, and mice that were generated by separate machine learning models (weights for human and mouse imGCs were generated in ref. 25). Schematics in c created using BioRender.com. Astro: astrocyte; OPC: oligodendrocyte progenitor cell; mOli: mature oligodendrocyte.

Extended Data Fig. 3 Specificity of our machine learning approach for identification of immature neurons in the macaque brain.

a, The fractions of cells with high similarity scores (pimGC ≥ 0.85) among excitatory dentate granule cell (GC), non-GC excitatory neuron, GABAergic interneuron, and non-neuronal cell clusters in various single-cell or single-nucleus RNA sequencing (scRNA-seq) datasets of the macaque hippocampus. Each dot represents data from one specimen from each study (noted by first author’s last name). Note that all imGCs identified reside in the GC clusters. b, No immature neurons were identified using our machine learning model in a scRNA-seq dataset of two 6-year macaque neocortex (one male and one female)42.

Source data

Extended Data Fig. 4 Shared molecular signatures of immature neurons in the hippocampus of different species.

a, GO network of biological processes associated with imGC-enriched genes in different species in comparison to mGCs, colored by FDR-adjusted P value. Only significantly enriched nodes are displayed (one-sided hypergeometric test, FDR-adjusted P < 0.05). The node size represents the term enrichment significance. Examples of the most substantial terms per group are shown. b, Violin plots showing normalized expression of 8 imGC-enriched genes shared across four species in imGCs and GCs (one-way Wilcoxon rank-sum test). A total of nine shared genes were identified and eight are shown here (see Fig. 3d for the plot for the ninth gene, DPYSL5). Schematics created using BioRender.com.

Extended Data Fig. 5 Enrichment of immature neuronal gene features in imGCs of different species.

a, Expression patterns of nine shared imGC-enriched genes across species in the dentate gyrus (DG) of adult mice, eight of which show enrichment in the neurogenic subgranular zone (except for PROX1). Images are from the Allen Brain in situ hybridization database46 (https://mouse.brain-map.org/). P: postnatal day. b, A second set of sample confocal immunostaining images of DPYSL5 enrichment in imGCs in the hippocampi of infant and adult humans, postnatal macaques and marmosets, and adult mice. Scale bars: 10 µm. Asterisks indicate DPYSL5+ cells among STMN1+PROX1+ imGCs (Fig. 3e). c, Venn diagram depicting the overlap of GC-enriched genes across different species when compared to other cell types within the same datasets. d, A schematic illustration of our working model. In contrast to the traditional concept that a single genetic variant can drive cross-species cellular innovations in immature neuron regulation, our study revealed substantial interspecies variance in highly expressed genes enriched in imGCs, which converged onto conserved biological processes, suggesting imGCs in different species may recruit and use species-unique molecular features to drive similar biological processes regulating neuronal development. Schematics in c and d created using BioRender.com.

Extended Data Fig. 6 A schematic of imGC-enriched feature analysis in different species.

To explore species-specific imGC molecular features in a nonbiased manner, gene expression patterns of each individual gene associated with ‘ion transport’ and ‘synaptic transmission’, the two major GO terms showing the most species-specific enrichment, were plotted (Extended Data Fig. 7). Schematics created using BioRender.com.

Extended Data Fig. 7 Unbiased examination of divergent imGC molecular features across four species.

Red-blue heatmaps depict expression patterns of each individual gene associated with ‘ion transport’ and ‘synaptic transmission’, the two major GO terms showing the most species-specific enrichment. Exemplary genes in these two categories, such as those encoding various ion channels, glutamate receptors, GABA receptors, ATPases and transmembrane proteins, among others are highlighted with square boxes. The color bar represents z scores of gene expression, scaled to range from −2 to 2. Schematics created using BioRender.com.

Extended Data Fig. 8 Role of lysosomal vacuolar-type H+-transporting ATPase in the in vitro human hippocampal immature neuron culture.

a, A schematic illustration of the experimental design. Human induced pluripotent stem cell (iPSC) lines (C65 and WTC11) were differentiated into DCX+PROX1+ hippocampal imGCs before treatment with bafilomycin A1 (BafA1) and concanamycin A (ConA), two specific blockers against lysosomal vacuolar-type H+-transporting ATPases to measure neurite growth and neuronal activities. be, Characterization of hippocampal imGC culture derived from two independent iPSC lines. Sample confocal images (b) and quantification of DCX and PROX1 enrichment in the hippocampal neuron in vitro culture (c,d) and its cell death level (e) with different treatments. Scale bar: 10 µm. Asterisks indicate cleaved Caspase 3 (cCasp3)+DCX+PROX1+ imGCs (b). Box colors match treatment conditions. Dots represent data from individual images; the centerline represents the mean, box edges show s.e.m. and whiskers extend to the maximum and minimum values (n = 3 cultures per condition) (ce). None of the quantifications were statistically significant using ANOVA posthoc test; exact P values in Supplementary Table 7 (ce).

Source data

Supplementary information

Reporting Summary

Supplementary Table 1

Summary of published scRNA-seq or single-nucleus RNA-seq datasets used in the current study.

Supplementary Table 2

Molecular weights defining immature dentate granule cells in macaques.

Supplementary Table 3

GO terms related to the positive gene weights defining macaque immature dentate granule cells.

Supplementary Table 4

Lists of GO terms associated with genes enriched in immature dentate granule cells across four species.

Supplementary Table 5

Lists of GO terms associated with genes uniquely enriched in immature dentate granule cells in four species.

Supplementary Table 6

Summary of human specimens used for histology validation.

Supplementary Table 7

Exact P values for Fig. 5 and Extended Data Fig. 8.

Source data

Source Data Fig. 1

Statistical source data for Fig. 1b.

Source Data Fig. 2

Statistical source data for Fig. 2b.

Source Data Fig. 3

Statistical source data for Fig. 3b,f.

Source Data Fig. 4

Statistical source data for Fig. 4a.

Source Data Fig. 5

Statistical source data for Fig. 5c,e,g.

Source Data Extended Data Fig. 1

Statistical source data for ED Fig. 1.

Source Data Extended Data Fig. 3

Statistical source data for ED Fig. 3a,b.

Source Data Extended Data Fig. 8

Statistical source data for ED Fig. 8c–e.

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Zhou, Y., Su, Y., Yang, Q. et al. Cross-species analysis of adult hippocampal neurogenesis reveals human-specific gene expression but convergent biological processes. Nat Neurosci 28, 1820–1829 (2025). https://doi.org/10.1038/s41593-025-02027-9

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