The ANK2 gene mutations are marked risk factors for autism spectrum disorder, one of the neurodevelopmental disorders (NDDs) that often extends into adulthood and has a complex etiology involving genetic and environmental factors. ANK2 encodes 2 major isoforms, AnkB-220 (220-kDa isoform of ankyrin-B) and giant AnkB-440. We previously generated a targeted knockout (KO) of giant AnkB-440 in 2 cynomolgus and 2 rhesus monkeys. While no autism-spectrum-disorder-like phenotypes were observed during infancy, we found marked brain volume loss. In this study, we conducted a longitudinal multimodal study in these giant ANK2 KO monkeys during adolescent and young adulthood. Behavioral results from these giant ANK2 KO monkeys revealed increased locomotor activity, deficient cognition (including working memory, cognitive flexibility, and operant lever-press learning), and impaired emotional regulation and social interaction. Furthermore, the giant ANK2 KO monkeys exhibited persistent structural and functional brain abnormalities, up-regulation of brain triglyceride and glycerophospholipids, and peripheral blood transcriptome signatures of immune dysregulation, which may be related to their behavioral alternations. These observations suggest that giant ANK2 depletion in non-human primates phenocopies aspects of behavioral, neural, and molecular features characteristic of NDDs. This study provides an in-depth exploratory longitudinal characterization of giant ANK2 functions in primate brains, which may contribute to translational research on NDDs.
Jian-Hong Wang, Hong-Di Huang, Yun-Chao Ji et al.· Research· 1 citation
Background Spermatogenesis is a highly intricate and tightly regulated process that involves the coordinated interplay of various cell types. Understanding the expression profiles of individual cells is crucial for unraveling the intricacies of spermatogenesis. This study aimed to uncover novel gene expression patterns and regulatory features during primate spermatogenesis. Methods We performed single-nucleus RNA sequencing on testicular tissues from cynomolgus macaques at four developmental stages (infancy, puberty, adulthood, and aged). To explore chromatin regulatory landscapes, we also conducted single-nucleus ATAC sequencing on pubertal testes. We integrated both datasets and applied clustering, differential expression analysis, gene ontology enrichment, pseudo time trajectory reconstruction, and transcription factor motif enrichment to characterize cell types, differentiation trajectories, and cell-type-specific regulatory programs. Results Our integrated analysis comprehensively characterized all major germ and somatic cell types, including a previously unrecognized quiescent undifferentiated spermatogonial (uSPG) subtype in early spermatogenesis that exhibits a transcriptomic state distinct from canonical type A spermatogonial stem cells, which we provisionally term as uSPG1. We also revealed the differentiation states, and expression and function of genes within distinct cell types during spermatogenesis. Notably, we found that classic niche factors essential for spermatogonial stem cell maintenance, including GDNF, FGF2, and CXCL12, were not readily detected in Sertoli cells by snRNA-seq. Instead, their transcripts were predominantly observed in myoid cells or germ cells, a pattern corroborated by both transcriptomic and chromatin accessibility data. This observation, pending further experimental validation, suggests a need for reevaluation of the cellular sources of these critical niche signals in primates. Conclusion These findings offer a refined single-nucleus-resolution view of primate spermatogenesis, revealing a novel undifferentiated germ cell state and emphasizing the need for further exploration of Sertoli cells in male reproductive biology. Our results underscore the power of combined single-nucleus RNA and ATAC sequencing for investigating complex reproductive tissues. This research enhances our understanding of the intricate mechanisms governing spermatogenesis and may offer new perspectives on male fertility regulation.
Yu Zhang, Shu Wei, Run-Qing Zou et al.· Frontiers in Cell and Develo...· 0 citations
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