James Noonan
· Director of Graduate Studies, Albert E. Kent Professor of Genetics and Professor of Neuroscience; co-Director of Graduate Studies, GeneticsVerifiedYale University · Medical Genetics
Active 1977–2026
About
James Noonan, PhD, is the Albert E. Kent Professor of Genetics and Professor of Neuroscience at Yale University. He received his undergraduate degree in Biology and English Literature (Honors) from Binghamton University and completed his Ph.D. in Genetics at Stanford University in 2004 under the supervision of Dr. Richard Myers. His postdoctoral work was conducted in Dr. Edward Rubin's lab at the Lawrence Berkeley National Laboratory and the U.S. Department of Energy Joint Genome Institute. Dr. Noonan joined the Yale Genetics faculty in September 2007. His laboratory has made significant contributions to understanding human-specific regulatory elements, including the discovery that Human Accelerated Regions (HARs) encode transcriptional enhancers with activity in the developing embryo. His research has pioneered the development of humanized mouse models to study how HARs influence developmental gene expression and drive phenotypic evolution. His work has also involved mapping gene regulatory elements during mammalian organogenesis, identifying human regulatory innovations, and elucidating their roles in limb and neocortical development. Additionally, Dr. Noonan's research has explored the regulatory networks involved in neurodevelopmental disorders, including autism, and employed advanced genome editing and reporter assays to characterize enhancer functions during human brain development.
Research topics
- Computational biology
- Biology
- Genetics
- Evolutionary biology
- Cell biology
Selected publications
Modeling uniquely human gene regulatory function via targeted humanization of the mouse genome
Nature Communications · 29 citations
Senior authorCorresponding- Biology
- Genetics
- Cell biology
Abstract The evolution of uniquely human traits likely entailed changes in developmental gene regulation. Human Accelerated Regions (HARs), which include transcriptional enhancers harboring a significant excess of human-specific sequence changes, are leading candidates for driving gene regulatory modifications in human development. However, insight into whether HARs alter the level, distribution, and timing of endogenous gene expression remains limited. We examined the role of the HAR HACNS1 (HAR2) in human evolution by interrogating its molecular functions in a genetically humanized mouse model. We find that HACNS1 maintains its human-specific enhancer activity in the mouse embryo and modifies expression of Gbx2, which encodes a transcription factor, during limb development. Using single-cell RNA-sequencing, we demonstrate that Gbx2 is upregulated in the limb chondrogenic mesenchyme of HACNS1 homozygous embryos, supporting that HACNS1 alters gene expression in cell types involved in skeletal patterning. Our findings illustrate that humanized mouse models provide mechanistic insight into how HARs modified gene expression in human evolution.
International Journal of Molecular Sciences · 2026-03-19
articleOpen accessThe development of the human brain starts with the orchestrated expression of our genes during embryogenesis. Non-protein-coding DNA sequences (gene promoters and enhancers) dynamically interact to form a three-dimensional (3D) network, orchestrating gene expression. We discuss novel perspectives on how DNA sequence variants within regulatory DNA, identified by whole-genome sequencing (WGS), contribute to the development of neurodevelopmental disorders (NDDs), including autism spectrum disorders (ASDs). We discuss two recent models explaining the evolution of a subset of regulatory sequences, Human Accelerated DNA Regions (HARs), proposed to be involved in the evolution of uniquely human brain features through their participation in the 3D interactions network. We connect this with the recent proposal that rare, recessive inherited sequence variants within HARs, interacting with distant target genes in neural cells, represent risk factors for the development of ASDs. The SOX2 transcription factor, whose heterozygous mutation causes NDDs, shapes the noncoding-DNA interaction network in neural cells, and binds DNA together with FOS, whose recognition sequence is enriched within HARs carrying human-specific substitutions modulating enhancer activity. SOX2 also binds regulatory regions (including HARs) carrying ASD-associated mutations. We highlight research directions based on these findings, which will hopefully improve our understanding of the connection between SOX2-dependent gene regulatory networks, NDDs, and brain evolution.
Author Correction: CpG island turnover events predict evolutionary changes in enhancer activity
Genome biology · 2025-10-22
erratumOpen accessSenior authorCorrespondingUtrecht University Repository (Utrecht University) · 2025-10-22
otherOpen accessFollowing publication of the original article [1], the authors reported an error in the description of the confidence interval shown by box-and-whisker plots in Figs. 1C, 1D, 2C, 2D, and 3E. Previously the legends for these figure panels incorrectly reported that whiskers indicate the 90% confidence interval. They have now been corrected to state that “Box plots show the interquartile range and median, and whiskers indicate the 80% confidence interval.” The same correction has been made to the legends of the following supplementary figures in Additional file 1: Fig. S4B, panels A and B of Figs. S8-11, Figs. S15-19, and Fig. S31. Corrected legends now state that “Box plots show the interquartile range and median, and whiskers indicate the 80% confidence interval.” These errors do not change any results and conclusions of the paper. The original article [1] has been corrected.
Cell Genomics · 2025-09-17 · 4 citations
articleOpen accessSenior authorpostnatal excitatory cortical neurons, suggesting impaired synaptogenesis. Our findings reveal complex patterns of transcriptional dysregulation due to Chd8 haploinsufficiency, potentially with distinct impacts on progenitors and maturing neurons in the excitatory neuronal lineage.
Meritocracy, Backlash, and Fatalism: Tempering Discourses in Teacher Diversity Efforts
2025-01-01
article1st authorCorrespondingCell · 2025-06-21
erratumOpen accessSenior authorCell · 2025-01-30 · 16 citations
articleOpen accessSenior authorMolecular Biology and Evolution · 2024-09-19 · 13 citations
articleOpen accessSenior authorTranscriptional enhancers orchestrate cell type- and time point-specific gene expression programs. Genetic variation within enhancer sequences is an important contributor to phenotypic variation including evolutionary adaptations and human disease. Certain genes and pathways may be more prone to regulatory evolution than others, with different patterns across diverse organisms, but whether such patterns exist has not been investigated at a sufficient scale. To address this question, we identified signatures of accelerated sequence evolution in conserved enhancer elements throughout the mammalian phylogeny at an unprecedented scale. While different genes and pathways were enriched for regulatory evolution in different parts of the tree, we found a striking overall pattern of pleiotropic genes involved in gene regulatory and developmental processes being enriched for accelerated enhancer evolution. These genes were connected to more enhancers than other genes, which was the basis for having an increased amount of sequence acceleration over all their enhancers combined. We provide evidence that sequence acceleration is associated with turnover of regulatory function. Detailed study of one acceleration event in an enhancer of HES1 revealed that sequence evolution led to a new activity domain in the developing limb that emerged concurrently with the evolution of digit reduction in hoofed mammals. Our results provide evidence that enhancer evolution has been a frequent contributor to regulatory innovation at conserved developmental signaling genes in mammals.
bioRxiv (Cold Spring Harbor Laboratory) · 2024-06-26 · 4 citations
preprintOpen accessSenior authorCorrespondingHuman Accelerated Regions (HARs) are highly conserved across species but exhibit a significant excess of human-specific sequence changes, suggesting they may have gained novel functions in human evolution. HARs include transcriptional enhancers with human-specific activity and have been implicated in the evolution of the human brain. However, our understanding of how HARs contributed to uniquely human features of the brain is hindered by a lack of insight into the genes and pathways that HARs regulate. It is unclear whether HARs acted by altering the expression of gene targets conserved between HARs and their chimpanzee orthologs or by gaining new gene targets in human, a mechanism termed enhancer hijacking. We generated a high-resolution map of chromatin interactions for 1,590 HARs and their orthologs in human and chimpanzee neural stem cells (NSCs) to comprehensively identify gene targets in both species. HARs and their chimpanzee orthologs targeted a conserved set of 2,963 genes enriched for neurodevelopmental processes including neurogenesis and synaptic transmission. Changes in HAR enhancer activity were correlated with changes in conserved gene target expression. Conserved targets were enriched among genes differentially expressed between human and chimpanzee NSCs or between human and non-human primate developing and adult brain. Species-specific HAR gene targets did not converge on known biological functions and were not significantly enriched among differentially expressed genes, suggesting that HARs did not alter gene expression via enhancer hijacking. HAR gene targets, including differentially expressed targets, also showed cell type-specific expression patterns in the developing human brain, including outer radial glia, which are hypothesized to contribute to human cortical expansion. Our findings support that HARs influenced human brain evolution by altering the expression of conserved gene targets and provide the means to functionally link HARs with novel human brain features.
Recent grants
NIH · $93k · 2007
Modeling uniquely human developmental gene regulatory networks using humanized mice
NIH · $2.8M · 2020–2026
Identifying enhancers with human-specific developmental functions
NIH · $5.8M · 2010–2020
Genetics and Genomics of Human Disease
NIH · $10.6M · 1978–2029
Frequent coauthors
- 90 shared
Edward M. Rubin
- 52 shared
Johannes Krause
Max Planck - Harvard Research Center for the Archaeoscience of the Ancient Mediterranean
- 52 shared
Doug Smith
- 42 shared
Shyam Prabhakar
Nanyang Technological University
- 37 shared
James R. Priest
Stanford Medicine
- 36 shared
Gernot Rabeder
University of Vienna
- 36 shared
Svante Pääbo
Max Planck Institute for Evolutionary Anthropology
- 36 shared
Nadin Rohland
Labs
Education
Ph.D., GENETICS
YALE UNIVERSITY
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