Introduction

The cerebellum is one of a few structures in the mammalian brain possessing a discrete set of neurons that can be assigned to specific functions relative to their neurotransmitter phenotype (i.e., glutamatergic or GABAergic) and has a focused output on motor control. Thus, perturbations of these highly ordered arrays can be easily assessed at both anatomical and functional levels. These qualities of the cerebellum made it one of the first tractable regions of the brain to identify (and then screen) for mutations that resulted in aberrant morphology and motor function. The first concerted cataloging of the genetic loci that impact cerebellar function was part of a larger pioneering effort that culminated in 1965 with the publication of the “Catalog of the Neurological Mutant of the Mouse” by Richard Sidman, Margaret Green, and Stanley Appel [1]. This catalog led to a relative flood of research papers in the 1970s and beyond, largely in France, Japan, and the USA, that detailed the use of mice that had mutations in these loci to elucidate the genetic bases of cerebellar development and function. Around the time of the Mouse Mutant Catalog [1], there began a pioneering effort to catalog the mutations in humans that resulted in aberrant function. Victor McKusick published the first catalog of Mendelian Inheritance in Man in 1966 [2]. Since then, a large number of Mendelian mutations in humans affecting cerebellar structure and function have been logged into the modern version of the human catalog — “Online Mendelian Inheritance in Man” (OMIM, https://omim.org/). With the arrival of gene cloning and sequencing technologies that culminated in the full sequences of the human and mouse genomes, the genes responsible for these mutants have been identified.

Resources for the examination of gene expression at anatomical and molecular levels over time have provided valuable tools to probe genes of interest [3,4,5,6,7]. The recent spate of single-cell/nuclei RNAseq data over developmental time has greatly enriched this knowledge environment [8,9,10,11,12]. We and others provided early efforts to identify genes altered in single-gene mutations that impacted cerebellar development [5, 13,14,15,16]. These advances in gene databases are matched with the exciting advances in our understanding of cerebellar function, particularly in the realm of non-motor function [17,18,19,20,21,22,23,24].

With this publication, we sought to cull these datasets to highlight the many genes in the mouse and human that are critical to cerebellar development. Importantly, we sought to see how the work in the mouse intersects with efforts to understand genes involved in human cerebellar development and functions. We see this as an initial and ever-expandable dataset to be used as a reference to explore the genetic bases of cerebellar development and function in mice and humans.

Methods

Mouse Genome Informatics (MGI) Database Mining

We used the “Genes and Markers Query” tool (http://www.informatics.jax.org/marker) for our search for genes with cerebellar phenotypes in mice using the following parameters: Using the “Mouse phenotypes and mouse models of human disease” search function, we used the term “cerebellum.” This search returned a list of 549 genes with potentially a cerebellar phenotype. Phenotypes were then retrieved for cerebellar genes by using the “MGI Batch Query” tool on the MGI website. For the output of this search, we chose “Nomenclature” under Gene Attributes, and “Mammalian Phenotype (MP)” under Additional Information. The input for this analysis was the 549 genes identified in the initial query. The references/sources for phenotypes were retrieved from “Mammalian Phenotype Ontology Annotations” for each gene. To filter these phenotypes for those found within the cerebellum, we constructed a list of cerebellar and brain centric terms to use as parameters (Table 1). For phenotypes that were not specific to the cerebellum, the referenced study was examined to identify whether the phenotype was specifically observed in the cerebellum. If the phenotype was found in the cerebellum, it was kept. A gene was removed from the database if none of the phenotypes occurred in the cerebellum.

Table 1 Cerebellar- and brain-centric terms used to filter phenotypes retrieved from MGI. Terms in this table served as an initial filter for cerebellar phenotypes. If a phenotype contained one of these terms, it was considered for further examination
Full size table

PubMed Literature Search

For a subset of mouse genes, we identified cerebellar phenotypes through a literature search in PubMed (https://pubmed.ncbi.nlm.nih.gov/). Articles were individually curated for studies that have previously created a knockout mouse for a given gene and identified a cerebellar phenotype. This literature search has been conducted over the years by the lab and has previously been used as a database of references for cerebellar genes. In total, 161 PubMed articles were accessed to identify genes that when perturbed result in a cerebellar phenotype. In the second section of the database, “Mouse Cerebellar Phenotypes,” genes/phenotypes with a listed PubMed ID (PMID) in the “Source” column are genes that were identified in our PubMed literature search but were not recorded in MGI as having a cerebellar phenotype. Genes/phenotypes that overlapped between the two were given the corresponding MGI Phenotype ID and J number for their phenotypes and sources, respectively.

OMIM Database Mining

To identify loci associated with human disorders with cerebellar phenotypes, we conducted a comprehensive search on the Online Mendelian Inheritance in Man (OMIM) database (https://www.omim.org/). We utilized the primary search function, using “cerebellum” as the keyword. From the result of this search, we downloaded the “Gene Map Table” containing “Phenotype Only Entries.” A table containing human disorders with cerebellum included in their phenotypes and their associated loci was retrieved from this search. To refine the list of human disorders to those with a cerebellar phenotype, the term “cerebellum” was entered into the “Clinical Synopsis Advanced Search” tool on OMIM (https://www.omim.org/search/advanced/clinicalSynopsis). We used this list of disorders to filter our Gene Map Table for phenotypes with a cerebellar phenotype by matching OMIM Phenotype ID numbers.

Results

Database Access and Summary

The Cerebellar Gene Database can be accessed online at https://cbgrits.org/Database/CerebellarGene. A summary of the input sources and how they contributed to the Cerebellar Gene Database is outlined in Fig. 1. The provided “User Guide” (Supplementary File 1) details how to navigate the online resource and outlines the various capabilities such as filtering, exporting, and contributing.

Fig. 1
figure 1

Flow chart describing the input sources and data extracted from these databases during the construction of the Cerebellar Gene Database. The bottom displays the URL that can be used to access the database online

Full size image

Constructing a Mouse Cerebellar Gene Database from MGI and PubMed

In this section of the database, we sought to amass an atlas of genes that, when knocked out in the mouse, resulted in a cerebellar phenotype. Our first step was to mine the Mouse Genome Informatics (MGI) database (http://www.informatics.jax.org/), an international database resource for the laboratory mouse which provides integrated genetic, genomic, and biological data. We conducted an initial search for protein coding genes that may have a cerebellar phenotype which resulted in an initial list of 549 genes. The phenotypes as a result of perturbation of these genes were then filtered for those found within the cerebellum. To do this, we constructed a list of cerebellar- and brain-centric terms to use as parameters (Table 1). Filtering resulted in a list of 504 genes with a potential cerebellar phenotype.

We then retrieved the references for each of these phenotypes from MGI. These were hand-annotated for phenotypes that did not specifically involve the cerebellum. For example, the term “abnormal axon morphology” (MP:0005404) may have been highlighted as a cerebellar phenotype when in fact it may not have necessarily occurred in the cerebellum but only as part of the overall pleiotropic outcome of the mutant gene. After this filtering step, our list consisted of 464 genes and 213 unique ontologically defined phenotypes retrieved from the MGI database. To compile a comprehensive list of cerebellar genes and their related phenotypes, a set of genes that were identified directly from research articles in PubMed were added. During the construction of this database, the list of genes identified by our literature search stood at 150 genes from 126 articles. We found that several genes in our PubMed-derived list overlapped with the MGI cerebellar database, identifying 94 genes that were not recorded in MGI with a cerebellar phenotype. We then combined the genes identified through MGI with our literature-based curated list and obtained a total of 543 genes and 213 unique phenotypes.

General information about these mouse genes is provided in the first section of the online Cerebellar Gene Database entitled “Mouse Cerebellar Genes.” For each gene, the data table provides the gene name, chromosomal location, starting and ending positions, centimorgan (cM) location, strand, and the MGI ID with a link to the dedicated webpage on MGI (Table 2).

Table 2 Overview of the contents of the “Mouse Cerebellar Genes” section of the Cerebellar Gene Database
Full size table

The retrieved cerebellar phenotypes and their corresponding genes are detailed in the second section of the online Cerebellar Gene Database entitled “Mouse Cerebellar Phenotypes.” This table includes the associated gene name, MGI Gene ID and MGI Phenotype ID to a corresponding webpage on MGI, and the source as a MGI J number (Table 3).

Table 3 Overview of the contents of the “Mouse Cerebellar Phenotypes” section of the Cerebellar Gene Database
Full size table

Identifying a Comprehensive Catalog of Cerebellar Human Disorders and Associated Loci

We then compiled a catalog of human disorders with cerebellar phenotypes and associated genomic loci. To do so, we searched the Online Mendelian Inheritance in Man (OMIM) database (https://omim.org/) to identify any disorders with a cerebellar phenotype described in the clinical synopsis. Additionally, we retrieved information on any loci that have been previously associated with these disorders. We identified 682 human disorders involving a cerebellar phenotype associated with 630 mutant loci that result in a cerebellar phenotype in humans. As validation for our approach, we identified several well-known human disorders with cerebellar phenotypes such as Joubert syndrome, Dandy-Walker syndrome, and spinocerebellar and Friedreich ataxias [25]. We also opted to include disorders with evidence of pleiotropy, in which the cerebellar abnormalities were one of several phenotypes.

The third section of the Cerebellar Gene Database, entitled “Human Cerebellar Genes,” details information about the genes/loci associated with human disorders with cerebellar phenotypes including the gene/locus symbol and name, cytogenetic location, genomic coordinates, OMIM IDs with a corresponding link to the gene webpage on OMIM, comments from OMIM about mutations related to the corresponding phenotype, and the mouse ortholog (Table 4).

Table 4 Overview of the contents of the “Human Cerebellar Phenotypes” section of the Cerebellar Gene Database
Full size table

Ortholog inferences were retrieved from MGI, which uses orthologs defined by the Alliance of Genome Resources using the DRSC Integrative Ortholog Prediction Tool (DIOPT). DIOPT integrates human, mouse, fly, worm, zebrafish, and yeast ortholog predictions made by 12 different algorithms based on sequence homology, phylogenetic trees, and functional similarity. DIOPT ranks orthologs based on a score indicating the number of tools that support a given orthologous gene-pair relationship. MGI defines an ortholog using the DIOPT stringent set of criteria: “An ortholog called by 3 or more methods is included if it is a best count or a best reverse count.” This section of the database also includes information on the human disorders with cerebellar phenotypes including inheritance pattern, OMIM IDs with links to OMIM webpages describing the disorder, and a Phenotype Map Key. The Phenotype Map Key from OMIM indicates a score of 1–4 corresponding to the following: (1) the disorder was positioned by map** of the wild-type gene; (2) the disorder itself was mapped; (3) the molecular basis of the disorder is known; or (4) the disorder is a chromosome deletion or duplication syndrome.

Connecting Mouse Models and Human Cerebellar Genes and Disorders

Identifying genes that, when perturbed in mice and humans, result in a cerebellar phenotype allowed us to examine the proportion of human genes that have been investigated using the mouse as a model system. We identified that 603 of the disorder-associated human loci involved a mutation in a single gene. Among these genes, 588 (97.5%) have an ortholog in the mouse, indicating that many of these genes are highly conserved. Strikingly, when compared to the cerebellar mouse gene list, only 126/588 (20.9%) of these genes have previously been knocked out in the mouse and have an observed cerebellar phenotype. This unexpected finding indicates that the majority of conserved genes that result in a cerebellar abnormality in humans have yet to be studied in the context of the mouse cerebellum. We predict that investigating these genes in the mouse model system will provide insights into the etiology of the cerebellar phenotypes observed in these disorders. The genes overlap** between mouse and human cerebellar genes represent only 27.2% (126/464) of the cerebellar mouse genes that have a human ortholog associated with a human disorder with a cerebellar phenotype. The remaining 74.8% of the cerebellar mouse genes may result in perturbed cerebellar function in humans; however, variants within these genes have yet to be identified. Supplementary Table 1 summarizes the genomic location, mouse phenotypes, human disorders, and general classification and functions (Gene Ontology) of the 126 overlap** genes. Expectedly, these genes are enriched for GO terms “cerebellum development” and “cerebellum morphogenesis,” serving as validation for our approach. This analysis has revealed that overlap** genes are enriched for functions such as calcium ion transport, neurite growth, and myelination (Supplemental Fig. 1). In Supplementary Table 1, we also provide links to online sources describing expression pattern in mice from the Gene Expression Database (http://www.informatics.jax.org/expression.shtml) and in humans from the Protein Expression Atlas (https://www.proteinatlas.org/). Overall, our database will serve as a rich resource of potential candidate genes for sequencing for cerebellar disorders/phenotypes with unknown genetic origin and for investigation in the mouse model for their potential role in cerebellar development and function.

Discussion

The Cerebellar Gene Database is a timely and novel contribution to the cerebellar research community. Our curated database is the first resource, to our knowledge, that consists solely of genes critical for cerebellar development and function; and catalogs their phenotypes when perturbed in both mouse and humans. Larger gene databases, such as MGI and OMIM, are typically more comprehensive and lack focus on a particular tissue or subregion of a given tissue. In the context of the cerebellum, Sato et al. [6] previously developed the Cerebellar Development Transcriptome Database (CDT-DB). While this database provides a useful tool for evaluating temporal and spatial expression patterns in the cerebellum and provides links to several other resources, this database does not curate genes specifically important for the cerebellum and lacks any phenotypic information. The Cerebellar Gene Database thus provides a novel and central resource that has been missing in the field.

In comparing mouse and human cerebellar genes, we identified a vast disparity between the gene lists. The result of this comparison provides a list of genes to be studied in the mouse model or candidates for human disorders with cerebellar phenotypes without a known genetic origin. However, it is important to acknowledge that this discrepancy may be partially due to cerebellar defects being missed for a variety of reasons. The researchers may not be experts in cerebellar phenotypes or simply were focused on other regions of the brain. Many phenotypes and their associated genes may not have been documented in MGI or OMIM. Phenotypes may also have been overlooked in previous studies due when motor-deficits were not obvious. More recently, the cerebellum has been associated with non-motor functions which highlights the importance evaluating/re-evaluating the impact of cerebellar phenotypes cognitive functions [22, 26]. The Cerebellar Gene Database will undoubtedly help facilitate these efforts, driving forward our understanding of cerebellar function.

With the aspiration that the study of mouse models of genetic disorders can be translated into the development of diagnostic and/or therapeutic interventions, it is important to understand the etiology of the genetic disorders in question. Examples abound of genes initially discovered in mice that are later shown to inform human etiology, as well as the usefulness of mouse models in further elucidating the mechanisms by which genes initially discovered in humans drive disease processes.

An example of how findings in the mouse lead to discoveries in the human is Zic1 which was first studied in mice due to its exclusive expression in the nervous tissue. Within the cerebellum, Zic1 is abundantly expressed in the granule cells [27]. Subsequent studies revealed that Zic1 is involved in the neurogenesis of granule cells. Significantly, heterozygous deletion of the homologous genes ZIC1 and ZIC4 has been shown to be involved in the Dandy-Walker malformation [13], a neurodevelopmental disorder characterized by hypoplasia of the cerebellar vermis and cystic dilation of the fourth ventricle. The discovery of the importance of Zic1/ZIC1 in cerebellar development exemplifies the use and importance of mutant mouse models in illuminating the etiology of human diseases.

On the other hand, there are also examples of genes first identified in humans that are then explored in the mouse. Of particular note is the exploration of the cerebellum’s role in the etiology of ASD. A prime example is the tuberous sclerosis complex (TSC). Mutations in the human TSC1 and TSC2 genes are often attended with comorbid phenotypes associated with autism spectrum disorders (ASDs) [28]. These initial findings in the human presented exciting potential for exploration in mouse models as an approach to discover the syndromic causes of ASD and possible therapeutic strategies. Through the generation of mutant mouse strains harboring conditional knockout of either the Tsc1 or Tsc2 gene in the cerebellar Purkinje cells (PCs) [29, 30], the causative roles of the TSC genes in ASDs have been demonstrated with promising outcomes. Namely, the loss of either Tsc1 or Tsc2 in the cerebellar PCs results in ASD-like phenotypes including repetitive behaviors and severe social behavior deficits. But importantly, the investigators discovered that administration of the mTOR inhibitor, Rapamycin, can prevent many of the ASD-like phenotypes exhibited by the mutant mice. These seminal studies illustrate the effectiveness of mutant mouse models in not only uncovering disease mechanisms, but also identifying potential therapeutic strategies. Additionally, the ability to use conditional knockouts involving the targeted elimination of a specific gene in a specific cell type (in this case, the PCs) highlights the ability for a finer dissection of genetic causation using mouse models and identifies a solid link between cerebellar perturbations and the etiology as well as the pathology of ASDs.

Our hope in amalgamating the Cerebellar Gene Database is to inform and inspire clinicians and neurogenetic researchers in the study and treatment of cerebellar disorders, by providing a resource for gathering background information and creating hypotheses. This database will prove to be useful in identifying genes with mutations associated with disorders which have yet to be modelled in mice, as demonstrated by the comparisons conducted in this study. One example is EBF3/Ebf3, which is a transcription factor belonging to the early B cell factor protein family involved in neuronal differentiation and maturation [31,32,33]. Deficits in EBF3 function result in hypotonia, ataxia and delayed development syndrome (HADDs) [

Data Availability

Data can be directly downloaded from the online database resource upon registration: https://cbgrits.org/Database/CerebellarGene

Change history

  • 08 August 2022

    Supplementary file "The Cerebellar Gene Database" is added.

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Authors and Affiliations

  1. Centre for Molecular Medicine and Therapeutics, BC Children’s Hospital Research Institute, 950 W 28th Ave, Vancouver, BC, V6H 3V5, Canada

    Miguel Ramirez, Joshua Wu, Matthew Liu, Derek Wu, Dave Weeden & Daniel Goldowitz

  2. University of British Columbia, Vancouver, BC, V6T 1Z4, Canada

    Miguel Ramirez, Joshua Wu, Matthew Liu, Derek Wu, Dave Weeden & Daniel Goldowitz

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  1. Miguel Ramirez
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  2. Joshua Wu
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  3. Matthew Liu
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Contributions

Conceptualization: Dr. Miguel Ramirez, Dr. Daniel Goldowitz; methodology: Dr. Miguel Ramirez, Dr. Daniel Goldowitz; formal analysis and investigation: Dr. Miguel Ramirez, Joshua Wu, Matthew Liu, Derek Wu; online database construction: Dave Weeden, Dr. Miguel Ramirez; writing—original draft preparation, review, and editing: Dr. Miguel Ramirez, Joshua Wu, Matthew Liu, Derek Wu, Dr. Daniel Goldowitz; funding acquisition: Dr. Daniel Goldowitz; supervision: Dr. Daniel Goldowitz.

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Correspondence to Daniel Goldowitz.

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Ramirez, M., Wu, J., Liu, M. et al. The Cerebellar Gene Database: a Collective Database of Genes Critical for Cerebellar Development. Cerebellum 21, 606–614 (2022). https://doi.org/10.1007/s12311-022-01445-w

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