Abstract
Crim1 has been implicated in cataracts in mice and is of great importance in the development of the eye in both humans and mice. Therefore, we aimed to clarify how Crim1 mutations affect lens development and the molecular mechanism of cataracts in mice through comprehensive bioinformatics analysis. The microarray chip was downloaded from the GEO database to obtain the gene expression profile data set. Differentially expressed genes (DEGs) were screened using the limma package. GO and KEGG analyses of DEGs were performed using the DAVID database. Then, we established the protein–protein interaction (PPI) network in Cytoscape. Next, we used MCODE to analyze the data. We obtained 750 DEGs in total, including 407 upregulated DEGs and 343 downregulated DEGs. GO analysis showed that the DEGs were mainly related to biological processes, such as apoptosis, cell translation and the immune system. KEGG analysis showed that the enriched functions and pathways were related to the processing and presentation of ribosomes, lysosomes, and antigens. We identified 18 HUB genes, among which four core genes, C1qa, C1qb, C1qc, and Cd74, were closely related to congenital cataracts induced by Crim1 mutation. This study reveals the molecular pathogenesis of congenital cataracts induced by Crim1, and this information is expected to facilitate clinical genetic testing, molecular diagnosis, prognosis, and individualized chemotherapy for congenital cataracts (CC).
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Introduction
Abnormal metabolism of the lens and decreased transparency are involved in congenital cataracts, which can cause blindness in severe cases. Approximately 1/4 of cases of congenital cataracts are caused by genetic defects (Wang et al 2016). Therefore, screening and identification of mutated genes that cause congenital cataracts can help us to understand the pathogenesis of congenital cataracts. At present, congenital cataracts are associated with greater than 200 gene mutations (Liu et al. 2018), including mutations in the crystallin gene and cytoskeleton protein gene (Zhou et al. 2018). With the development of molecular genetics, especially gene technology, an increasing number of gene mutations have been demonstrated to be related to the pathogenesis of congenital cataracts. Studies have shown that mutation of any gene involved in lens development may lead to congenital cataract (Shiels et al. 2007). In addition, acetylation of crystallin is also related to the occurrence of congenital cataract. However, the occurrence and development of CC result from numerous types of intermolecular interactions. Therefore, we explored the complex molecular relationship in the development of congenital cataracts and provided evidence for the pathogenesis, early diagnosis, and treatment of CC.
Cysteine-rich motor neuron 1 (Crim1) is involved in the function of various organs and affects intercellular connections by regulating integrin signals (Zhang et al. 2016). As a growth-factor-binding protein, crim1 plays an important role in the development of multiple organs, including eye. First, in the lens pit stage, Crim1, which is expressed in the lens epithelial cells and fiber cells, is significantly upregulated and continues to be expressed at a high level throughout embryonic and fetal development. During the maturation of lens fibers in the nucleus, Crim1 is strongly expressed in lens epithelial cells and fiber cells of the lens cortex (Lovicu et al. 2000). In addition, previous studies have shown that Crim1 mutations are responsible for congenital cataracts in subtype and null mutant mouse models (Tam et al. 2018; Pennisi et al. 2007; Chiu et al. 2012; Beleggia et al. 2015). Tight regulation of crim1 activity contributes to the maintenance of lens epithelium, and its deficiency would lead to ectopic differentiation into fiber cells and dramatically alter lens structure (Tam et al. 2018). Lens cells can potentially respond to activin, TGF-β superfamily, and bone morphogenetic protein (BMP) signals, which are related to lens sensing and lens fiber elongation during differentiation. Crim1 interacts with the TGF-β superfamily and BMP. Studies on Xenopus embryos showed that the Crim1 cytoplasmic domain could bind to N-cadherin and β-Catenin, thereby adjusting the makeup of the neurocutaneous adhesion complex. Biochemical analysis of Crim1 showed that Crim1 could bind to BMP and inhibit the production and secretion of BMP (Chiu et al. 2012). In the process of lens development, Crim1 function involves the levels of the β1 integrin. Studies of the β1 integrin signaling pathway revealed that Crim1 can bind to the membrane, thus changing the phosphorylation status of the downstream effectors FAK and ERK and affecting the morphogenesis of the lens (Iyer et al. 2016). Therefore, knowledge on the mechanism of congenital cataracts induced by Crim1 mutations can further predict the occurrence and development of congenital cataracts and provide some guidance for early identification and intervention treatment of congenital cataracts.
Because the human genomes exhibits similarity with the mouse genome, mouse models have been a very useful tool to understand the mechanism of cataracts. We learned much about the pathogenesis of congenital cataracts through a mouse model (Huang et al. 2010; Graw 2009), so we chose the genetic data of mice for analysis. Bioinformatics analysis has become a promising strategy for comprehensive analysis of a large number of data, including complex genetic information. In our study, we used mature bioinformatics tools to screen potential genes in congenital cataracts induced by Crim1 mutations. We chose an open access database called the gene expression omnibus (GEO) database, in which the appropriate mRNA map was selected. The differentially expressed genes (DEGs) between crim1 mutant and wild-type mice were analyzed using the limma package. In our study, we downloaded the GSE62561 mRNA microarray dataset from GEO. The functional and pathway enrichment analysis of DEGs was implemented using the DAVID database. The PPI network was establish through STRING and visualized with Cytoscape. The modularization of the PPI network is obtained through MCODE. This information will lay a foundation for further elucidating the molecular pathway and mechanism of congenital cataracts.
Materials and Methods
Subjects and Gene Information
GEO is an international genetic information database consisting of microarrays and next-generation sequencing data that is free to researchers. In this study, a gene expression profile (GSE62561) was searched and screened from the GEO database. As shown in \* MERGEFORMAT Table 1, GSE62561 contained two lens epithelium samples of Crim1 mutant mice and two lens epithelium samples of wild-type mice. The mutant mice is from mice homozygous for a hypomorphic mutation of Crim1 Crim1glcr11 at P60 created by a ENU-induced transition mutation in intron 13. And this variant creates a functional cryptic splice acceptor, resulting in a truncated protein. The wild-type mice that are heterozygous for this mutation is used for controls (Zhang et al. 2016).
Data Analysis
All data collected from GEO can be processed and normalized in a variety of ways. In this study, two groups of samples were processed and normalized using R language. The DEGs were analyzed by “limma” software package. Comparisons between the two groups were performed under the same experimental conditions. Here, corrected P < 0.05 and | logFC | (fold change) > 1 served as the screening criteria.
GO and KEGG Pathway Analysis
To provide a set of comprehensive functional annotation tools to classify different genes into several groups with different annotations, we used annotation, visualization and enrichment analysis and the DAVID database to analyze the GO and KEGG pathways of the identified DEGs to better understand the biological function of genes and distinguish significantly enriched genes with corrected P < 0.05.
PPI Network Visualization
We developed a quality-controlled pathogenic gene analysis table to evaluate the functional interactions between proteins by simulating the DEG PPI network. The STRING database and Cytoscape were used to visualize the PPI network. Then, molecular module detection (MCODE) is performed to select the appropriate PPI network module. The core genes of the PPI network were detected using CytoHubba.
Results
Screening of Differentially Expressed Genes
We found 750 genes altogether in the standardized dataset GSE62561 (Fig. 1a). Basic information about DEGs is in supplement ESM_1. Compared with wild-type mice, 407 genes were upregulated in mutant mouse lens tissue, and 343 genes were downregulated in mutant mouse lens tissue (Fig. 1b, c).
Enrichment Analysis of GO and KEGG Pathways
The enrichment analysis of GO and KEGG pathways of DEGs was carried out on the DAVID platform for an even better comprehension of the different functions of specific DEGs. GO analysis demonstrated that the DEGs were mainly involved in apoptosis, cell translation, and immune system processes (Fig. 2, 3). KEGG pathway enrichment analysis showed that abundant functions and pathways included ribosome, lysosome, and antigen processing and presentation (Fig. 4).
PPI Network Construction
We screened out 202 pathogenic genes from DEGs, excluded unclosely related differentially expressed proteins according to the degree of their interaction, and selected 155 nodes and 566 edges altogether to draw the network of PPIs, which contained 136 genes with excessive expression and 19 genes with reduced expression (Fig. 5a). The top ten core genes of the PPI network were screened by CytoHubba (Fig. 5b), among which C1qa, C1qb, C1qc, and Cd74 are presented in the darkest color and had the most significant effect on the network. Then, using degree ≥ 10 as the cut-off value, a key module consisting of 18 genes (C1qa, C1qb, C1qc, and Cd74) was identified (Fig. 5c). Functional enrichment showed that the genes of this module were primarily related to immune system processes, antigen processing and presentation, MHC class II antigen processing and presentation, and MHC class I antigen processing and presentation (Fig. 6, 7). KEGG pathway enrichment analysis is shown in \* MERGEFORMAT Table 2, and genes in this module were mostly related to Staphylococcus aureus infection, graft-versus-host disease and allograft rejection (Fig. 8a). In addition, in order to further explore the role of C1q in congenital cataract, we also explored the classical complement activation pathway (Fig. 8b).
Discussion
Congenital cataracts often give rise to visual disturbance and even blindness in children worldwide (Li et al. 2020). Early diagnosis is important in postpartum wards or communities given appropriate intervention can lead to a good level of visual function (Roche et al. 2006). In mutant and spontaneous null mouse models, Crim1 is one of the key genes causing congenital cataracts (Tam et al. 2018; Pennisi et al. 2007; Chiu et al. 2012; Beleggia et al. 2015). Therefore, this study will have a certain guiding influence on the early diagnosis and intervention of congenital cataracts by clarifying how Crim1 mutations affect lens development and the molecular mechanism of cataracts in mice through comprehensive bioinformatics analysis. However, the mechanism of the transcriptomic changes induced by deleterized CRIM1 remains to be further investigated, and the analysis and identification of the differential expression of related genes in this paper provide directions for this investigation.
A total of 750 DEGs were identified by downloading the GSE62561 dataset from the GEO website, including 407 genes with excessive expression and 343 genes with reduced expression. GO analysis showed that these differentially expressed genes were primarily affiliated with apoptosis, cell translation, and immune system processes. KEGG pathway enrichment analysis shows that abundant functions and pathways include the processing and presentation of ribosomes, lysosomes, and antigens. In addition, a key module consisting of 18 genes was identified in these DEGs. Among them, C1qa, C1qb, C1qc, and Cd74 exhibited the highest degrees of altered expression. The study of functional enrichment proved that the genes contained in this module were primarily related to immune system processes, antigen processing and presentation, MHC class II antigen processing and presentation, and MHC class I antigen processing and presentation. KEGG pathway enrichment analysis showed that the genes in this module were mostly related to Staphylococcus aureus infection, graft-versus-host disease, and allograft rejection.
Analysis of C1QA, C1QB, and C1QC
Among the four genes with the highest degree of expression, the C1QA, C1QB, and C1QC genes encode the main component of human complement subfraction C1q (Stasi et al. 2006). In the immune system, C1q is the recognition domain of the initiation protein C1 in the classical complement system that binds to the apoptotic cell membrane or pathogenic agents, triggering the proteolysis cascade of downstream complement proteins that lead to the conditioning and phagocytosis of C3 by macrophages expressing complement receptors (Bialas et al. 2013). As the promoter of the classical complement cascade, C1q is the key modulation node of this pathway. Some studies have shown that the amount of complement C3 in the peripheral blood of sick patients with congenital cataracts is dramatically decreased, and the reduction of complement C3 is a risk factor for congenital cataracts (Shi et al. 2003; Ge et al. 2014; Shao et al. 2017; Li et al. 2017). In addition, complement deposition was also observed in the lens of mice with inflammatory damage (Montalvo et al. 2007). Therefore, the etiological mechanism of congenital cataracts is potentially related to the activation of the complement system. C1q ultimately leads to the conditioning and phagocytosis of C3 by complement receptor macrophages, so the amount of complement C3 is a risk factor for congenital cataracts and indirectly implies the inducing effect of C1q on the occurrence and development of congenital cataracts. In addition, new relationships among TGF-β signaling, the complement system and synaptic removal have been noted. During central nervous system development, the TGF-β cytokine signaling pathway initiates complement-dependent synaptic refinement by regulating C1q expression (Town et al. 2008; Fonseca et al. 2004; Afagh et al. 1996; Stevens et al. 2007; Bialas et al. 2013). Abnormal upregulation of complement may trigger synaptic elimination pathways in neurodevelopment and lead to synaptic loss in the disease. Synaptic loss and/or dysfunction represent the primary characteristics of degenerative neurodegeneration (Bialas et al. 2013). In this study, the C1qa, C1qb, and C1qc genes were upregulated in mutant mice, suggesting that the early development of congenital cataracts may activate the classical complement system, leading to synaptic disorders and neurodegenerative diseases, thus promoting the development of CC. C1q exhibits decreased expression in the normal major central nervous system; however, in the glaucoma mouse model, C1q is upregulated and synaptically relocated in the adult retina in the preliminary periods of the disease (Stevens et al. 2007). In addition, some researchers have found that the pathogenesis of congenital cataracts caused by TDRD7 deficiency may be related to the immune response, defence response, and related genes LY86, C1QA, C1QB, and C1QC (Shao et al. 2015). Therefore, C1qa, C1qb, and C1qc may also be involved in the pathogenesis of congenital cataracts caused by Crim1 mutation, and these proteins may also be related to neurodegenerative diseases (Fig. 8b).However, the complement C1q protein domain was significantly downregulated in the lens of Tdrd7 cataractous mutant mice, which we hypothesized might be related to mutations in different genes. However, in the lenses of Tdrd7 cataract mutant mice, the complement C1q protein domain was significantly downregulated, contrary to our findings, which we speculate may be related to mutations in different genes. At present, the specific mechanism of lens transcriptomic changes in Tdrd7 cataract mutant mice is not clear, and more research is needed in the future.
Analysis of CD74
As a type II transmembrane protein, CD74 (also known as MHC class II invariant chain) is affiliated with the transport of MHC class II molecules in antigen presenting cells. CD74 is a member of the MIF (macrophage migration inhibitory factor) receptor complex and its signal components CD44 and/or chemokine receptors CXCR2 and CXCR4 (Schwartz et al. 2012; Leung et al. 2004; Benedek et al. 2013). MIF can aggravate allergic and inflammatory diseases in humans (Rossi et al. 1998; Nagata et al. 2015). In addition, as a widely expressed pluripotent cytokine, MIF exhibits extensive immune and inflammatory activities. The cell surface morphology of CD74 facilitates binding with MIF to activate its related functions. Its high expression is related to different diseases with the same inflammatory characteristics (Sanchez-niño et al. 2009; Martín-ventura et al. 2009; Marsh et al. 2009; Borghese et al. 2011). The combination of MIF and CD74 mediates ERK activation and cell proliferation and inhibits apoptosis and prostaglandin E2 production (Calandra et al. 2003; Wang et al. 2014). In the lens, MIF mRNA is expressed in differentiated epithelial cells during development, which may enhance the growth of cells and cytodifferentiation (Wang et al. 2017). The increase in MIF mRNA abundance in the lenses of cataract rats is affiliated with the proliferation of undifferentiated epithelial cells (Wen et al. 1996). In addition, blocking the binding and downstream signal transduction of cytokines/chemokines, MIF and downstream signal transduction on monocytes and macrophages through CD74 receptors can inhibit brain reactive T cells without causing systemic immunosuppression (Wang et al. 2017; Vandenbark et al. 2013). Therefore, the upregulation of Cd74 may suggest that the occurrence and development of congenital cataracts caused by Crim1 mutations is related to the immune system, and pathway analysis also shows that Cd74 is affiliated with the immune system process, antigen processing and presentation, MHC class II antigen processing and presentation and MHC class I antigen processing and presentation.
Limitations
This paper lays a foundation for further elucidation of the molecular pathways and mechanisms of congenital cataracts. However, this article also has some limitations. First, the occurrence of cataracts in Crim1glcr11 mice may be associated with transcriptomic changes. At the same time, these changes are more likely to be the result of cataract formation, as Crim1glcr11 mice used for transcriptomic analysis have cataracts at P60. However, the etiological link between transcriptome changes and cataracts has not been clarified here, and further experiments are needed to verify this in the future. In addition, the expression of these key genes and their changes at the transcriptomic level will need to be further verified in future experiments.
Conclusion
In conclusion, through comprehensive biological analysis of the GSE62561 gene expression profile, a total of 750 DEGs were identified, of which C1qa, C1qb, C1qc, and Cd74 may be related to the occurrence and development of congenital cataracts caused by Crim1 mutations. Further studies are needed to clarify the association. The progression of congenital cataracts may be induced and aggravated by the immune system, classical complement system or antigen presentation pathway. Pathway intervention may have a certain guiding significance for the treatment of congenital cataracts. However, the predictive values of these genes and their pathways require further study before use in clinical practice. The underlying mechanism of the activity of these genes needs to be clarified, which will help to outline the predictive network of these genes.
Data Availability
The data used to support the findings of this study are included within the article.
References
Afagh A, Cummings BJ, Cribbs DH, Cotman CW, Tenner AJ (1996) Localization and cell association of C1q in Alzheimer’s disease brain. Exp Neurol 138(1):22–32
Beleggia F, Li Y, Fan J, Elcioğlu NH, Toker E, Wieland T, Maumenee IH, Akarsu NA, Meitinger T, Strom TM, Lang R, Wollnik B (2015) CRIM1 haploinsufficiency causes defects in eye development in human and mouse. Hum Mol Genet 24(8):2267–2273
Benedek G, Meza-Romero R, Andrew S, Leng L, Burrows GG, Bourdette D, Offner H, Bucala R, Vandenbark AA (2013) Partial MHC class II constructs inhibit MIF/CD74 binding and downstream effects. Eur J Immunol 43(5):1309–1321
Bialas AR, Stevens B (2013) TGF-β signaling regulates neuronal C1q expression and developmental synaptic refinement. Nat Neurosci 16(12):1773–1782
Borghese F, Clanchy FI (2011) CD74: an emerging opportunity as a therapeutic target in cancer and autoimmune disease. Expert Opin Ther Targ 15(3):237–251
Calandra T, Roger T (2003) Macrophage migration inhibitory factor: a regulator of innate immunity. Nat Rev Immunol 3(10):791–800
Chiu HS, York JP, Wilkinson L, Zhang P, Little MH, Pennisi DJ (2012) Production of a mouse line with a conditional Crim1 mutant allele. Genesis 50(9):711–716
Fonseca MI, Zhou J, Botto M, Tenner AJ (2004) Absence of C1q leads to less neuropathology in transgenic mouse models of Alzheimer’s disease. J Neurosci 24(29):6457–6465
Ge H, Li F (2014) Relationship between some relative factors of the complement alternative pathway and age-related macular degeneration. J Dali Med Univ 36(06):597–600 ((In Chinese))
Graw J (2009) Mouse models of cataract. J Genet 88(4):469–486
Huang B, He W (2010) Molecular characteristics of inherited congenital cataracts. Eur J Med Genet 53(6):347–357
Iyer S, Pennisi DJ, Piper M (2016) Crim1-, a regulator of developmental organogenesis. Histol Histopathol 31(10):1049–1057
Leung DY, Nicklas RA, Li JT, Bernstein IL, Blessing-Moore J, Boguniewicz M, Chapman JA, Khan DA, Lang D, Lee RE, Portnoy JM, Schuller DE, Spector SL, Tilles SA (2004) Disease management of atopic dermatitis: an updated practice parameter. Joint task force on practice parameters. Ann Allergy Asthma Immunol 93(3):1–21
Li S, Chen Y, Shao M, Tang L, Sun X, Cao W (2017) Association of plasma complement C3 levels with primary angle-closure glaucoma in older women. Invest Ophthalmol vis Sci 58(1):682–689
Li J, Chen X, Yan Y, Yao K (2020) Molecular genetics of congenital cataracts. Exp Eye Res 191:107872
Liu S, Zhu P, Ni M, Zhang M, Jiang W, Yu M, Zhang J, Wu Q, Li W, Xue C, Xia X (2018) A novel mutation of MIP in a Chinese family with congenital nuclear cataract identified by whole-exome sequencing. Ophthalmic Genet 39(1):139–140
Lovicu FJ, Kolle G, Yamada T, Little MH, Mcavoy JW (2000) Expression of Crim1 during murine ocular development. Mech Dev 94(1–2):261–265
Marsh LM, Cakarova L, Kwapiszewska G, von Wulffen W, Herold S, Seeger W, Lohmeyer J (2009) Surface expression of CD74 by type II alveolar epithelial cells: a potential mechanism for macrophage migration inhibitory factor-induced epithelial repair. Am J Physiol Lung Cell Mol Physiol 296(3):L442–L452
Martín-Ventura JL, Madrigal-Matute J, Muñoz-Garcia B, Blanco-Colio LM, Van Oostrom M, Zalba G, Fortuño A, Gomez-Guerrero C, Ortega L, Ortiz A, Diez J, Egido J (2009) Increased CD74 expression in human atherosclerotic plaques: contribution to inflammatory responses in vascular cells. Cardiovasc Res 83(3):586–594
Montalvo V, Campos MM, Chan CC, Wawrousek EF, Bush RA, Lambris JD, Gery I (2007) Complement deposits on ocular tissues adjacent to sites of inflammation. Curr Eye Res 32(11):917–922
Nagata Y, Yoshihisa Y, Matsunaga K, Rehman MU, Kitaichi N, Shimizu T (2015) Role of macrophage migration inhibitory factor (MIF) in pollen-induced allergic conjunctivitis and pollen dermatitis in mice. PLoS One 10(2):e115593
Pennisi DJ, Wilkinson L, Kolle G, Sohaskey ML, Gillinder K, Piper MJ, Mcavoy JW, Lovicu FJ, Little MH (2007) Crim1KST264/KST264 mice display a disruption of the Crim1 gene resulting in perinatal lethality with defects in multiple organ systems. Dev Dyn 236(2):502–511
Roche O, Beby F, Orssaud C, Dupont MS, Dufier JL (2006) Congenital cataract: general review. J Fr Ophtalmol 29(4):443–455
Rossi AG, Haslett C, Hirani N, Greening AP, Rahman I, Metz CN, Bucala R, Donnelly SC (1998) Human circulating eosinophils secrete macrophage migration inhibitory factor (MIF). Potential role in asthma. J Clin Invest 101(12):2869–2874
Sanchez-Niño MD, Sanz AB, Ihalmo P, Lassila M, Holthofer H, Mezzano S, Aros C, Groop PH, Saleem MA, Mathieson PW, Langham R, Kretzler M, Nair V, Lemley KV, Nelson RG, Mervaala E, Mattinzoli D, Rastaldi MP, Ruiz-Ortega M, Martin-Ventura JL, Egido J, Ortiz A (2009) The MIF receptor CD74 in diabetic podocyte injury. J Am Soc Nephrol 20(2):353–362
Schwartz V, Krüttgen A, Weis J, Weber C, Ostendorf T, Lue H, Bernhagen J (2012) Role for CD74 and CXCR4 in clathrin-dependent endocytosis of the cytokine MIF. Eur J Cell Biol 91(6–7):435–449
Shao DW, Yang CY, Liu B, Chen W, Wang H, Ru HX, Zhang M, Wang Y (2015) Bioinformatics analysis of potential candidates for therapy of TDRD7 deficiency-induced congenital cataract. Ophthalmic Res 54(1):10–17
Shao M, Li D, Teng J, Zhang Y, Li S, Cao W (2017) Association between serum complement C3 levels and age-related cataract. Invest Ophthalmol vis Sci 58(11):4934–4939
Shi J, Wang Q, Shi Y (2003) Effect of acupuncture on the changes of lon contents of aqueous humor and the immune system in senile cataract patients. Acupunct Res 01:62–65 ((In Chinese))
Shiels A, Hejtmancik JF (2007) Genetic origins of cataract. Arch Ophthalmol 125(2):165–173
Stasi K, Nagel D, Yang X, Wang RF, Ren L, Podos SM, Mittag T, Danias J (2006) Complement component 1Q (C1Q) upregulation in retina of murine, primate, and human glaucomatous eyes. Invest Ophthalmol vis Sci 47(3):1024–1029
Stevens B, Allen NJ, Vazquez LE, Howell GR, Christopherson KS, Nouri N, Micheva KD, Mehalow AK, Huberman AD, Stafford B, Sher A, Litke AM, Lambris JD, Smith SJ, John SW, Barres BA (2007) The classical complement cascade mediates CNS synapse elimination. Cell 131(6):1164–1178
Tam OH, Pennisi D, Wilkinson L, Little MH, Wazin F, Wan VL, Lovicu FJ (2018) Crim1 is required for maintenance of the ocular lens epithelium. Exp Eye Res 170:58–66
Town T, Laouar Y, Pittenger C, Mori T, Szekely CA, Tan J, Duman RS, Flavell RA (2008) Blocking TGF-beta-Smad2/3 innate immune signaling mitigates Alzheimer-like pathology. Nat Med 14(6):681–687
Vandenbark AA, Meza-Romero R, Benedek G, Andrew S, Huan J, Chou YK, Buenafe AC, Dahan R, Reiter Y, Mooney JL, Offner H, Burrows GG (2013) A novel regulatory pathway for autoimmune disease: binding of partial MHC class II constructs to monocytes reduces CD74 expression and induces both specific and bystander T-cell tolerance. J Autoimmun 40:96–110
Wang J, Lin J, Schlotterer A, Wu L, Fleming T, Busch S, Dietrich N, Hammes HP (2014) CD74 indicates microglial activation in experimental diabetic retinopathy and exogenous methylglyoxal mimics the response in normoglycemic retina. Acta Diabetol 51(5):813–821
Wang D, Yang H, Yi J (2016) Research progress of lens protein genes associated with congenital cataract. Chin J Ophthalmol 52(02):141–149 ((In Chinese))
Wang J, Ye Q, Xu J, Benedek G, Zhang H, Yang Y, Liu H, Meza-Romero R, Vandenbark AA, Offner H, Gao Y (2017) DRα1-MOG-35-55 reduces permanent ischemic brain injury. Transl Stroke Res 8(3):284–293
Wen Y, Li GW, Bekhor I (1996) Lens epithelial cell mRNA. III. Elevated expression of macrophage migration inhibitory factor mRNA in galactose cataracts. Curr Eye Res 15(2):125–130
Zhang Y, Fan J, Ho JW, Hu T, Kneeland SC, Fan X, Xi Q, Sellarole MA, de Vries WN, Lu W, Lachke SA, Lang RA, John SW, Maas RL (2016) Crim1 regulates integrin signaling in murine lens development. Development 143(2):356–366
Zhou Z, Li L, Lu L, Min L (2018) Identification of a missense mutation in MIP gene via mutation analysis of a Guangxi Zhuang ethnic pedigree with congenital nuclear cataracts. Exp Ther Med 16(4):3256–3260
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by JZ, FM and ZZ. The first draft of the manuscript was written by ZZ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. ZZ, FM and JZ contributed equally to this work.
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Zhang, Z., Meng, F., Zhou, J. et al. Integrative Bioinformatics Analysis of mRNA Expression Profiles of Mice to Explore the Key Genes Involved in Crim1 Mutation-Induced Congenital Cataracts. Biochem Genet 61, 1334–1350 (2023). https://doi.org/10.1007/s10528-022-10323-3
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DOI: https://doi.org/10.1007/s10528-022-10323-3