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Bonasoni MP, Comitini G, Pati M, Bizzarri V, Barbieri V, Marinelli M, Caraffi SG, Zuntini R, Pollazzon M, Palicelli A, Garavelli L. Prenatal Array-CGH Detection of 3q26.32q26.33 Interstitial Deletion Encompassing the SOX2 Gene: Ultrasound, Pathological, and Cytogenetic Findings. Fetal Pediatr Pathol 2023; 42:979-989. [PMID: 37747279 DOI: 10.1080/15513815.2023.2261043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 09/14/2023] [Indexed: 09/26/2023]
Abstract
Background: SOX2 disorders are associated with anophthalmia-esophageal-genital syndrome or microphthalmia, syndromic 3 (MCOPS3- # 206900). Case Report: We describe a third fetal case with a de novo 3q26.32q26.33 deletion extending for 4.31 Mb, detected in a 15-week fetus. After legal interruption of pregnancy, at autopsy, the fetus presented bilateral microphthalmia, right cleft lip and palate, bilateral cerebral ventriculomegaly and dilated third ventricle, microcystic left lung, and intestinal malrotation. Histologically, the left lung showed congenital pulmonary airway malformation (CPAM) type 2. Retinal dysplasia was found in both eyes. Discussion/Conclusion: The human SOX2 gene (OMIM #184429) is located on chromosome 3 at position q26.3-27 and encodes a transcription factor involved in the development of the central and peripheral nervous systems, retina, and lung. In our case, the combination of cerebral, retinal, and pulmonary anomalies, not previously described, are consistent with SOX2 haploinsufficiency due to chromosomal deletion.
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Affiliation(s)
| | - Giuseppina Comitini
- Department of Obstetrics & Gynaecology, Azienda Unità Sanitaria Locale-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Mariangela Pati
- Department of Obstetrics & Gynaecology, Azienda Unità Sanitaria Locale-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Veronica Bizzarri
- Medical Genetics Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Veronica Barbieri
- Medical Genetics Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Maria Marinelli
- Medical Genetics Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | | | - Roberta Zuntini
- Medical Genetics Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Marzia Pollazzon
- Medical Genetics Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Andrea Palicelli
- Pathology Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Livia Garavelli
- Medical Genetics Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
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Su D, Eliason S, Sun Z, Shao F, Amendt BA. Wolf-Hirschhorn syndrome candidate 1 (Whsc1) methyltransferase signals via a Pitx2-miR-23/24 axis to effect tooth development. J Biol Chem 2023; 299:105324. [PMID: 37806494 PMCID: PMC10656234 DOI: 10.1016/j.jbc.2023.105324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 09/01/2023] [Accepted: 09/22/2023] [Indexed: 10/10/2023] Open
Abstract
Wolf-Hirschhorn syndrome (WHS) is a developmental disorder attributed to a partial deletion on the short arm of chromosome 4. WHS patients suffer from oral manifestations including cleft lip and palate, hypodontia, and taurodontism. WHS candidate 1 (WHSC1) gene is a H3K36-specific methyltransferase that is deleted in every reported case of WHS. Mutation in this gene also results in tooth anomalies in patients. However, the correlation between genetic abnormalities and the tooth anomalies has remained controversial. In our study, we aimed to clarify the role of WHSC1 in tooth development. We profiled the Whsc1 expression pattern during mouse incisor and molar development by immunofluorescence staining and found Whsc1 expression is reduced as tooth development proceeds. Using real-time quantitative reverse transcription PCR, Western blot, chromatin immunoprecipitation, and luciferase assays, we determined that Whsc1 and Pitx2, the initial transcription factor involved in tooth development, positively and reciprocally regulate each other through their gene promoters. miRNAs are known to regulate gene expression posttranscriptionally during development. We previously reported miR-23a/b and miR-24-1/2 were highly expressed in the mature tooth germ. Interestingly, we demonstrate here that these two miRs directly target Whsc1 and repress its expression. Additionally, this miR cluster is also negatively regulated by Pitx2. We show the expression of these two miRs and Whsc1 are inversely correlated during mouse mandibular development. Taken together, our results provide new insights into the potential role of Whsc1 in regulating tooth development and a possible molecular mechanism underlying the dental defects in WHS.
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Affiliation(s)
- Dan Su
- Department of Anatomy and Cell Biology, The University of Iowa, Iowa City, Iowa, USA; Craniofacial Anomalies Research Center, Carver College of Medicine, The University of Iowa, Iowa City, Iowa, USA
| | - Steve Eliason
- Department of Anatomy and Cell Biology, The University of Iowa, Iowa City, Iowa, USA; Craniofacial Anomalies Research Center, Carver College of Medicine, The University of Iowa, Iowa City, Iowa, USA
| | - Zhao Sun
- College of Medicine, Washington University St Louis, St Louis, Missouri, USA
| | - Fan Shao
- Department of Anatomy and Cell Biology, The University of Iowa, Iowa City, Iowa, USA
| | - Brad A Amendt
- Department of Anatomy and Cell Biology, The University of Iowa, Iowa City, Iowa, USA; Craniofacial Anomalies Research Center, Carver College of Medicine, The University of Iowa, Iowa City, Iowa, USA; Iowa Institute for Oral Health Research, College of Dentistry, The University of Iowa, Iowa City, Iowa, USA.
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Feitosa ALF, da Silva GRN, Moya MP, Martinelli RLDC, da Silva MGP. Ankyloglossia in Monochorionic Diamniotic and Dichorionic Diamniotic Twins: A Cross-Sectional Study. Breastfeed Med 2023; 18:528-533. [PMID: 37428528 DOI: 10.1089/bfm.2022.0239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Objective: To determine the prevalence of ankyloglossia in diamniotic monochorionic and diamniotic dichorionic twins, as well as to verify the relationship between gender and type of pregnancy. Study Design: A cross-sectional observational study, carried out with 52 pairs of dichorionic/diamniotic twins and 49 monochorionic/diamniotic pairs. The data collection was carried out through the analysis of medical records and the results of the Neonatal Screening of the Tongue Frenulum Assessment Protocol in Babies, and corresponded to the period of 2 years (2020-2022). Statistical analysis of data was performed, considering the significance value of 5%. The study was approved by the Human Research Ethics Committee of the institution. Results: The statistical analysis of multiple logistic regression between the two groups of twins (Mono/Di and Di/Di) according to the socioeconomic, demographic, and clinical-epidemiological profile was statistically significant for some variables. The prevalence of ankyloglossia, according to the type of twin pregnancy, showed a statistically significant difference. There was no statistical difference in relation to sex and ankyloglossia, or between couples diagnosed with ankyloglossia according to the type of pregnancy. Conclusion: Monochorionic/diamniotic twins had a higher prevalence of ankyloglossia, regardless of gender.
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Affiliation(s)
| | | | - María Paz Moya
- Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Temuco, Chile
| | | | - Maria Gabriella Pacheco da Silva
- Neonatology Service, Centro Universitário Integrado de Saúde Amaury de Medeiros (CISAM), Recife, Brazil
- Universidade de Pernambuco (UPE), Recife, Brazil
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Xiao Y, Jiao S, He M, Lin D, Zuo H, Han J, Sun Y, Cao G, Chen Z, Liu H. Chromatin conformation of human oral epithelium can identify orofacial cleft missing functional variants. Int J Oral Sci 2022; 14:43. [PMID: 36008388 PMCID: PMC9411193 DOI: 10.1038/s41368-022-00194-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 07/19/2022] [Accepted: 07/29/2022] [Indexed: 11/09/2022] Open
Abstract
Genome-wide association studies (GWASs) are the most widely used method to identify genetic risk loci associated with orofacial clefts (OFC). However, despite the increasing size of cohort, GWASs are still insufficient to detect all the heritability, suggesting there are more associations under the current stringent statistical threshold. In this study, we obtained an integrated epigenomic dataset based on the chromatin conformation of a human oral epithelial cell line (HIOEC) using RNA-seq, ATAC-seq, H3K27ac ChIP-seq, and DLO Hi-C. Presumably, this epigenomic dataset could reveal the missing functional variants located in the oral epithelial cell active enhancers/promoters along with their risk target genes, despite relatively less-stringent statistical association with OFC. Taken a non-syndromic cleft palate only (NSCPO) GWAS data of the Chinese Han population as an example, 3664 SNPs that cannot reach the strict significance threshold were subjected to this functional identification pipeline. In total, 254 potential risk SNPs residing in active cis-regulatory elements interacting with 1 718 promoters of oral epithelium-expressed genes were screened. Gapped k-mer machine learning based on enhancers interacting with epithelium-expressed genes along with in vivo and in vitro reporter assays were employed as functional validation. Among all the potential SNPs, we chose and confirmed that the risk alleles of rs560789 and rs174570 reduced the epithelial-specific enhancer activity by preventing the binding of transcription factors related to epithelial development. In summary, we established chromatin conformation datasets of human oral epithelial cells and provided a framework for testing and understanding how regulatory variants impart risk for clefts.
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Affiliation(s)
- Yao Xiao
- The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, 237 Luoyu Road, Wuhan, China.,Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Shengbo Jiao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Hubei Hongshan Laboratory, Institute of Hydrobiology, Innovation Academy for Seed Design, Chinese Academy of Sciences, Wuhan, China.,College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Miao He
- The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, 237 Luoyu Road, Wuhan, China
| | - Da Lin
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
| | - Huanyan Zuo
- The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, 237 Luoyu Road, Wuhan, China
| | - Jiahao Han
- The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, 237 Luoyu Road, Wuhan, China
| | - Yonghua Sun
- State Key Laboratory of Freshwater Ecology and Biotechnology, Hubei Hongshan Laboratory, Institute of Hydrobiology, Innovation Academy for Seed Design, Chinese Academy of Sciences, Wuhan, China.,College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Gang Cao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
| | - Zhi Chen
- The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, 237 Luoyu Road, Wuhan, China.
| | - Huan Liu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, 237 Luoyu Road, Wuhan, China. .,Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, China.
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5
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Eliason S, Su D, Pinho F, Sun Z, Zhang Z, Li X, Sweat M, Venugopalan SR, He B, Bustin M, Amendt BA. HMGN2 represses gene transcription via interaction with transcription factors Lef-1 and Pitx2 during amelogenesis. J Biol Chem 2022; 298:102295. [PMID: 35872015 PMCID: PMC9418915 DOI: 10.1016/j.jbc.2022.102295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 07/06/2022] [Accepted: 07/11/2022] [Indexed: 11/06/2022] Open
Abstract
The chromatin-associated high mobility group protein N2 (HMGN2) cofactor regulates transcription factor activity through both chromatin and protein interactions. Hmgn2 expression is known to be developmentally regulated, but the post-transcriptional mechanisms that regulate Hmgn2 expression and its precise roles in tooth development remain unclear. Here, we demonstrate that HMGN2 inhibits the activity of multiple transcription factors as a general mechanism to regulate early development. Bimolecular fluorescence complementation, pull-down, and coimmunoprecipitation assays show that HMGN2 interacts with the transcription factor Lef-1 through its HMG-box domain as well as with other early development transcription factors, Dlx2, FoxJ1, and Pitx2. Furthermore, EMSAs demonstrate that HMGN2 binding to Lef-1 inhibits its DNA-binding activity. We found that Pitx2 and Hmgn2 associate with H4K5ac and H3K4me2 chromatin marks in the proximal Dlx2 promoter, demonstrating Hmgn2 association with open chromatin. In addition, we demonstrate that microRNAs (miRs) mir-23a and miR-23b directly target Hmgn2, promoting transcriptional activation at several gene promoters, including the amelogenin promoter. In vivo, we found that decreased Hmgn2 expression correlates with increased miR-23 expression in craniofacial tissues as the murine embryo develops. Finally, we show that ablation of Hmgn2 in mice results in increased amelogenin expression because of increased Pitx2, Dlx2, Lef-1, and FoxJ1 transcriptional activity. Taken together, our results demonstrate both post-transcriptional regulation of Hmgn2 by miR-23a/b and post-translational regulation of gene expression by Hmgn2–transcription factor interactions. We conclude that HMGN2 regulates tooth development through its interaction with multiple transcription factors.
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Affiliation(s)
- Steven Eliason
- Department of Anatomy and Cell Biology, and the Craniofacial Anomalies Research Center, The University of Iowa, Iowa City, IA
| | - Dan Su
- Department of Anatomy and Cell Biology, and the Craniofacial Anomalies Research Center, The University of Iowa, Iowa City, IA
| | | | - Zhao Sun
- Washington University St. Louis, St. Louis, MO
| | | | - Xiao Li
- Texas Heart Institute, Houston, TX
| | | | | | - Bing He
- Protein Section, Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Michael Bustin
- Protein Section, Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Brad A Amendt
- Department of Anatomy and Cell Biology, and the Craniofacial Anomalies Research Center, The University of Iowa, Iowa City, IA; Department of Orthodontics, The University of Iowa, Iowa City, IA.
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