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TBX6-associated congenital scoliosis (TACS) as a clinically distinguishable subtype of congenital scoliosis: further evidence supporting the compound inheritance and TBX6 gene dosage model

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机构: [a]Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China [b]Beijing Key Laboratory for Genetic Research of Skeletal Deformity, Beijing, China [c]Department of Breast Surgical Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China [d]Medical Research Center of Orthopedics, Chinese Academy of Medical Sciences, Beijing, China [e]Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, United States [f]Obstetrics and Gynecology Hospital, State Key Laboratory of Genetic Engineering at School of Life Sciences, Institute of Metabolism and Integrative Biology, Fudan University, Shanghai, China [g]NHC Key Laboratory of Reproduction Regulation, Shanghai Institute of Planned Parenthood Research, Fudan University, Shanghai, China [h]Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, China [i]Laboratory of Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan [j]Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan [k]Graduate School of Peking Union Medical College, Beijing, China [l]Department of Internal Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China [m]Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China [n]Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, United States [o]The McKusick–Zhang Center for Genetic Medicine, Institute of Basic Medical Sciences, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China [p]The State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China [q]Department of Central Laboratory, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China [r]Department of Medical Genetics, Capital Institute of Pediatrics, Beijing, China [s]College of Biomedical Engineering, The Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China [t]PET-CT Center, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China [u]Department of Radiology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China [v]Department of Orthopedic Surgery, Hospital for Special Surgery, New York, NY, United States [w]Department of Cardiology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China [x]Division of Genetics and Genomics, Boston Children’s Hospital, Boston, MA, United States [y]Harvard Medical School, Boston, MA, United States [z]McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States [aa]Department of Pediatrics, Drexel University College of Medicine, Philadelphia, PA, United States [ab]Baylor Genetics Laboratory, Houston, TX, United States [ac]Departments of Pediatrics, Baylor College of Medicine, Houston, TX, United States [ad]Texas Children’s Hospital, Houston, TX, United States
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关键词: 16p11 2/TBX6 compound inheritance model congenital scoliosis (CS) gene dosage genotype-phenotype correlation

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Purpose: To characterize clinically measurable endophenotypes, implicating the TBX6 compound inheritance model. Methods: Patients with congenital scoliosis (CS) from China(N = 345, cohort 1), Japan (N = 142, cohort 2), and the United States (N = 10, cohort 3) were studied. Clinically measurable endophenotypes were compared according to the TBX6 genotypes. A mouse model for Tbx6 compound inheritance (N = 52) was investigated by micro computed tomography (micro-CT). A clinical diagnostic algorithm (TACScore) was developed to assist in clinical recognition of TBX6-associated CS (TACS). Results: In cohort 1, TACS patients (N = 33) were significantly younger at onset than the remaining CS patients (P = 0.02), presented with one or more hemivertebrae/butterfly vertebrae (P = 4.9 × 10 ‒8 ), and exhibited vertebral malformations involving the lower part of the spine (T8–S5, P = 4.4 × 10 ‒3 ); observations were confirmed in two replication cohorts. Simple rib anomalies were prevalent in TACS patients (P = 3.1 × 10 ‒7 ), while intraspinal anomalies were uncommon (P = 7.0 × 10 ‒7 ). A clinically usable TACScore was developed with an area under the curve (AUC) of 0.9 (P = 1.6 × 10 ‒15 ). A Tbx6 -/mh (mild-hypomorphic) mouse model supported that a gene dosage effect underlies the TACS phenotype. Conclusion: TACS is a clinically distinguishable entity with consistent clinically measurable endophenotypes. The type and distribution of vertebral column abnormalities in TBX6/Tbx6 compound inheritance implicate subtle perturbations in gene dosage as a cause of spine developmental birth defects responsible for about 10% of CS. © 2019, American College of Medical Genetics and Genomics.

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大类 | 1 区 医学
小类 | 1 区 遗传学
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大类 | 1 区 医学
小类 | 1 区 遗传学
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Q1 GENETICS & HEREDITY
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Q1 GENETICS & HEREDITY

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第一作者机构: [a]Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
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