强直性肌营养不良1型(myotonic dystrophy type 1,DM1)为罕见的常染色体显性遗传性疾病。中南大学湘雅三医院内分泌科收治1例以早发糖尿病和肌力下降为表现的DM1患者。采集患者外周血提取DNA进行基因检测,发现患者强直性肌营养不良蛋白...强直性肌营养不良1型(myotonic dystrophy type 1,DM1)为罕见的常染色体显性遗传性疾病。中南大学湘雅三医院内分泌科收治1例以早发糖尿病和肌力下降为表现的DM1患者。采集患者外周血提取DNA进行基因检测,发现患者强直性肌营养不良蛋白激酶(dystrophia myotonica protein kinase,DMPK)基因的3'-非翻译区(3'-untranslated region,3'-UTR)的三核苷酸CTG重复大于100次,DM1诊断明确。对于合并肌肉症状等多系统异常的糖尿病患者,应当注意DM1这一罕见疾病的筛查。展开更多
强直性肌营养不良1型(myotonic dystrophy type 1,DM1)是一种罕见的常染色体显性遗传病,可累及肌肉、心脏、晶状体、内分泌腺、中枢神经系统等。临床分为先天型DM1、儿童型DM1、经典成人型DM1、轻症晚发型DM1共4型。先天型DM1症状重、...强直性肌营养不良1型(myotonic dystrophy type 1,DM1)是一种罕见的常染色体显性遗传病,可累及肌肉、心脏、晶状体、内分泌腺、中枢神经系统等。临床分为先天型DM1、儿童型DM1、经典成人型DM1、轻症晚发型DM1共4型。先天型DM1症状重、病死率高,目前国内仅查到1篇文献报道,且患儿于生后28 d内死亡。本文报告1例目前生长发育良好的先天型DM1患儿的临床特征、DMPK基因检测结果、治疗及随访情况。展开更多
Mutations of lamin A/C (LMNA) cause a wide range of human disorders, including progeria, lipodystrophy, neuropathies and autosomal dominant Emery-Dreifuss muscular dystrophy (EDMD). EDMD is also caused by X-linked rec...Mutations of lamin A/C (LMNA) cause a wide range of human disorders, including progeria, lipodystrophy, neuropathies and autosomal dominant Emery-Dreifuss muscular dystrophy (EDMD). EDMD is also caused by X-linked recessive loss-of-function mutations of emerin, another component of the inner nuclear lamina that directly interacts with LMNA. One model for disease pathogenesis of LMNA and emerin mutations is cellspecific perturbations of the mRNA transcriptome in terminally differentiated cells. To test this model, we studied 125 human muscle biopsies from 13 diagnostic groups (125 U133A, 125 U133B microarrays), including EDMD patients with LMNA and emerin mutations. A Visual and Statistical Data Analyzer (VISDA) algorithm was used to statistically model cluster hierarchy, resulting in a tree of phenotypic classifications. Validations of the diagnostic tree included permutations of U133A and U133B arrays, and use of two probe set algorithms (MAS5.0 and MBE1). This showed that the two nuclear envelope defects (EDMD LMNA, EDMD emerin) were highly related disorders and were also related to fascioscapulohumeral muscular dystrophy (FSHD). FSHD has recently been hypothesized to involve abnormal interactions of chromatin with the nuclear envelope. To identify disease-specific transcripts for EDMD, we applied a leave-one-out (LOO) cross-validation approach using LMNA patient muscle as a test data set, with reverse transcription-polymerase chain reaction (RT-PCR) validations in both LMNA and emerin patient muscle. A high proportion of top-ranked and validated transcripts were components of the same transcriptional regulatory pathway involving Rb1 and MyoD during muscle regeneration (CRI-1, CREBBP, NapIL1, ECREBBP/p300), where each was specifically upregulated in EDMD. Using a muscle regeneration time series (27 time points) we develop a transcriptional model for downstream consequences of LMNA and emerin mutations. We propose that key interactions between the nuclear envelope and Rb and MyoD fail in EDMD at the point of myoblast exit from the cell cycle, leading to poorly coordinated phosphorylation and acetylation steps. Our data is consistent with mutations of nuclear lamina components leading to destabilization of the transcriptome in differentiated cells.展开更多
文摘强直性肌营养不良1型(myotonic dystrophy type 1,DM1)为罕见的常染色体显性遗传性疾病。中南大学湘雅三医院内分泌科收治1例以早发糖尿病和肌力下降为表现的DM1患者。采集患者外周血提取DNA进行基因检测,发现患者强直性肌营养不良蛋白激酶(dystrophia myotonica protein kinase,DMPK)基因的3'-非翻译区(3'-untranslated region,3'-UTR)的三核苷酸CTG重复大于100次,DM1诊断明确。对于合并肌肉症状等多系统异常的糖尿病患者,应当注意DM1这一罕见疾病的筛查。
文摘强直性肌营养不良1型(myotonic dystrophy type 1,DM1)是一种罕见的常染色体显性遗传病,可累及肌肉、心脏、晶状体、内分泌腺、中枢神经系统等。临床分为先天型DM1、儿童型DM1、经典成人型DM1、轻症晚发型DM1共4型。先天型DM1症状重、病死率高,目前国内仅查到1篇文献报道,且患儿于生后28 d内死亡。本文报告1例目前生长发育良好的先天型DM1患儿的临床特征、DMPK基因检测结果、治疗及随访情况。
文摘Mutations of lamin A/C (LMNA) cause a wide range of human disorders, including progeria, lipodystrophy, neuropathies and autosomal dominant Emery-Dreifuss muscular dystrophy (EDMD). EDMD is also caused by X-linked recessive loss-of-function mutations of emerin, another component of the inner nuclear lamina that directly interacts with LMNA. One model for disease pathogenesis of LMNA and emerin mutations is cellspecific perturbations of the mRNA transcriptome in terminally differentiated cells. To test this model, we studied 125 human muscle biopsies from 13 diagnostic groups (125 U133A, 125 U133B microarrays), including EDMD patients with LMNA and emerin mutations. A Visual and Statistical Data Analyzer (VISDA) algorithm was used to statistically model cluster hierarchy, resulting in a tree of phenotypic classifications. Validations of the diagnostic tree included permutations of U133A and U133B arrays, and use of two probe set algorithms (MAS5.0 and MBE1). This showed that the two nuclear envelope defects (EDMD LMNA, EDMD emerin) were highly related disorders and were also related to fascioscapulohumeral muscular dystrophy (FSHD). FSHD has recently been hypothesized to involve abnormal interactions of chromatin with the nuclear envelope. To identify disease-specific transcripts for EDMD, we applied a leave-one-out (LOO) cross-validation approach using LMNA patient muscle as a test data set, with reverse transcription-polymerase chain reaction (RT-PCR) validations in both LMNA and emerin patient muscle. A high proportion of top-ranked and validated transcripts were components of the same transcriptional regulatory pathway involving Rb1 and MyoD during muscle regeneration (CRI-1, CREBBP, NapIL1, ECREBBP/p300), where each was specifically upregulated in EDMD. Using a muscle regeneration time series (27 time points) we develop a transcriptional model for downstream consequences of LMNA and emerin mutations. We propose that key interactions between the nuclear envelope and Rb and MyoD fail in EDMD at the point of myoblast exit from the cell cycle, leading to poorly coordinated phosphorylation and acetylation steps. Our data is consistent with mutations of nuclear lamina components leading to destabilization of the transcriptome in differentiated cells.
