ABCC2基因及其编码的多药耐药相关蛋白2(multidrug resistance-associated protein 2,MRP2)是一种跨膜转运蛋白,主要表达于肝脏上皮细胞,是维持肝脏正常功能的关键物质,负责胆红素、药物及其代谢产物的跨膜转运,在物质转运及信号传导过...ABCC2基因及其编码的多药耐药相关蛋白2(multidrug resistance-associated protein 2,MRP2)是一种跨膜转运蛋白,主要表达于肝脏上皮细胞,是维持肝脏正常功能的关键物质,负责胆红素、药物及其代谢产物的跨膜转运,在物质转运及信号传导过程中发挥重要作用。ABCC2基因若发生致病性突变或其表达调控出现异常时,会导致蛋白功能缺陷,进而引发遗传性高结合胆红素血症,且与非酒精性脂肪性肝病、妊娠期胆汁淤积、药物性肝损伤等疾病密切相关,部分患者还可能出现腹痛等肝外器官相关症状。本文系统阐述了ABCC2基因突变的分子遗传特征、致病机制及其与相关肝脏疾病的研究进展,旨在为这类疾病的临床精准诊疗和深入基础研究提供理论依据。展开更多
背景青少年起病的成人型糖尿病(maturity-onset diabetes of the young,MODY)是一类单基因糖尿病(diabetes mellitus,DM),MODY12是其罕见亚型,目前国内报道较少。目的探讨MODY12亚型的临床特点、遗传学检测及治疗经验,以提高对该病的认...背景青少年起病的成人型糖尿病(maturity-onset diabetes of the young,MODY)是一类单基因糖尿病(diabetes mellitus,DM),MODY12是其罕见亚型,目前国内报道较少。目的探讨MODY12亚型的临床特点、遗传学检测及治疗经验,以提高对该病的认识及诊治水平。方法回顾性分析一例ATP结合盒转运子亚家族C成员8(ATP-binding cassette subfamily C member 8,ABCC8)基因突变所致MODY12亚型患者的临床资料并结合文献进行总结。结果患者为32岁女性,BMI 22.06 kg/m2,因胰腺炎住院,检查发现空腹血糖11.99 mmol/L,随机血糖21.07 mmol/L,糖化血红蛋白(glycosylated hemoglobin,HbA1c)9.3%,空腹胰岛素15.112μU/mL,餐后峰值胰岛素55.747μU/mL,空腹C肽0.49 ng/mL,餐后峰值C肽3.04 ng/mL,糖尿病自身抗体均阴性,疑诊特殊类型糖尿病。通过对患者家系基因组DNA进行全外显子组捕获和测序,并使用Sanger测序法验证其亲属信息,发现患者及其父亲携带ABCC8(NM_000352.6)c.824G>A(p.Arg275Gln)杂合突变,多个生物信息学软件预测均提示该变异为有害突变。患者原以基础胰岛素联合米格列醇治疗,基因诊断明确后改用小剂量磺脲类药物(格列美脲1 mg/d)降糖,随访血糖控制理想。结论对于中青年起病的糖尿病患者,如糖尿病自身抗体阴性、胰岛功能尚可、胰岛素抵抗不明显,要注意MODY的可能,基因检测有助于明确诊断。对于确诊为MODY12的患者,改用小剂量磺脲类药物治疗可以取得良好血糖控制效果且可避免不必要的长期胰岛素注射治疗。展开更多
BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 gene.It is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiop...BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 gene.It is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiopathic jaundice as the main clinical manifestation.Genetic alterations of the ABCC2 gene are commonly used for diagnosing DJS;however,the causative ABCC2 point mutation in Chinese patients remains unknown.Research on ABCC2 mutations in Chinese DJS patients is extremely rare,and the diagnosis of DJS remains limited.The routine analysis of ABCC2 mutations is helpful for the diagnosis of DJS.Here,we report the clinical characteristics and ABCC2 genotype of an adult female DJS patient.This article is to expound the discovery of more potentially pathogenic ABCC2 variants will that contribute to DJS identification.CASE SUMMARY This study investigated a woman referred for DJS and involved clinical and genetic analyses.ABCC2 mutations were identified by next-generation sequencing(NGS).The patient showed intermittent jaundice and conjugated hyperbilirubinemia.Histopathological examinations were consistent with the typical phenotype of DJS.Genetic diagnostic analysis revealed an ABCC2 genotype exhibiting a pathogenic variant,namely c.2443C>T(p.Arg815*),which has not been reported previously in the domestic or foreign literature.CONCLUSION Pathogenic ABCC2 mutations play an important role in the diagnosis of DJS,especially in patients with atypical presentations.Currently,NGS is used in the routine analysis of DJS cases and such tests of further cases will better illuminate the relationship between various genotypes and phenotypes of DJS.展开更多
ATP-binding cassette transporter C2(ABCC2)is known to be a receptor for Bacillus thuringiensis(Bt)toxins in several lepidopteran insects.Mutations in the ABCC2 gene have been genetically linked to field-evolved resist...ATP-binding cassette transporter C2(ABCC2)is known to be a receptor for Bacillus thuringiensis(Bt)toxins in several lepidopteran insects.Mutations in the ABCC2 gene have been genetically linked to field-evolved resistance to the Cry1 F toxin from Bt in Spodoptera frugiperda.Here we generated a SfABCC2 knockout strain of S.frugiperda using the CRISPR/Cas9 system to provide further functional evidence of the role of this gene in susceptibility and resistance to Cry1 F.Results from bioassays showed that the SfABCC2 knockout S.frugiperda strain displayed 118-fold resistance to Cry1 F compared with the parental DH19 strain,but no resistance to Vip3 A toxin from Bt.These results provide the first reverse genetic evidence for SfABCC2 as a functional receptor for Cry1 F.展开更多
摘要ABCC2基因及其编码的多药耐药相关蛋白2(multidrug resistance-associated protein 2,MRP2)是一种跨膜转运蛋白,主要表达于肝脏上皮细胞,是维持肝脏正常功能的关键物质,负责胆红素、药物及其代谢产物的跨膜转运,在物质转运及信号传导过程中发挥重要作用。ABCC2基因若发生致病性突变或其表达调控出现异常时,会导致蛋白功能缺陷,进而引发遗传性高结合胆红素血症,且与非酒精性脂肪性肝病、妊娠期胆汁淤积、药物性肝损伤等疾病密切相关,部分患者还可能出现腹痛等肝外器官相关症状。本文系统阐述了ABCC2基因突变的分子遗传特征、致病机制及其与相关肝脏疾病的研究进展,旨在为这类疾病的临床精准诊疗和深入基础研究提供理论依据。
摘要背景青少年起病的成人型糖尿病(maturity-onset diabetes of the young,MODY)是一类单基因糖尿病(diabetes mellitus,DM),MODY12是其罕见亚型,目前国内报道较少。目的探讨MODY12亚型的临床特点、遗传学检测及治疗经验,以提高对该病的认识及诊治水平。方法回顾性分析一例ATP结合盒转运子亚家族C成员8(ATP-binding cassette subfamily C member 8,ABCC8)基因突变所致MODY12亚型患者的临床资料并结合文献进行总结。结果患者为32岁女性,BMI 22.06 kg/m2,因胰腺炎住院,检查发现空腹血糖11.99 mmol/L,随机血糖21.07 mmol/L,糖化血红蛋白(glycosylated hemoglobin,HbA1c)9.3%,空腹胰岛素15.112μU/mL,餐后峰值胰岛素55.747μU/mL,空腹C肽0.49 ng/mL,餐后峰值C肽3.04 ng/mL,糖尿病自身抗体均阴性,疑诊特殊类型糖尿病。通过对患者家系基因组DNA进行全外显子组捕获和测序,并使用Sanger测序法验证其亲属信息,发现患者及其父亲携带ABCC8(NM_000352.6)c.824G>A(p.Arg275Gln)杂合突变,多个生物信息学软件预测均提示该变异为有害突变。患者原以基础胰岛素联合米格列醇治疗,基因诊断明确后改用小剂量磺脲类药物(格列美脲1 mg/d)降糖,随访血糖控制理想。结论对于中青年起病的糖尿病患者,如糖尿病自身抗体阴性、胰岛功能尚可、胰岛素抵抗不明显,要注意MODY的可能,基因检测有助于明确诊断。对于确诊为MODY12的患者,改用小剂量磺脲类药物治疗可以取得良好血糖控制效果且可避免不必要的长期胰岛素注射治疗。
基金Supported by The Talents of Qiankehe platform of China,No.[2018]5779-40the Zhuke Contract,No.[2018]1-92and the Qiankehe Support,No.[2017]2874.
摘要BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 gene.It is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiopathic jaundice as the main clinical manifestation.Genetic alterations of the ABCC2 gene are commonly used for diagnosing DJS;however,the causative ABCC2 point mutation in Chinese patients remains unknown.Research on ABCC2 mutations in Chinese DJS patients is extremely rare,and the diagnosis of DJS remains limited.The routine analysis of ABCC2 mutations is helpful for the diagnosis of DJS.Here,we report the clinical characteristics and ABCC2 genotype of an adult female DJS patient.This article is to expound the discovery of more potentially pathogenic ABCC2 variants will that contribute to DJS identification.CASE SUMMARY This study investigated a woman referred for DJS and involved clinical and genetic analyses.ABCC2 mutations were identified by next-generation sequencing(NGS).The patient showed intermittent jaundice and conjugated hyperbilirubinemia.Histopathological examinations were consistent with the typical phenotype of DJS.Genetic diagnostic analysis revealed an ABCC2 genotype exhibiting a pathogenic variant,namely c.2443C>T(p.Arg815*),which has not been reported previously in the domestic or foreign literature.CONCLUSION Pathogenic ABCC2 mutations play an important role in the diagnosis of DJS,especially in patients with atypical presentations.Currently,NGS is used in the routine analysis of DJS cases and such tests of further cases will better illuminate the relationship between various genotypes and phenotypes of DJS.
基金supported by the Key Project for Breeding Genetic Modified Organisms of China(2016ZX08012004003)。
摘要ATP-binding cassette transporter C2(ABCC2)is known to be a receptor for Bacillus thuringiensis(Bt)toxins in several lepidopteran insects.Mutations in the ABCC2 gene have been genetically linked to field-evolved resistance to the Cry1 F toxin from Bt in Spodoptera frugiperda.Here we generated a SfABCC2 knockout strain of S.frugiperda using the CRISPR/Cas9 system to provide further functional evidence of the role of this gene in susceptibility and resistance to Cry1 F.Results from bioassays showed that the SfABCC2 knockout S.frugiperda strain displayed 118-fold resistance to Cry1 F compared with the parental DH19 strain,but no resistance to Vip3 A toxin from Bt.These results provide the first reverse genetic evidence for SfABCC2 as a functional receptor for Cry1 F.