Background The fat deposition has a crucial role in animal meat flavor,and fat deposition-related traits are vital for breeding in the commercial duck industry.Avian fat-related traits are typical complex phenotypes,w...Background The fat deposition has a crucial role in animal meat flavor,and fat deposition-related traits are vital for breeding in the commercial duck industry.Avian fat-related traits are typical complex phenotypes,which need a large amount of data to analyze the genetic loci.Results In this study,we performed a new phenotypic analysis of fat traits and genotyped whole-genome varia-tions for 1,246 ducks,and combed with previous GWAS data to reach 1,880 ducks for following analysis.The carcass composition traits,subcutaneous fat weight(SFW),subcutaneous fat percentage(SFP),abdominal fat weight(AFW),abdominal fat percentage(AFP)and the body weight of day 42(BW42)for each duck were collected.We identified a set of new loci that affect the traits related to fat deposition in avian.Among these loci,ceroid-lipofuscinosis,neuronal 8(CLN8)is a novel candidate gene controlling fat deposition.We investigated its novel function and regulation in avian adipogenesis.Five significant SNPs(the most significant SNP,P-value=21.37E-12)and a single haplotype were detected in the upstream of CLN8 for subcutaneous fat percentage.Subsequently,luciferase assay demonstrated that 5 linked SNPs in the upstream of the CLN8 gene significantly decreased the transcriptional activity of CLN8.Further,ATAC-seq analysis showed that transcription factor binding sites were identified in a region close to the haplotype.A set of luciferase reporter gene vectors that contained different deletion fragments of the CLN8 promoter were con-structed,and the core promoter area of CLN8 was finally identified in the-1,884/-1,207 bp region of the 5′flanking sequences,which contains adipogenesis-related transcription factors binding sites.Moreover,the over-expression of CLN8 can remarkably facilitate adipocyte differentiation in ICPs.Consistent with these,the global transcriptome profiling and functional analysis of the over-expressed CLN8 in the cell line further revealed that the lipid biosynthetic process during the adipogenesis was significantly enriched.Conclusions Our results demonstrated that CLN8 is a positive regulator of avian adipocyte differentiation.These findings identify a novel function of CLN8 in adipocyte differentiation,which provides important clues for the further study of the mechanism of avian fat deposition.展开更多
BACKGROUND Adult neuronal ceroid lipofuscinosis(ANCL)can be caused by compound heterozygous recessive mutations in CLN6.The main clinical features of the disease are neurodegeneration,progressive motor dysfunction,sei...BACKGROUND Adult neuronal ceroid lipofuscinosis(ANCL)can be caused by compound heterozygous recessive mutations in CLN6.The main clinical features of the disease are neurodegeneration,progressive motor dysfunction,seizures,cognitive decline,ataxia,vision loss and premature death.CASE SUMMARY A 37-year-old female presented to our clinic with a 3-year history of limb weakness and gradually experiencing unstable walking.The patient was diagnosed with CLN6 type ANCL after the identification of mutations in the CLN6 gene.The patient was treated with antiepileptic drugs.The patient is under ongoing followup.Unfortunately,the patient’s condition has deteriorated,and she is currently unable to care for herself.CONCLUSION There is presently no effective treatment for ANCL.However,early diagnosis and symptomatic treatment are possible.展开更多
目的:研究CLN3基因在卵巢浆液性癌及子宫内膜癌中的表达特点及与其发生发展的关系。方法:采用RT-PCR和W estern B lot方法检测卵巢浆液性肿瘤(良性浆液性肿瘤、交界性肿瘤、浆液性癌)组织、子宫内膜癌及癌旁组织、正常卵巢组织和正常子...目的:研究CLN3基因在卵巢浆液性癌及子宫内膜癌中的表达特点及与其发生发展的关系。方法:采用RT-PCR和W estern B lot方法检测卵巢浆液性肿瘤(良性浆液性肿瘤、交界性肿瘤、浆液性癌)组织、子宫内膜癌及癌旁组织、正常卵巢组织和正常子宫内膜组织中CLN3基因表达情况。结果:卵巢浆液性癌组织中CLN3 mRNA表达为3.04±0.58,交界性卵巢浆液性肿瘤组织中表达为1.63±0.43,均明显高于正常卵巢组织和良性卵巢浆液性肿瘤,差异显著(P<0.01);卵巢浆液性癌组织CLN3表达高于交界性卵巢浆液性肿瘤(P<0.01);卵巢浆液性癌患者不同临床分期(Ⅰ/Ⅱ期与Ⅲ/Ⅳ期)、病理分级及有无腹水间比较差异显著(P<0.05)。正常子宫内膜组织中CLN3呈低表达,在所有的子宫内膜癌及癌旁组织中发现CLN3 mRNA及蛋白表达上调(P<0.01)。结论:①CLN3基因与卵巢浆液性癌的发生发展、生物学行为和预后可能有关,可作为卵巢浆液性癌的重要的生物学标记物,是卵巢浆液癌防治的一个新靶点;②CLN3基因过表达可能与子宫内膜癌发生有关。展开更多
Objective: Batten disease （BD）, the juvenile form of neuronal ceroid lipofuscinosis （NCLs）, is pathological characterized by finding lysosomal storage of autofluorescent lipofuscins with unique ultrastructural pro...Objective: Batten disease （BD）, the juvenile form of neuronal ceroid lipofuscinosis （NCLs）, is pathological characterized by finding lysosomal storage of autofluorescent lipofuscins with unique ultrastructural profiles. The gene underlying BD is designated CLN3 and encodes a protein, Battenin, of unknown function that localizes in lysosomes and/or mitochondria. Previously, we hypothesized that Battenin associates with other membrane protein（s） to form a membrane complex. Dysfunction of this complex could result in the pathological changes of BD, and possibly in other NCLs. Two such membranous proteins, the slow and fast Battenin-interactive proteins （BIPs and BIPf） of unknown functions, have been identified. In this study, we have characterized the functional domains of Battenin that interact with both BIP proteins. Methods: Protein-protein interactions with a yeast two-hybrid system were employed. A “deletion assay” was employed to localize the interactive segment（s）. Different lengths of cDNA sequences lacking exon 1-5 were used to express CLN3-encoded proteins lacking N-terminal segments in the yeast two-hybrid system. N-terminal exons of CLN3 were deleted with PCR-cloning strategies.Results: We eliminated the possibility of interacting domains from the exon 7-encoded region because both Battenin and mBattenin interact with the BIP proteins. We have shown that peptide sequences encoded by exons 2 and 4 of CLN3 gene include the functional domains by which Battenin interacts with the BIP proteins. Conclusion: Our studies provide evidence that the N-terminus of Battenin is the functional domain for these protein interactions.展开更多
Lysosomes have many roles,including degrading macromolecules and signalling to the nucleus1.Lysosomal dysfunction occurs in various human conditions,such as common neurodegenerative diseases and monogenic lysosomal st...Lysosomes have many roles,including degrading macromolecules and signalling to the nucleus1.Lysosomal dysfunction occurs in various human conditions,such as common neurodegenerative diseases and monogenic lysosomal storage disorders(LSDs)2-4.For most LSDs,the causal genes have been identified but,in some,the function of the implicated gene is unknown,in part because lysosomes occupy a small fraction of the cellular volume so that changes in lysosomal contents are difficult to detect.Here we develop the LysoTag mouse for the tissue-specific isolation of intact lysosomes that are compatible with the multimodal profiling of their contents.We used the LysoTag mouse to study CLN3,a lysosomal transmembrane protein with an unknown function.In children,the loss of CLN3 causes juvenile neuronal ceroid lipofuscinosis(Batten disease),a lethal neurodegenerative LSD.Untargeted metabolite profiling of lysosomes from the brains of mice lacking CLN3 revealed a massive accumulation of glycerophosphodiesters(GPDs)-the end products of glycerophospholipid catabolism.GPDs also accumulate in the lysosomes of CLN3-deficient cultured cells and we show that CLN3 is required for their lysosomal egress.Loss of CLN3 also disrupts glycerophospholipid catabolism in the lysosome.Finally,we found elevated levels of glycerophosphoinositol in the cerebrospinal fluid of patients with Batten disease,suggesting the potential use of glycerophosphoinositol as a disease biomarker.Our results show that CLN3 is required for the lysosomal clearance of GPDs and reveal Batten disease as a neurodegenerative LSD with a defect in glycerophospholipid metabolism.展开更多
Three related patients from Colombia presented with a juvenileonset neuronal c eroid lipofuscinosis. Electron microscopy of one case showed condensed fingerpri nt profiles, and genetic analyses identified a novel miss...Three related patients from Colombia presented with a juvenileonset neuronal c eroid lipofuscinosis. Electron microscopy of one case showed condensed fingerpri nt profiles, and genetic analyses identified a novel missense mutation in CLN5. The authors demonstrate the existence of pathogenic CLN5 mutations outside north ern Europe and that mutations in this gene can lead to an atypical late-onset n euronal ceroid lipofuscinosis disease, in addition to the late infantile form fi rst described inFinland.展开更多
CLN3 is a lysosomal transmembrane protein and loss of CLN3 is known to cause a juvenile lethal neurodegenerative lysosomal storage disorder(LSD),called Batten disease.In a recent study published in Nature,Laqtom et al...CLN3 is a lysosomal transmembrane protein and loss of CLN3 is known to cause a juvenile lethal neurodegenerative lysosomal storage disorder(LSD),called Batten disease.In a recent study published in Nature,Laqtom et al.reported a novel function of CLN3 in the clearance of glycerophospholipid from lysosomes via lysosomal efflux of glycerophosphodiesters(GPDs),not only establishing a deeper mechanistic understanding of Batten disease,but also suggesting both the diagnostic and therapeutic potential of CLN3-GPDs in this type of neurodegenerative LSD.展开更多
基金supported by the National Key R&D Program of China(2022YFF1000100)National Waterfowl-Industry Technology Research System(CARS-42–09)+1 种基金National Nature Science Foundation of China(31972525,31572388)Beijing Joint Research Program for Germplasm Innovation and New Variety Breeding(G20220628007).
文摘Background The fat deposition has a crucial role in animal meat flavor,and fat deposition-related traits are vital for breeding in the commercial duck industry.Avian fat-related traits are typical complex phenotypes,which need a large amount of data to analyze the genetic loci.Results In this study,we performed a new phenotypic analysis of fat traits and genotyped whole-genome varia-tions for 1,246 ducks,and combed with previous GWAS data to reach 1,880 ducks for following analysis.The carcass composition traits,subcutaneous fat weight(SFW),subcutaneous fat percentage(SFP),abdominal fat weight(AFW),abdominal fat percentage(AFP)and the body weight of day 42(BW42)for each duck were collected.We identified a set of new loci that affect the traits related to fat deposition in avian.Among these loci,ceroid-lipofuscinosis,neuronal 8(CLN8)is a novel candidate gene controlling fat deposition.We investigated its novel function and regulation in avian adipogenesis.Five significant SNPs(the most significant SNP,P-value=21.37E-12)and a single haplotype were detected in the upstream of CLN8 for subcutaneous fat percentage.Subsequently,luciferase assay demonstrated that 5 linked SNPs in the upstream of the CLN8 gene significantly decreased the transcriptional activity of CLN8.Further,ATAC-seq analysis showed that transcription factor binding sites were identified in a region close to the haplotype.A set of luciferase reporter gene vectors that contained different deletion fragments of the CLN8 promoter were con-structed,and the core promoter area of CLN8 was finally identified in the-1,884/-1,207 bp region of the 5′flanking sequences,which contains adipogenesis-related transcription factors binding sites.Moreover,the over-expression of CLN8 can remarkably facilitate adipocyte differentiation in ICPs.Consistent with these,the global transcriptome profiling and functional analysis of the over-expressed CLN8 in the cell line further revealed that the lipid biosynthetic process during the adipogenesis was significantly enriched.Conclusions Our results demonstrated that CLN8 is a positive regulator of avian adipocyte differentiation.These findings identify a novel function of CLN8 in adipocyte differentiation,which provides important clues for the further study of the mechanism of avian fat deposition.
文摘BACKGROUND Adult neuronal ceroid lipofuscinosis(ANCL)can be caused by compound heterozygous recessive mutations in CLN6.The main clinical features of the disease are neurodegeneration,progressive motor dysfunction,seizures,cognitive decline,ataxia,vision loss and premature death.CASE SUMMARY A 37-year-old female presented to our clinic with a 3-year history of limb weakness and gradually experiencing unstable walking.The patient was diagnosed with CLN6 type ANCL after the identification of mutations in the CLN6 gene.The patient was treated with antiepileptic drugs.The patient is under ongoing followup.Unfortunately,the patient’s condition has deteriorated,and she is currently unable to care for herself.CONCLUSION There is presently no effective treatment for ANCL.However,early diagnosis and symptomatic treatment are possible.
文摘Objective: Batten disease （BD）, the juvenile form of neuronal ceroid lipofuscinosis （NCLs）, is pathological characterized by finding lysosomal storage of autofluorescent lipofuscins with unique ultrastructural profiles. The gene underlying BD is designated CLN3 and encodes a protein, Battenin, of unknown function that localizes in lysosomes and/or mitochondria. Previously, we hypothesized that Battenin associates with other membrane protein（s） to form a membrane complex. Dysfunction of this complex could result in the pathological changes of BD, and possibly in other NCLs. Two such membranous proteins, the slow and fast Battenin-interactive proteins （BIPs and BIPf） of unknown functions, have been identified. In this study, we have characterized the functional domains of Battenin that interact with both BIP proteins. Methods: Protein-protein interactions with a yeast two-hybrid system were employed. A “deletion assay” was employed to localize the interactive segment（s）. Different lengths of cDNA sequences lacking exon 1-5 were used to express CLN3-encoded proteins lacking N-terminal segments in the yeast two-hybrid system. N-terminal exons of CLN3 were deleted with PCR-cloning strategies.Results: We eliminated the possibility of interacting domains from the exon 7-encoded region because both Battenin and mBattenin interact with the BIP proteins. We have shown that peptide sequences encoded by exons 2 and 4 of CLN3 gene include the functional domains by which Battenin interacts with the BIP proteins. Conclusion: Our studies provide evidence that the N-terminus of Battenin is the functional domain for these protein interactions.
文摘Lysosomes have many roles,including degrading macromolecules and signalling to the nucleus1.Lysosomal dysfunction occurs in various human conditions,such as common neurodegenerative diseases and monogenic lysosomal storage disorders(LSDs)2-4.For most LSDs,the causal genes have been identified but,in some,the function of the implicated gene is unknown,in part because lysosomes occupy a small fraction of the cellular volume so that changes in lysosomal contents are difficult to detect.Here we develop the LysoTag mouse for the tissue-specific isolation of intact lysosomes that are compatible with the multimodal profiling of their contents.We used the LysoTag mouse to study CLN3,a lysosomal transmembrane protein with an unknown function.In children,the loss of CLN3 causes juvenile neuronal ceroid lipofuscinosis(Batten disease),a lethal neurodegenerative LSD.Untargeted metabolite profiling of lysosomes from the brains of mice lacking CLN3 revealed a massive accumulation of glycerophosphodiesters(GPDs)-the end products of glycerophospholipid catabolism.GPDs also accumulate in the lysosomes of CLN3-deficient cultured cells and we show that CLN3 is required for their lysosomal egress.Loss of CLN3 also disrupts glycerophospholipid catabolism in the lysosome.Finally,we found elevated levels of glycerophosphoinositol in the cerebrospinal fluid of patients with Batten disease,suggesting the potential use of glycerophosphoinositol as a disease biomarker.Our results show that CLN3 is required for the lysosomal clearance of GPDs and reveal Batten disease as a neurodegenerative LSD with a defect in glycerophospholipid metabolism.
文摘Three related patients from Colombia presented with a juvenileonset neuronal c eroid lipofuscinosis. Electron microscopy of one case showed condensed fingerpri nt profiles, and genetic analyses identified a novel missense mutation in CLN5. The authors demonstrate the existence of pathogenic CLN5 mutations outside north ern Europe and that mutations in this gene can lead to an atypical late-onset n euronal ceroid lipofuscinosis disease, in addition to the late infantile form fi rst described inFinland.
文摘CLN3 is a lysosomal transmembrane protein and loss of CLN3 is known to cause a juvenile lethal neurodegenerative lysosomal storage disorder(LSD),called Batten disease.In a recent study published in Nature,Laqtom et al.reported a novel function of CLN3 in the clearance of glycerophospholipid from lysosomes via lysosomal efflux of glycerophosphodiesters(GPDs),not only establishing a deeper mechanistic understanding of Batten disease,but also suggesting both the diagnostic and therapeutic potential of CLN3-GPDs in this type of neurodegenerative LSD.
