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Kannu P, Bateman JF, Belluoccio D, Fosang AJ, Savarirayan R. Employing molecular genetics of chondrodysplasias to inform the study of osteoarthritis. ACTA ACUST UNITED AC 2009; 60:325-34. [PMID: 19180483 DOI: 10.1002/art.24251] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Peter Kannu
- University of Melbourne, Murdoch Childrens Research Institute, Royal Children's Hospital, and Genetic Health Services Victoria, Parkville, Victoria, Australia.
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2
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Tselepis C, Hoyland JA, Barber RE, Thorp BH, Kwan APL. Expression and distribution of cartilage matrix macromolecules in Avian tibial dyschondroplasia. Avian Pathol 2007; 25:305-24. [DOI: 10.1080/03079459608419143] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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Wild P, Engels M, Senn C, Tobler K, Ziegler U, Schraner EM, Loepfe E, Ackermann M, Mueller M, Walther P. Impairment of nuclear pores in bovine herpesvirus 1-infected MDBK cells. J Virol 2005; 79:1071-83. [PMID: 15613336 PMCID: PMC538577 DOI: 10.1128/jvi.79.2.1071-1083.2005] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Herpesvirus capsids originating in the nucleus overcome the nucleocytoplasmic barrier by budding at the inner nuclear membrane. The fate of the resulting virions is still under debate. The fact that capsids approach Golgi membranes from the cytoplasmic side led to the theory of fusion between the viral envelope and the outer nuclear membrane, resulting in the release of capsids into the cytoplasm. We recently discovered a continuum from the perinuclear space to the Golgi complex implying (i) intracisternal viral transportation from the perinuclear space directly into Golgi cisternae and (ii) the existence of an alternative pathway of capsids from the nucleus to the cytoplasm. Here, we analyzed the nuclear surface by high-resolution microscopy. Confocal microscopy of MDBK cells infected with recombinant bovine herpesvirus 1 expressing green fluorescent protein fused to VP26 (a minor capsid protein) revealed distortions of the nuclear surface in the course of viral multiplication. High-resolution scanning and transmission electron microscopy proved the distortions to be related to enlargement of nuclear pores through which nuclear content including capsids protrudes into the cytoplasm, suggesting that capsids use impaired nuclear pores as gateways to gain access to the cytoplasmic matrix. Close examination of Golgi membranes, rough endoplasmic reticulum, and outer nuclear membrane yielded capsid-membrane interaction of high identity to the budding process at the inner nuclear membrane. These observations signify the ability of capsids to induce budding at any cell membrane, provided the fusion machinery is present and/or budding is not suppressed by viral proteins.
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Affiliation(s)
- Peter Wild
- Electron Microscopy Institute of Veterinary Anatomy, Winterthurerstrasse 266a, CH-8057 Zürich, Switzerland.
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Abstract
The proteoglycans, especially the large chondroitin sulfate proteoglycan aggrecan, have long been viewed as important components of the extracellular matrix of cartilage. The drastic change in expression during differentiation from mesenchyme to cartilage, the loss of tissue integrity associated with proteoglycan degradation in several disease processes and, most important, the demonstration of abnormalities in proteoglycan production concomitant with the aberrant growth patterns exhibited by the brachymorphic mouse, the cartilage matrix deficient mouse, and the nanomelic chick provide the strongest evidence that the proteoglycan aggrecan is essential during differentiation and for maintenance of the skeletal elements. More recently, mutations associated with proteoglycans other than aggrecan, especially the heparan sulfate proteoglycans, glypican and perlecan, suggest an important role for these molecules in skeletal development as well. This review focuses on the molecular bases of the hereditary proteoglycan defects in animal models, as well as of some human chondrodysplasias, that collectively are providing a better understanding of the role of proteoglycans in the development and maintenance of the skeletal elements.
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Affiliation(s)
- Nancy B Schwartz
- Department of Pediatrics, University of Chicago, MC 5058, 5826 S. Maryland Ave., Chicago, IL 60637, USA
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Schwartz NB, Pirok EW, Mensch JR, Domowicz MS. Domain organization, genomic structure, evolution, and regulation of expression of the aggrecan gene family. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 2001; 62:177-225. [PMID: 9932455 DOI: 10.1016/s0079-6603(08)60508-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Proteoglycans are complex macromolecules, consisting of a polypeptide backbone to which are covalently attached one or more glycosaminoglycan chains. Molecular cloning has allowed identification of the genes encoding the core proteins of various proteoglycans, leading to a better understanding of the diversity of proteoglycan structure and function, as well as to the evolution of a classification of proteoglycans on the basis of emerging gene families that encode the different core proteins. One such family includes several proteoglycans that have been grouped with aggrecan, the large aggregating chondroitin sulfate proteoglycan of cartilage, based on a high number of sequence similarities within the N- and C-terminal domains. Thus far these proteoglycans include versican, neurocan, and brevican. It is now apparent that these proteins, as a group, are truly a gene family with shared structural motifs on the protein and nucleotide (mRNA) levels, and with nearly identical genomic organizations. Clearly a common ancestral origin is indicated for the members of the aggrecan family of proteoglycans. However, differing patterns of amplification and divergence have also occurred within certain exons across species and family members, leading to the class-characteristic protein motifs in the central carbohydrate-rich region exclusively. Thus the overall domain organization strongly suggests that sequence conservation in the terminal globular domains underlies common functions, whereas differences in the central portions of the genes account for functional specialization among the members of this gene family.
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Affiliation(s)
- N B Schwartz
- Department of Pediatrics, University of Chicago, Illinois 60637, USA
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Chen TL, Wang PY, Luo W, Gwon SS, Flay NW, Zheng J, Guo C, Tanzer ML, Vertel BM. Aggrecan domains expected to traffic through the exocytic pathway are misdirected to the nucleus. Exp Cell Res 2001; 263:224-35. [PMID: 11161721 DOI: 10.1006/excr.2000.5093] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In this article, we report the misdirected targeting of expressed aggrecan domains. Aggrecan, the chondroitin sulfate (CS) proteoglycan of cartilage, normally progresses through the exocytic pathway. Proteins expressed from constructs containing the putative aggrecan signal sequence (i.e., the first 23 N-terminal amino acids), specified globular (G) domains G1 and/or G3, and a segment of the CS domain were detected in the endoplasmic reticulum (ER) and Golgi complex. Although proteins expressed from constructs containing the putative signal and G3, but lacking G1, were detected to a limited extent in the secretory pathway, they primarily accumulated in nuclei. Discrete nuclear inclusions were seen when G3 was expressed. Immunoelectron microscopic characterization of the inclusions suggested the association of nuclear G3 with other proteins. When signal-free G3 constructs and those with G3 immediately following the N-terminal signal were expressed, abundant dispersed accumulations filled the nucleoplasm. The data suggest first, that signal-free and signal-containing G3 proteins enter the nucleus from the cytosol, and second, that the entry of signal-containing G3 proteins into the ER lumen is inefficient. Hsp25, Hsp70, and ubiquitin were colocalized with nuclear G3, indicating the involvement of chaperones and the degradative machinery in the formation and/or attempted disposal of the abnormal nuclear inclusions. Overall, the results focus attention on (1) intracellular protein trafficking at the ER membrane and the nuclear envelope and (2) chaperone interactions and mechanisms leading to abnormal protein deposition in the nucleus.
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Affiliation(s)
- T L Chen
- Department of Cell Biology & Anatomy, FUHS/The Chicago Medical School, North Chicago, Illinois, 60064, USA
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Champliaud MF, Champliaud D, Albalat R, Burgeson R, Magro C, Baden HP. Localization and characterization of the RNA binding protein TLS in skin and stratified mucosa. J Invest Dermatol 1998; 110:277-81. [PMID: 9506449 DOI: 10.1046/j.1523-1747.1998.00127.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Translocated in liposarcoma (TLS), a member of the Ewing's sarcoma family of RNA binding proteins, is targeted to the product of RNA POL II and functions in nuclear events as well as in nuclear-cytoplasmic transport of mRNA. It has been most extensively studied in cell lines, but was identified in several rat tissues by northern blot analysis, with adipose tissue showing the highest expression followed by whole skin. This paper describes a protein with amino acid sequence homology to TLS that was isolated from bovine tongue epithelium using an affinity column made with an antibody to the cornified envelope precursor sciellin. Using reverse transcriptase polymerase chain reaction technology and total RNA isolated from bovine tongue epithelium, a cDNA was obtained whose nucleotide sequence coded for a protein homologous to human TLS. Nuclear staining in all layers of human epidermis and bovine stratified epithelium was observed with an antibody to TLS, whereas peripheral staining of the upper layers of these tissues was observed with the antibody to sciellin. Cultured cells gave similar results; however, adult tissue required boiling in citrate buffer to unmask antigenic sites before reacting with the TLS antibody. Western blots of extracts of human and bovine keratinocytes using TLS and sciellin antibodies showed that the two proteins shared at least one epitope, but that they were different. TLS was lost from the nucleus following inhibition of RNA POL II activity and the protein was identified in CNBr extracts of purified keratinocytes cornified envelopes by western blot. These results clearly indicate that TLS functions as an RNA binding protein in keratinocytes in vivo and in vitro. Furthermore the sequestration of TLS to the cell envelope may play a role in regulating its nuclear-cytoplasmic transport and effect its role in transcription.
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Affiliation(s)
- M F Champliaud
- Department of Dermatology, Harvard Medical School, Massachusetts General Hospital, Boston 02129, USA
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Primorac D, Stover ML, Clark SH, Rowe DW. Molecular basis of nanomelia, a heritable chondrodystrophy of chicken. Matrix Biol 1994; 14:297-305. [PMID: 7827752 DOI: 10.1016/0945-053x(94)90195-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Nanomelia is a recessively inherited connective tissue disorder of chicken affecting cartilage development. Other investigators have demonstrated that it involves low aggrecan production and diminished aggrecan mRNA levels. Based on genetic linkage studies showing a high likelihood that the mutation responsible for the nanomelic phenotype lay within the aggrecan gene, a series of experiments was performed to define the molecular basis of the trait. Aggrecan mRNA was present in the nucleus of the nanomelic chondrocyte but greatly reduced in the cytoplasmic compartment, a finding suggestive of a premature stop codon within the aggrecan transcript. Since no defect in mRNA splicing could be demonstrated by ribonucleasease protection studies, direct DNA sequencing was initiated by polymerase chain reaction of the mRNA and of genomic DNA. A stop codon was demonstrated at codon 1513, which is located in the eighth repeat of the chondroitin sulfate 2 domain of the large tenth exon. The mutation creates a unique BasBI restriction site which readily distinguishes the mutant and wild-type alleles.
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Affiliation(s)
- D Primorac
- Department of Pediatrics, University of Connecticut Health Center, Farmington
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Watanabe H, Kimata K, Line S, Strong D, Gao LY, Kozak CA, Yamada Y. Mouse cartilage matrix deficiency (cmd) caused by a 7 bp deletion in the aggrecan gene. Nat Genet 1994; 7:154-7. [PMID: 7920633 DOI: 10.1038/ng0694-154] [Citation(s) in RCA: 199] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Mouse cartilage matrix deficiency (cmd) is an autosomal recessive mutation characterized by cleft palate, short limbs, tail and snout. Heterozygous mice show normal size and phenotype, while homozygous mice die just after birth due to respiratory failure. Biochemical and immunohistochemical characterization of cmd cartilage reveals normal levels of type II collagen and link protein, but an absence of the large cartilage proteoglycan, aggrecan. Here, we have mapped the aggrecan gene to a region of mouse chromosome 7 near the cmd locus. DNA sequencing of the aggrecan gene identified a 7 bp deletion in exon 5 resulting in a severely truncated molecule. The finding of an aggrecan mutation in the cmd mouse confirms the critical role of aggrecan in cartilage formation.
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Affiliation(s)
- H Watanabe
- Laboratory of Developmental Biology, National Institute of Dental Research, National Institutes of Health, Bethesda, Maryland 20892
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Upholt WB, Chandrasekaran L, Tanzer ML. Molecular cloning and analysis of the protein modules of aggrecans. EXS 1994; 70:37-52. [PMID: 8298251 DOI: 10.1007/978-3-0348-7545-5_4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The large aggregating chondroitin sulfate proteoglycan of cartilage, aggrecan, has served as a prototype of proteoglycan structure. Molecular cloning has elucidated its primary structure and revealed both known and unknown domains. To date the complete structures of chicken, rat and human aggrecans have been deduced, while partial sequences have been reported for bovine aggrecan. A related proteoglycan, human versican, has also been cloned and sequenced. Both aggrecan and versican have two lectin domains, one at the amino-terminus which binds hyaluronic acid and one at the carboxyl-terminus whose physiological ligand is unknown. Both lectins have homologous counterparts in other types of proteins. Within the aggrecans the keratan sulfate domain may be variably present and also has a prominent repeat in some species. The chondroitin sulfate domain has three distinct regions which vary in their prominence in different species. The complex molecular structure of aggrecans is consistent with the concept of exon shuffling and aggrecans serve as suitable prototypes for comprehending the evolution of multi-domain proteins.
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Affiliation(s)
- W B Upholt
- Department of BioStructure and Function, School of Dental Medicine, University of Connecticut Health Center, Farmington 06030-3705
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11
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cDNA cloning of chick cartilage chondroitin sulfate (aggrecan) core protein and identification of a stop codon in the aggrecan gene associated with the chondrodystrophy, nanomelia. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(19)49491-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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12
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Upholt WB, Chandrasekaran L, Tanzer ML. Molecular cloning and analysis of the protein modules of aggrecans. EXPERIENTIA 1993; 49:384-92. [PMID: 8500594 DOI: 10.1007/bf01923583] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The large aggregating chondroitin sulfate proteoglycan of cartilage, aggrecan, has served as a prototype of proteoglycan structure. Molecular cloning has elucidated its primary structure and revealed both known and unknown domains. To date the complete structures of chicken, rat and human aggrecans have been deduced, while partial sequences have been reported for bovine aggrecan. A related proteoglycan, human versican, has also been cloned and sequenced. Both aggrecan and versican have two lectin domains, one at the amino-terminus which binds hyaluronic acid and one at the carboxyl-terminus whose physiological ligand is unknown. Both lectins have homologous counterparts in other types of proteins. Within the aggrecans the keratan sulfate domain may be variably present and also has a prominent repeat in some species. The chondroitin sulfate domain has three distinct regions which vary in their prominence in different species. The complex molecular structure of aggrecans is consistent with the concept of exon shuffling and aggrecans serve as suitable prototypes for comprehending the evolution of multi-domain proteins.
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Affiliation(s)
- W B Upholt
- Department of BioStructure and Function, School of Dental Medicine, University of Connecticut Health Center, Farmington 06030-3705
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Vertel BM, Walters LM, Grier B, Maine N, Goetinck PF. Nanomelic chondrocytes synthesize, but fail to translocate, a truncated aggrecan precursor. J Cell Sci 1993; 104 ( Pt 3):939-48. [PMID: 8314884 DOI: 10.1242/jcs.104.3.939] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cartilage extracellular matrix (ECM) is composed primarily of type II collagen and large, link stabilized aggregates of hyaluronic acid and chondroitin sulfate proteoglycan (aggrecan). Maturation and function of these complex macromolecules are dependent upon sequential processing events which occur during their movements through specific subcellular compartments in the constitutive secretory pathway. Failure to complete these events successfully results in assembly of a defective ECM and may produce skeletal abnormalities. Nanomelia is a lethal genetic mutation of chickens characterized by shortened and malformed limbs. Previous biochemical studies have shown that cultured nanomelic chondrocytes synthesize a truncated aggrecan core protein precursor that disappears with time; however, the protein does not appear to be processed by the Golgi or secreted. The present study investigates the intracellular trafficking of the defective aggrecan precursor using immunofluorescence, immunoelectron microscopy and several inhibitors. Results indicate that nanomelic chondrocytes assemble an ECM that contains type II collagen, but lacks aggrecan. Instead, aggrecan precursor was localized intracellularly, within small cytoplasmic structures corresponding to extensions of the endoplasmic reticulum (ER). At no time were precursor molecules observed in the Golgi. In contrast, normal and nanomelic chondrocytes exhibited no difference in the intracellular or extracellular distribution of type II procollagen. Therefore, retention of the aggrecan precursor appears to be selective. Incubation of chondrocytes at 15 degrees C resulted in the retention and accumulation of product in the ER. After a return to 37 degrees C, translocation of the product to the Golgi was observed for normal, but not for nanomelic, chondrocytes, although the precursors disappeared with time. Ammonium chloride, an inhibitor of lysosomal function, had no effect on protein loss, suggesting that the precursor was removed by a non-lysosomal mechanism, possibly by ER-associated degradation. Based on these studies, we suggest that nanomelic chondrocytes are a useful model for examining cellular trafficking and sorting events and the processes by which abnormal products are targeted for retention or degradation. Further investigations should provide insight into the mechanisms underlying chondrodystrophies and other related diseases.
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Affiliation(s)
- B M Vertel
- Department of Cell Biology and Anatomy, University of Health Sciences, Chicago Medical School, IL 60064
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Vertel BM, Walters LM, Mills D. Subcompartments of the endoplasmic reticulum. SEMINARS IN CELL BIOLOGY 1992; 3:325-41. [PMID: 1457776 DOI: 10.1016/1043-4682(92)90019-r] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The endoplasmic reticulum (ER) is the largest continuous endomembrane structure in the cytoplasm. It may be viewed as a series of unique subcompartments. In this review, we examine the rough ER, nuclear envelope and several smooth ER subcompartments. Consideration is given to the characteristic properties and functions of the ER and its domains, and to the formation and maintenance of subcompartments. Associations within the ER membrane bilayer, and with constituents of the cytoplasm and the ER lumen, contribute to the formation of domains and lead to the establishment of subcompartments that reflect specialized functions and vary according to the physiologic state and phenotype of the individual cell. Although the structural complexity of some ER subcompartments (such as the sarcoplasmic reticulum) is highly elaborate, the ER remains a dynamic organelle, subject to assembly and disassembly, capable of extensive remodelling and active in exchange with other organelles through mechanisms of membrane transport.
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Affiliation(s)
- B M Vertel
- Department of Cell Biology and Anatomy, Chicago Medical School, IL 60064
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Wong M, Lawton T, Goetinck P, Kuhn J, Goldstein S, Bonadio J. Aggrecan core protein is expressed in membranous bone of the chick embryo. Molecular and biomechanical studies of normal and nanomelia embryos. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)42806-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Velleman SG, Clark SH. The cartilage proteoglycan deficient mutation, nanomelia, contains a DNA polymorphism in the proteoglycan core protein gene that is genetically linked to the nanomelia phenotype. MATRIX (STUTTGART, GERMANY) 1992; 12:66-72. [PMID: 1560791 DOI: 10.1016/s0934-8832(11)80106-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The avian mutation, nanomelia (nm), is an autosomal recessive embryonic lethal. Homozygous embryos show hypoplasia of the limbs and a parrot-like beak. Biochemical studies have associated this phenotype with the absence of the major cartilage specific proteoglycan core protein (Argraves et al., 1981). Stirpe et al. (1987) demonstrated a reduction in core protein transcripts in nanomelic embryos. Southern analyses did not detect a rearrangement of the core protein gene or a restriction fragment length polymorphism (RFLP) in the core protein gene linked to the nanomelia mutation. These data suggest that the genetic lesion associated with the nanomelia mutation is either a subtle alteration in the core protein gene affecting the biosynthesis of core protein transcript or a defect in a regulatory gene that produces a trans-acting factor requisite for the proper expression of the core protein gene. To distinguish between these two alternative molecular mechanisms for the nanomelia mutation, experiments were conducted to demonstrate genetic linkage or non-linkage of the core protein gene to the nanomelia mutation. Using denaturing gradient gel electrophoresis (DGGE) technology, a DNA polymorphism has been identified at the 3' end of the core protein gene. The polymorphism defines two alleles, one allele is associated with the normal core protein gene, while the other allele always segregates with the nanomelia mutation. These results suggest that the identified DNA polymorphism in the core protein gene is genetically linked to the inheritance of the nanomelic phenotype and the nanomelia mutation contains a lesion in the core protein gene.
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Affiliation(s)
- S G Velleman
- Department of Molecular and Cell Biology, University of Connecticut, Storrs 06269-4039
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Affiliation(s)
- P F Goetinck
- La Jolla Cancer Research Foundation, California 92037
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Pulkkinen L, Kainulainen K, Krusius T, Mäkinen P, Schollin J, Gustavsson KH, Peltonen L. Deficient expression of the gene coding for decorin in a lethal form of Marfan syndrome. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(18)38231-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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