1
|
Endogenous calcitonin regulates lipid and glucose metabolism in diet-induced obesity mice. Sci Rep 2018; 8:17001. [PMID: 30451912 PMCID: PMC6242993 DOI: 10.1038/s41598-018-35369-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 11/05/2018] [Indexed: 12/22/2022] Open
Abstract
Calcitonin (CT) plays an important role in calcium homeostasis, and its precursor, proCT, is positively associated with the body mass index in the general human population. However, the physiological role of endogenous CT in the regulation of metabolism remains unclear. Knockout mice with gene-targeted deletion of exon 4 of Calca (CT KO) were generated by targeted modification in embryonic stem cells. Male mice were used in all experiments and were fed a slightly higher fat diet than the standard diet. The CT KO mice did not exhibit any abnormal findings in appearance, but exhibited weight loss from 15 months old, i.e., significantly decreased liver, adipose tissue, and kidney weights, compared with wild-type control mice. Furthermore, CT KO mice exhibited significantly decreased fat contents in the liver, lipid droplets in adipose tissues, serum glucose, and lipid levels, and significantly increased insulin sensitivity and serum adiponectin levels. CT significantly promoted 3T3-L1 adipocyte differentiation and suppressed adiponectin release. These results suggested that CT gene deletion prevents obesity, hyperglycemia, and hyperlipidemia in aged male mice. This is the first definitive evidence that CT may contribute to glucose and lipid metabolism in aged male mice, possibly via decreased adiponectin secretion from adipocytes.
Collapse
|
2
|
|
3
|
de Lecea L, Ruiz-Lozano P, Danielson PE, Peelle-Kirley J, Foye PE, Frankel WN, Sutcliffe JG. Cloning, mRNA expression, and chromosomal mapping of mouse and human preprocortistatin. Genomics 1997; 42:499-506. [PMID: 9205124 DOI: 10.1006/geno.1997.4763] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Cortistatin is a 14-residue putative neuropeptide with strong structural similarity to somatostatin and is expressed predominantly in cortical GABAergic interneurons of rats. Administration of cortistatin into the brain ventricles specifically enhances slow-wave sleep, presumably by antagonizing the effects of acetylcholine on cortical excitability. Here we report the identification of cDNAs corresponding to mouse and human preprocortistatin and the mRNA distribution and gene mapping of mouse cortistatin. Analysis of the nucleotide and predicted amino acid sequences from rat and mouse reveals that the 14 C-terminal residues of preprocortistatin, which make up the sequence that is most similar to somatostatin, are conserved between species. Lack of conservation of other dibasic amino acid residues whose cleavage by prohormone convertases would give rise to additional peptides suggests that cortistatin-14 is the only active peptide derived from the precursor. As in the rat, mouse preprocortistatin mRNA is present in GABAergic interneurons in the cerebral cortex and hippocampus. The preprocortistatin gene maps to mouse chromosome 4, in a region showing conserved synteny with human 1p36. The human putative cortistatin peptide has an arginine for lysine substitution, compared to the rat and mouse products, and is N-terminally extended by 3 amino acids.
Collapse
Affiliation(s)
- L de Lecea
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA
| | | | | | | | | | | | | |
Collapse
|
4
|
Malas S, Pilz A, Lalley PA, Pate L, Stephenson DA, Abbott C. The isolation and mapping of PCR markers specific to mouse Chromosome 2. Mamm Genome 1996; 7:145-8. [PMID: 8835533 DOI: 10.1007/s003359900036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- S Malas
- Department of Genetics and Biometry, University College London, UK
| | | | | | | | | | | |
Collapse
|
5
|
Thue TD, Schmutz SM. Localization of the somatostatin gene to bovine chromosome 1q23-q25 by in situ hydridization. Mamm Genome 1995; 6:688-9. [PMID: 8535091 DOI: 10.1007/bf00352390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- T D Thue
- Department of Animal & Poultry Science, University of Saskatchewan, Saskatoon, Canada
| | | |
Collapse
|
6
|
Takada F, Seki N, Matsuda Y, Takayama Y, Kawakami M. Localization of the genes for the 100-kDa complement-activating components of Ra-reactive factor (CRARF and Crarf) to human 3q27-q28 and mouse 16B2-B3. Genomics 1995; 25:757-9. [PMID: 7759119 DOI: 10.1016/0888-7543(95)80027-j] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Human and mouse genes for the complement-activating component (P100) of Ra-reactive factor, a novel bactericidal factor (CRARF and Crarf), were mapped to R-banded metaphase chromosomes by fluorescence in situ hybridization with human and mouse P100 cDNA 2.7 and 2.0 kb long, respectively. The localization of fluorescent signals showed that CRARF and Crarf mapped to human 3q27-q28 and mouse 16B2-B3, respectively. This evidence is consistent with the previous assumption that the distal portion of the long arm of human chromosome 3 is homologous to the proximal portion of mouse chromosome 16.
Collapse
Affiliation(s)
- F Takada
- Department of Molecular Biology, Kitasato University School of Medicine, Japan
| | | | | | | | | |
Collapse
|
7
|
Nadeau JH, Davisson MT, Doolittle DP, Grant P, Hillyard AL, Kosowsky MR, Roderick TH. Comparative map for mice and humans. Mamm Genome 1992; 3:480-536. [PMID: 1392257 DOI: 10.1007/bf00778825] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- J H Nadeau
- Jackson Laboratory, Bar Harbor, Maine 04609
| | | | | | | | | | | | | |
Collapse
|
8
|
Rinchik EM, Magnuson T, Holdener-Kenny B, Kelsey G, Bianchi A, Conti CJ, Chartier F, Brown KA, Brown SD, Peters J. Mouse chromosome 7. Mamm Genome 1992; 3 Spec No:S104-20. [PMID: 1498426 DOI: 10.1007/bf00648425] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- E M Rinchik
- Biology Division, Oak Ridge National Laboratory, Tennessee 37831-8077
| | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Affiliation(s)
- R H Reeves
- Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | | |
Collapse
|
10
|
Affiliation(s)
- L D Siracusa
- Jefferson Cancer Institute, Department of Microbiology and Immunology, Philadelphia, Pennsylvania 19107-5541
| | | |
Collapse
|
11
|
Malo D, Schurr E, Dorfman J, Canfield V, Levenson R, Gros P. Three brain sodium channel alpha-subunit genes are clustered on the proximal segment of mouse chromosome 2. Genomics 1991; 10:666-72. [PMID: 1679748 DOI: 10.1016/0888-7543(91)90450-s] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We have used long-range physical mapping and restriction fragment length polymorphisms between two mouse species to determine the chromosomal organization and location of the genes encoding three distinct isoforms of the alpha-subunit of the brain sodium channel. Physical mapping by pulsed-field gel electrophoresis has established that Scn2a and Scn3a (genes encoding type II and type III sodium channel alpha-subunit isoforms) are physically linked and are separated by a maximum distance of 600 kb. The segregation of restriction fragment length variations in backcross progeny of a Mus musculus and Mus spretus mating indicates that Scn 1 a (gene encoding the type I sodium channel alpha subunit) and Scn2a are tightly linked and are separated by a distance of 0.7 cM. Linkage analysis in backcross and recombinant inbred (BXD and AKXD) strains of mice localized the three sodium channel genes to the proximal segment of mouse chromosome 2 and suggested the probable gene order centromere-Hc-Neb-Pmv7-Scn2a/Scn3a-Scn1a-Mpmv 14. These results indicate that the three isoforms of the brain sodium channel alpha-subunit are encoded by three distinct genes that share a common ancestral origin.
Collapse
Affiliation(s)
- D Malo
- Department of Biochemistry, McGill University, Montreal, Canada
| | | | | | | | | | | |
Collapse
|
12
|
Nadeau JH, Davisson MT, Doolittle DP, Grant P, Hillyard AL, Kosowsky M, Roderick TH. Comparative map for mice and humans. Mamm Genome 1991; 1 Spec No:S461-515. [PMID: 1799811 DOI: 10.1007/bf00656504] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- J H Nadeau
- Jackson Laboratory, Bar Harbor, ME 04609
| | | | | | | | | | | | | |
Collapse
|
13
|
Rinchik EM, Saunders AM, Holdener-Kenny B, Sutcliffe MJ, Brown KA, Brown SD, Peters J. Mouse chromosome 7. Mamm Genome 1991; 1 Spec No:S97-111. [PMID: 1799814 DOI: 10.1007/bf00656488] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- E M Rinchik
- Biology Division, Oak Ridge National Laboratory, TN 37831
| | | | | | | | | | | | | |
Collapse
|
14
|
Affiliation(s)
- R H Reeves
- Developmental Genetics Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | | | | |
Collapse
|
15
|
Affiliation(s)
- L D Siracusa
- Jefferson Cancer Institute, Department of Microbiology and Immunology, Philadelphia, PA 19107-5541
| | | |
Collapse
|
16
|
Affiliation(s)
- J H Nadeau
- Jackson Laboratory, Bar Harbor, ME 04609
| | | |
Collapse
|
17
|
Abstract
The homology between mouse chromosome 7 and human chromosomes 11, 15, and 19 was examined using interspecific backcross animals derived from mating C3H/HeJ-gld/gld and Mus spretus mice. In an earlier study, we reported on the linkage relationships of 16 loci on mouse chromosome 7 and the homologous relationship between this chromosome and the myotonic dystrophy gene region on human chromosome 19. Segregation analyses were used to extend the gene linkage relationships on mouse chromosome 7 by an additional 21 loci. Seven of these genes (Cyp2a, D19F11S1h, Myod-1, Otf-2, Rnu1p70, Rnu2pa, and Xrcc-1) were previously unmapped in the mouse. Several potential mouse chromosome 7 genes (Mel, Hkr-1, Icam-1, Pvs) did not segregate with chromosome 7 markers, and provisional chromosomal assignments were made. This study establishes a detailed molecular genetic linkage map of mouse chromosome 7 that will be useful as a framework for determining linkage relationships of additional molecular markers and for identifying homologous disease genes in mice and humans.
Collapse
Affiliation(s)
- A M Saunders
- Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710
| | | |
Collapse
|
18
|
Scrable HJ, Johnson DK, Rinchik EM, Cavenee WK. Rhabdomyosarcoma-associated locus and MYOD1 are syntenic but separate loci on the short arm of human chromosome 11. Proc Natl Acad Sci U S A 1990; 87:2182-6. [PMID: 2315312 PMCID: PMC53650 DOI: 10.1073/pnas.87.6.2182] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The MYOD1 locus is preferentially expressed in skeletal muscle and at higher levels in its related neoplasm, rhabdomyosarcoma. We have combined physical mapping of the human locus with meiotic and physical mapping in the mouse, together with synteny homologies between the two species, to compare the physical relationship between MYOD1 and the genetically ascertained human rhabdomyosarcoma-associated locus. We have determined that the myogenic differentiation gene is tightly linked to the structural gene for the M (muscle) subunit of lactate dehydrogenase in band p15.4 on human chromosome 11 and close to the p and Ldh-1 loci in the homologous region of mouse chromosome 7. Because the rhabdomyosarcoma locus maps to 11p15.5, MYOD1 is very unlikely to be the primary site of alteration in these tumors. Further, these analyses identify two syntenic clusters of muscle-associated genes on the short arm of human chromosome 11, one in the region of rhabdomyosarcoma locus that includes IGF2 and TH and the second the tightly linked MYOD1 and LDHA loci, which have been evolutionarily conserved in homologous regions of both the mouse and the rat genomes.
Collapse
Affiliation(s)
- H J Scrable
- Ludwig Institute for Cancer Research, Montreal, PQ Canada
| | | | | | | |
Collapse
|
19
|
Siracusa LD, Silan CM, Justice MJ, Mercer JA, Bauskin AR, Ben-Neriah Y, Duboule D, Hastie ND, Copeland NG, Jenkins NA. A molecular genetic linkage map of mouse chromosome 2. Genomics 1990; 6:491-504. [PMID: 1970329 DOI: 10.1016/0888-7543(90)90479-e] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Interspecific backcross mice were used to create a molecular genetic linkage map of chromosome 2. Genomic DNAs from N2 progeny were subjected to Southern blot analysis using molecular probes that identified the Abl, Acra, Ass, C5, Cas-1, Fshb, Gcg, Hox-5.1, Jgf-1, Kras-3, Ltk, Pax-1, Prn-p, and Spna-2 loci; these loci were added to the 11 loci previously mapped to the distal region of chromosome 2 in the same interspecific backcross to generate a composite multilocus linkage map. Several loci mapped near, and may be the same as, known mutations. Comparisons between the mouse and the human genomes indicate that mouse chromosome 2 contains regions homologous to at least six human chromosomes. Mouse models for human diseases are discussed.
Collapse
Affiliation(s)
- L D Siracusa
- Mammalian Genetics Laboratory, NCI-Frederick Cancer Research Facility, Maryland 21701
| | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Brilliant MH, Szabo G, Katarova Z, Kozak CA, Glaser TM, Greenspan RJ, Housman DE. Sequences homologous to glutamic acid decarboxylase cDNA are present on mouse chromosomes 2 and 10. Genomics 1990; 6:115-22. [PMID: 1968040 DOI: 10.1016/0888-7543(90)90455-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The chromosomal locations of mouse DNA sequences homologous to a feline cDNA clone encoding glutamic acid decarboxylase (GAD) were determined. Although cats and humans are thought to have only one gene for GAD, GAD cDNA sequences hybridize to two distinct chromosomal loci in the mouse, chromosomes 2 and 10. The chromosomal assignment of sequences homologous to GAD cDNA was determined by Southern hybridization analysis using DNA from mouse-hamster hybrid cells. Mouse genomic sequences homologous to GAD cDNA were isolated and used to determine that GAD is encoded by a locus on mouse chromosome 2 (Gad-1) and that an apparent pseudogene locus is on chromosome 10 (Gad-1ps). An interspecific backcross and recombinant inbred strain sets were used to map these two loci relative to other loci on their respective chromosomes. The Gad-1 locus is part of a conserved homology between mouse chromosome 2 and the long arm of human chromosome 2.
Collapse
|
21
|
Glaser T, Matthews KE, Hudson JW, Seth P, Housman DE, Crerar MM. Localization of the muscle, liver, and brain glycogen phosphorylase genes on linkage maps of mouse chromosomes 19, 12, and 2, respectively. Genomics 1989; 5:510-21. [PMID: 2575583 DOI: 10.1016/0888-7543(89)90017-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Mammalian glycogen phosphorylases comprise a family of three isozymes, muscle, liver, and brain, which are expressed selectively and to varying extents in a wide variety of cell types. To better understand the regulation of phosphorylase gene expression, we isolated partial cDNAs for all three isozymes from the rat and used these to map the corresponding genes in the mouse. Chromosome mapping was accomplished by comparing the segregation of phosphorylase restriction fragment length polymorphisms (RFLPs) with 16 reference loci in a multipoint interspecies backcross between Mus musculus domesticus and Mus spretus. The genes encoding muscle, liver, and brain phosphorylases (Pygm, Pygl, and Pygb) are assigned to mouse chromosomes 19, 12, and 2, respectively. Their location on separate chromosomes indicates that distinct cis-acting elements govern the differential expression of phosphorylase isozymes in various tissues. Our findings significantly extend the genetic maps of mouse chromosomes 2, 12, and 19 and can be used to define the location of phosphorylase genes in man more precisely. Finally, this analysis suggests that the previously mapped "muscle-deficient" mutation in mouse, mdf, is closely linked to the muscle phosphorylase gene. However, muscle phosphorylase gene structure and expression appear to be unaltered in mdf/mdf mice, indicating that this mutation is not an animal model for the human genetic disorder McArdle's disease.
Collapse
Affiliation(s)
- T Glaser
- Center for Cancer Research, Massachusetts Institute of Technology, Cambridge 02139
| | | | | | | | | | | |
Collapse
|
22
|
Foreman ME, Womack JE. Genetic and synteny mapping of parathyroid hormone and beta hemoglobin in cattle. Biochem Genet 1989; 27:541-50. [PMID: 2575898 DOI: 10.1007/bf02396151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Parathyroid hormone and the beta hemoglobin gene cluster, which are closely linked on human chromosome 11p15, were localized to bovine syntenic group (U7) with the gene for catalase by the use of bovine x hamster hybrid somatic cells. Restriction fragment length polymorphisms (RFLPs) were followed through informative pedigrees to determine a linkage map distance of 15.6 +/- 5.4 cM between the parathyroid hormone and hemoglobin genes. Allelic frequencies of the DNA fragment were compared in a small sampling of cattle from five different breeds.
Collapse
Affiliation(s)
- M E Foreman
- Department of Veterinary Pathology, College of Veterinary Medicine, Texas A&M University, College Station 77843
| | | |
Collapse
|
23
|
Barton DE, Yang-Feng TL, Mason AJ, Seeburg PH, Francke U. Mapping of genes for inhibin subunits alpha, beta A, and beta B on human and mouse chromosomes and studies of jsd mice. Genomics 1989; 5:91-9. [PMID: 2767687 DOI: 10.1016/0888-7543(89)90091-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Inhibin (INH) is a gonadal glycoprotein hormone that regulates pituitary FSH secretion and may also play a role in the regulation of androgen biosynthesis. There are two forms of inhibin that strongly inhibit pituitary FSH secretion. These share the same alpha subunit that is covalently linked to one of two distinct beta subunits (beta A or beta B). However, dimers of two beta subunits are potent stimulators of FSH synthesis and release in vitro. The beta subunits share extensive sequence similarity with transforming growth factor beta. Recently isolated cDNAs for all three inhibin subunits have been used to map their cognate loci on human and mouse chromosomes by Southern blot analysis of somatic cell hybrid DNAs and by in situ hybridization. INH alpha and INH beta B genes were assigned to human chromosome 2, regions q33----qter and cen----q13, respectively, and to mouse chromosome 1. The INH beta A locus was mapped to human chromosome 7p15----p14 and mouse chromosome 13. The region of mouse chromosome 1 that carries other genes known to have homologs on human chromosome 2q includes the jsd locus (for juvenile spermatogonial depletion). Adult jsd/jsd mice have elevated levels of serum FSH and their testes are devoid of spermatogonial cells. The possibility that the mutation in jsd involves the INH alpha or INH beta B gene was investigated by Southern blotting of DNA from jsd/jsd mice, and no major deletions or rearrangements were detected.
Collapse
Affiliation(s)
- D E Barton
- Department of Human Genetics, Yale University School of Medicine, New Haven, Connecticut 06510
| | | | | | | | | |
Collapse
|
24
|
Searle AG, Peters J, Lyon MF, Hall JG, Evans EP, Edwards JH, Buckle VJ. Chromosome maps of man and mouse. IV. Ann Hum Genet 1989; 53:89-140. [PMID: 2688541 DOI: 10.1111/j.1469-1809.1989.tb01777.x] [Citation(s) in RCA: 161] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Current knowledge of man-mouse genetic homology is presented in the form of chromosomal displays, tables and a grid, which show locations of the 322 loci now assigned to chromosomes in both species, as well as 12 DNA segments not yet associated with gene loci. At least 50 conserved autosomal segments with two or more loci have been identified, twelve of which are over 20 cM long in the mouse, as well as five conserved segments on the X chromosome. All human and mouse chromosomes now have conserved regions; human 17 still shows the least evidence of rearrangement, with a single long conserved segment which apparently spans the centromere. The loci include 102 which are known to be associated with human hereditary disease; these are listed separately. Human parental effects which may well be the result of genomic imprinting are reviewed and the location of the factors concerned displayed in relation to mouse chromosomal regions which have been implicated in imprinting phenomena.
Collapse
Affiliation(s)
- A G Searle
- MRC Radiobiology Unit, Chilton, Didcot, Oxon
| | | | | | | | | | | | | |
Collapse
|
25
|
O'Hara BF, Bendotti C, Reeves RH, Oster-Granite ML, Coyle JT, Gearhart JD. Genetic mapping and analysis of somatostatin expression in Snell dwarf mice. Brain Res 1988; 464:283-92. [PMID: 2906811 DOI: 10.1016/0169-328x(88)90037-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Mice homozygous for the gene dwarf (dw) have elevated levels of somatostatin (SS) in extra-hypothalamic brain regions. By in situ hybridization, increased levels of SS mRNA were observed in regions shown previously to contain higher levels of the SS peptide. Thus, the rate of transcription and/or the stability of SS mRNA are affected by the dw mutation. Since both dw and the gene encoding SS, Smst, are located on mouse chromosome 16, two backcrosses segregating dw and Smst were used to determine whether dw is an allele of Smst. In one backcross, an inbred strain derived from the subspecies Mus musculus molossinus was used to provide a high degree of DNA sequence polymorphism. The gene order and map distances determined on this backcross were: (centromere) - Prm-1 - 7 - Igl-1 - 3 - Smst - 29 - dw - 15 - Sod-1 - 4 - Ets-2, demonstrating clearly that Smst and dw are distinct genes. Additional evidence against a primary role for SS excess in the pathogenesis of dw/dw mice was obtained by injecting normal newborn mice with a potent SS analog (cyclo II). In contrast to the pattern of cell loss observed in the dwarf anterior pituitary, the pituitaries of injected mice were indistinguishable from normal controls, further suggesting that the Smst locus is not the primary site of dw gene action.
Collapse
Affiliation(s)
- B F O'Hara
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | | | | | | | | | | |
Collapse
|
26
|
Barton DE, Kwon BS, Francke U. Human tyrosinase gene, mapped to chromosome 11 (q14----q21), defines second region of homology with mouse chromosome 7. Genomics 1988; 3:17-24. [PMID: 3146546 DOI: 10.1016/0888-7543(88)90153-x] [Citation(s) in RCA: 120] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The enzyme tyrosinase (monophenol,L-dopa:oxygen oxidoreductase; EC 1.14.18.1) catalyzes the first two steps in the conversion of tyrosine to melanin, the major pigment found in melanocytes. Some forms of oculocutaneous albinism, characterized by the absence of melanin in skin and eyes and by a deficiency of tyrosinase activity, may result from mutations in the tyrosinase structural gene. A recently isolated human tyrosinase cDNA was used to map the human tyrosinase locus (TYR) to chromosome 11, region q14----q21, by Southern blot analysis of somatic cell hybrid DNA and by in situ chromosomal hybridization. A second site of tyrosinase-related sequences was detected on the short arm of chromosome 11 near the centromere (p11.2----cen). Furthermore, we have confirmed the localization of the tyrosinase gene in the mouse at or near the c locus on chromosome 7. Comparison of the genetic maps of human chromosome 11 and mouse chromosome 7 leads to hypotheses regarding the evolution of human chromosome 11.
Collapse
Affiliation(s)
- D E Barton
- Department of Human Genetics, Yale University School of Medicine, New Haven, Connecticut 06510
| | | | | |
Collapse
|