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8.
Nat Genet ; 6(3): 227-35, 1994 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-8012383

RESUMO

A cattle genetic linkage map was constructed which marks about 90% of the expected length of the cattle genome. Over 200 DNA polymorphisms were genotyped in cattle families which comprise 295 individuals in full sibling pedigrees. One hundred and seventy-one loci were found linked to one other locus. Twenty nine of the 30 chromosome pairs are represented by at least one of the 36 linkage groups. Less than a 50 cM difference was found in the male and female genetic maps. The conserved loci on this map show as many differences in gene order compared to humans as is found between humans and mice. The conservation is consistent with the patterns of karyotypic evolution found in the rodents, primates and artiodactyls. This map will be important for localizing quantitative trait loci and provides a basis for further mapping.


Assuntos
Bovinos/genética , Mapeamento Cromossômico , Ligação Genética , Animais , Sequência de Bases , Sequência Conservada , DNA/genética , Primers do DNA/genética , Feminino , Marcadores Genéticos , Humanos , Masculino , Camundongos , Dados de Sequência Molecular , Polimorfismo Genético
19.
Biochem Biophys Res Commun ; 178(3): 1351-8, 1991 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-1908235

RESUMO

CI-972 (2,6-diamino-3,5-dihydro-7-(3-thienylmethyl)-4H-pyrrolo[3,2- d]pyrimidin-4-one monohydrochloride, monohydrate) is a competitive inhibitor of PNPase (E.C. 2.4.2.1., Ki = 0.83 microM) entering clinical trials as a T cell-selective immunosuppressive agent. Neither CI-972 (less than or equal to 50 microM) nor dGuo (less than or equal to 10 microM) inhibited [3H]Thd uptake by human MOLT-4 (T cell) or MGL-8 (B cell) lymphoblasts, but in the presence of 10 microM dGuo, the IC50 for CI-972 decreased to 3.0 microM for MOLT-4 but remained at greater than 50 microM for MGL-8. Inhibition of MOLT-4 growth was associated with an increase in dGTP that was dependent on CI-972 concentration and inhibited by 2'-deoxycytidine. Growth could not be restored by hypoxanthine or adenine. No alterations in GTP pools were noted in MOLT-4, and neither GTP nor dGTP were altered in MGL-8.


Assuntos
Divisão Celular/efeitos dos fármacos , Replicação do DNA/efeitos dos fármacos , Nucleotídeos de Desoxiguanina/metabolismo , Purina-Núcleosídeo Fosforilase/antagonistas & inibidores , Pirimidinas/farmacologia , Tiofenos/farmacologia , Adenina/farmacologia , Desoxicitidina/farmacologia , Guanosina Trifosfato/metabolismo , Humanos , Hipoxantina , Hipoxantinas/farmacologia , Cinética , Leucemia-Linfoma Linfoblástico de Células Precursoras , Linfócitos T
20.
Adv Exp Med Biol ; 309A: 41-4, 1991.
Artigo em Inglês | MEDLINE | ID: mdl-1789255

RESUMO

CI-972 (2,6-diamino-3,5-dihydro-7-(3-thienylmethyl)-4H-pyrrolo[3, 2-d]pyrimidin-4-one monohydrochloride, monohydrate) is a novel inhibitor of PNP (Ki = 0.83 microM) under development as a T cell-selective immunosuppressive agent. CI-972 inhibited proliferation (3H-thymidine uptake) of human MOLT-4 (T cell) but not MGL-8 (B cell) lymphoblasts with respective IC50s of 3.0 and greater than 50 microM when tested with 10 microM 2'-deoxyguanosine. Without addition of exogenous 2'-deoxyguanosine, CI-972 was not inhibitory to any human T or B lymphoblastoid cell line tested. 2'-Deoxycytidine (10 microM), but not hypoxanthine or adenine, restored MOLT-4 cell growth. Inhibition of 3H-thymidine uptake in MOLT-4 cells correlated with accumulation of dGTP, while alterations in guanine nucleotides were not observed. 2'-Deoxycytidine (10 microM) also blocked dGTP accumulation in MOLT-4 cells. CI-972 showed activity in vivo over a broad dose range: At 5-150 mg/kg p.o., CI-972 produced dose-dependent elevation of plasma inosine one hr after administration to rats (mean maximum of 2.62 vs. 0.06 microM in controls). Guanosine was also significantly elevated in a concentration-dependent manner, although the effect was not as impressive. Plasma nucleosides remained statistically-significantly elevated for up to four hr following a single oral dose of CI-972.


Assuntos
Linfócitos/efeitos dos fármacos , Nucleosídeos/sangue , Purina-Núcleosídeo Fosforilase/antagonistas & inibidores , Pirimidinas/farmacologia , Tiofenos/farmacologia , Animais , Linhagem Celular , Células Cultivadas , Nucleotídeos de Desoxiguanina/metabolismo , Guanosina Trifosfato/metabolismo , Humanos , Linfócitos/citologia , Masculino , Ratos , Ratos Endogâmicos , Timidina/metabolismo
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