ISSN:0265-9247    

DOI:10.1002/bies.950010502

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractRecent studies have shown that some maternal mRNAs are localized in specific cytoplasmic regions of eggs and embryos and are rearranged in concert with the cytoplasmic movements that fix the embryonic axes. The localization and ooplasmic segregation of mRNA molecules may be mediated by their association with specific egg cytoskeletal domains.

ISSN:0265-9247    

DOI:10.1002/bies.950010503

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe majority of higher plants (including almost all important crops) demonstrate strict uniparental maternal inheritance of plasmagenes in the process of conventional sexual crossing; it is therefore impossible to generate heterozygosity for these genes with standard crossing procedures. However, recent experiments have shown that hybrid plants can be produced by somatic cell fusion and that these contain the cytoplasmic genes of both parents. The phenotypic and genetic properties of these hybrid plants are described here.

ISSN:0265-9247    

DOI:10.1002/bies.950010504

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThere is now a wealth of information that histone proteins play a primary role in the structural and transcriptional properties of chromatin, the protein‐DNA complex which constitutes the eukaryotic genome1, 2. In light of the crucial role of histones in cellular function, it is not surprising that their structural genes are found to be controlled in conjunction with the cell cycle, with the synthesis of most histones tightly coupled to nuclear DNA replication. The evidence suggests that this linkage between DNA replication and histone synthesis involves the regulated adjustment of histone mRNA levels through both transcriptional and posttranscriptional control process. The possible mechanisms underlying these diverse control processes are described her

ISSN:0265-9247    

DOI:10.1002/bies.950010505

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe synthesis and integration of DNA into the genome of its host cell is a normal step in the replication of the retroviruses. Previous studies have provided details concerning the structure of viral DNA and viral and host integration sites. More recent genetic and biochemical results have expanded our understanding considerably: it should soon be possible to describe the exact viral DNA sequence recognized during the integration reaction for several viruses. In addition, at least one of the viral proteins and enzymatic activities required in the reaction has been identified. Analysis of this apparently efficient and highly specific site‐directed recombination event in eukaryotic cells promises to provide insights of both fundamental and practical interes

ISSN:0265-9247    

DOI:10.1002/bies.950010506

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractFoetal neurones transplanted within the adult mammalian central nervous system survive and differentiate. Study of such transplants has yielded insights into the function, development and plasticity of brain structures, and suggests promising new therapies for a number of neurological disorders.

ISSN:0265-9247    

DOI:10.1002/bies.950010507

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe heat shock genes (hsp genes) are a family of truly ubiquitous genes which have been highly conserved throughout evolution. The protein products of these genes, the heat shock proteins (hsps) are thought to play a protective role in cells (although this may not be their only function). The genes and their products have been the subjects of intense research both at the cellular and molecular levels over the past few years. This review deals with the conservation of the heat shock response and with the expression of the hsp genes under different conditions: they are usually activated as a group by different forms of stress, but can be expressed individually or in subsets at different stages during normal development and the expression of one of them is evoked by the products of different transforming genes. Experimental approaches which have provided information or which have led to hypotheses regarding the molecular details of the mechanisms regulating the expression of the genes are discussed.

ISSN:0265-9247    

DOI:10.1002/bies.950010508

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractSingle‐stranded DNA binding proteins have been known for some time to be crucial in many DNA metabolic reactions in both prokaryotes and eukaryotes. Despite a wealth of studies on these proteins we still do not understand their biochemical mechanism of action. Recent studies of the Escherichia coli single stranded DNA binding protein (SSB) are beginning to provide some insight into how this and similar proteins might functio

ISSN:0265-9247    

DOI:10.1002/bies.950010509

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractAlthough female and male gametes are presumably equivalent in their genetic contribution to embryos, they carry specific information, perhaps reversibly imprinted into the genomes during oogenesis and spermatogenesis, as to their maternal or paternal origin. This information is crucial for embryogenesis and, in the absence of at least one haploid set of chromosomes from each parent, embryos do not develop to term. The paternal genome is probably required for proliferation of extraembryonic tissues and the maternal genome for some stages of embryogeneis. Furthermore, the effects of certain mutations are determined by the paternal or maternal origin of the inheritance.

ISSN:0265-9247    

DOI:10.1002/bies.950010510

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0265-9247    

DOI:10.1002/bies.950010511

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY