Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology最新文献_第8页

The localization of ribosomal DNA in Sciaridae (Diptera: Nematocera) reassessed. 核糖体DNA定位的蚊科(双翅目:线虫目)重新评估。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-01-21 DOI: 10.1007/s10577-007-1127-0

Christiane Rodriguez Gutierrez Madalena, José Mariano Amabis, Ann Jacob Stocker, Eduardo Gorab

{"title":"The localization of ribosomal DNA in Sciaridae (Diptera: Nematocera) reassessed.","authors":"Christiane Rodriguez Gutierrez Madalena, José Mariano Amabis, Ann Jacob Stocker, Eduardo Gorab","doi":"10.1007/s10577-007-1127-0","DOIUrl":"https://doi.org/10.1007/s10577-007-1127-0","url":null,"abstract":"The chromosomal localization of ribosomal DNA (rDNA) was studied in polytene and diploid tissues of four sciarid species, Trichosia pubescens, Rhynchosciara americana, R. milleri and Schwenkfeldina sp. While hybridization to mitotic chromosomes showed the existence of a single rDNA locus, ribosomal probes hybridized to more than one polytene chromosome region in all the species analyzed as a result of micronucleolar attachment to specific chromosome sites. Micronucleoli are small, round bodies containing transcriptionally active, probably extrachromosomal rDNA. In T. pubescens the rDNA is predominantly localized in chromosome sections X-10 and X-8. In R. americana the rDNA is frequently found associated with centromeric heterochromatin of the chromosomes X, C, B and A, and also with sections X-1 and B-13. Ribosomal probes in R. milleri hybridized with high frequency to pericentric and telomeric regions of its polytene complement. Schwfenkfeldina sp. displays a remarkably unusual distribution of rDNA in polytene nuclei, characterized by the attachment of micronucleoli to many chromosome regions. The results showed that micronucleoli preferentially associate with intercalary or terminal heterochromatin of all sciarid flies analyzed and, depending on the species, are attached to a few (Trichosia), moderate (Rhynchosciara) or a large (Schwenkfeldina sp.) number of polytene chromosome sites.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"409-16"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1127-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"26608557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Karyotype evolution in Rhinolophus bats (Rhinolophidae, Chiroptera) illuminated by cross-species chromosome painting and G-banding comparison. 跨种染色体绘制和g带比较揭示了鼻蝠(鼻蝠科，翼目)的核型进化。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-10-01 DOI: 10.1007/s10577-007-1167-5

Xiuguang Mao, Wenhui Nie, Jinhuan Wang, Weiting Su, Lei Ao, Qing Feng, Yingxiang Wang, Marianne Volleth, Fengtang Yang

{"title":"Karyotype evolution in Rhinolophus bats (Rhinolophidae, Chiroptera) illuminated by cross-species chromosome painting and G-banding comparison.","authors":"Xiuguang Mao, Wenhui Nie, Jinhuan Wang, Weiting Su, Lei Ao, Qing Feng, Yingxiang Wang, Marianne Volleth, Fengtang Yang","doi":"10.1007/s10577-007-1167-5","DOIUrl":"https://doi.org/10.1007/s10577-007-1167-5","url":null,"abstract":"Rhinolophus (Rhinolophidae) is the second most speciose genus in Chiroptera and has extensively diversified diploid chromosome numbers (from 2n = 28 to 62). In spite of many attempts to explore the karyotypic evolution of this genus, most studies have been based on conventional Giemsa staining rather than G-banding. Here we have made a whole set of chromosome-specific painting probes from flow-sorted chromosomes of Aselliscus stoliczkanus (Hipposideridae). These probes have been utilized to establish the first genome-wide homology maps among six Rhinolophus species with four different diploid chromosome numbers (2n = 36, 44, 58, and 62) and three species from other families: Rousettus leschenaulti (2n = 36, Pteropodidae), Hipposideros larvatus (2n = 32, Hipposideridae), and Myotis altarium (2n = 44, Vespertilionidae) by fluorescence in situ hybridization. To facilitate integration with published maps, human paints were also hybridized to A. stoliczkanus chromosomes. Our painting results substantiate the wide occurrence of whole-chromosome arm conservation in Rhinolophus bats and suggest that Robertsonian translocations of different combinations account for their karyotype differences. Parsimony analysis using chromosomal characters has provided some new insights into the Rhinolophus ancestral karyotype and phylogenetic relationships among these Rhinolophus species so far studied. In addition to Robertsonian translocations, our results suggest that whole-arm (reciprocal) translocations involving multiple non-homologous chromosomes as well could have been involved in the karyotypic evolution within Rhinolophus, in particular those bats with low and medium diploid numbers.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"835-48"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1167-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41065344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 42

The DNA-repair Ku70 protein is located in the nucleus and tail of elongating spermatids in grasshoppers. dna修复蛋白Ku70位于蝗虫伸长精细胞的细胞核和尾部。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-11-06 DOI: 10.1007/s10577-007-1183-5

Josefa Cabrero, Rogelio J Palomino-Morales, Juan Pedro M Camacho

{"title":"The DNA-repair Ku70 protein is located in the nucleus and tail of elongating spermatids in grasshoppers.","authors":"Josefa Cabrero, Rogelio J Palomino-Morales, Juan Pedro M Camacho","doi":"10.1007/s10577-007-1183-5","DOIUrl":"https://doi.org/10.1007/s10577-007-1183-5","url":null,"abstract":"Fluorescence immunostaining for the phosphorylated H2AX histone (gammaH2AX) in the grasshopper Eyprepocnemis plorans has shown abundance of gammaH2AX in the nuclei of round and elongating spermatids, suggesting that DNA double-strand breaks (DSBs) occur regularly during spermiogenesis. Immunofluorescence patterns for Ku70, a DNA-repair protein participating in the non-homologous end-joining (NHEJ) pathway, showed that this protein is present in round and elongating spermatids, implying that the NHEJ DNA-repair pathway operates during chromatin compaction in spermiogenesis. In addition, during the final stages of spermiogenesis, the Ku70 protein concentrates on the region forming the sperm tail. Since Ku70 was also abundant in spermatid tails, it is reasonable to assume that Ku70 might play a novel function in sperm-tail formation. The analysis of Ku70 immunofluorescence patterns in 13 other grasshopper species also showed the presence of this protein in the nucleus and tail of elongating spermatids, indicating that this is a general characteristic in grasshoppers.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"1093-100"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1183-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41056992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Chromatin structure of ribosomal genes in Chironomus thummi (Diptera: Chironomidae): tissue specificity and behaviour under drug treatment. 土爪手蛾核糖体基因的染色质结构:药物治疗下的组织特异性和行为。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-05-15 DOI: 10.1007/s10577-007-1134-1

Cristina Sanz, Eduardo Gorab, Maria Fernanda Ruiz, José Manuel Sogo, José Luís Díez

{"title":"Chromatin structure of ribosomal genes in Chironomus thummi (Diptera: Chironomidae): tissue specificity and behaviour under drug treatment.","authors":"Cristina Sanz, Eduardo Gorab, Maria Fernanda Ruiz, José Manuel Sogo, José Luís Díez","doi":"10.1007/s10577-007-1134-1","DOIUrl":"https://doi.org/10.1007/s10577-007-1134-1","url":null,"abstract":"In eukaryotes the ribosomal gene population shows two different states in terms of chromatin structure. One subset is organized as nucleosomes (silent copies) while the other has a non-nucleosomal configuration (active copies). Insect cells are not the exception and this bimodal distribution of ribosomal chromatin also occurs in salivary gland cells, and cells of other larval tissues, of the midge Chironomus thummi. In run-on experiments on salivary glands cells we confirmed that transcribed rRNA genes show a non-nucleosomal configuration. The proportion of rRNA genes adopting an open, non-nucleosomal configuration was found to be tissue-dependent, suggesting that the population of unfolded ribosomal chromatin in C. thummi was established during cell differentiation. We propose that cell differentiation determines the fraction of non-nucleosomal rRNA gene copies and thus defines the range of possible rRNA synthesis rates in a particular cell type. In the salivary gland the fraction of unfolded chromatin was not significantly affected when transcription was repressed. However, transcription activation by pilocarpine led to a moderate increase in this fraction. These findings indicate that, in addition to a possible increase in the number of RNA-polymerases per transcribing rDNA unit, the proportion of transcribed ribosomal genes in differentiated cells can be modulated in response to an exceptional rRNA synthesis requirement.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"429-38"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1134-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"26710779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Chromosomal evolution of Arvicolinae (Cricetidae, Rodentia). I. The genome homology of tundra vole, field vole, mouse and golden hamster revealed by comparative chromosome painting. 田鼠科的染色体进化。1 .比较染色体绘画揭示的冻原田鼠、田鼠、小鼠和金仓鼠基因组同源性。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-05-11 DOI: 10.1007/s10577-007-1137-y

Natalia A Sitnikova, Svetlana A Romanenko, Patricia C M O'Brien, Polina L Perelman, Beiyuan Fu, Nadezhda V Rubtsova, Natalya A Serdukova, Feodor N Golenishchev, Vladimir A Trifonov, Malcolm A Ferguson-Smith, Fengtang Yang, Alexander S Graphodatsky

{"title":"Chromosomal evolution of Arvicolinae (Cricetidae, Rodentia). I. The genome homology of tundra vole, field vole, mouse and golden hamster revealed by comparative chromosome painting.","authors":"Natalia A Sitnikova, Svetlana A Romanenko, Patricia C M O'Brien, Polina L Perelman, Beiyuan Fu, Nadezhda V Rubtsova, Natalya A Serdukova, Feodor N Golenishchev, Vladimir A Trifonov, Malcolm A Ferguson-Smith, Fengtang Yang, Alexander S Graphodatsky","doi":"10.1007/s10577-007-1137-y","DOIUrl":"https://doi.org/10.1007/s10577-007-1137-y","url":null,"abstract":"Cross-species chromosome painting has become the mainstay of comparative cytogenetic and chromosome evolution studies. Here we have made a set of chromosomal painting probes for the field vole (Microtus agrestis) by DOP-PCR amplification of flow-sorted chromosomes. Together with painting probes of golden hamster (Mesocricetus auratus) and mouse (Mus musculus), the field vole probes have been hybridized onto the metaphases of the tundra vole (Microtus oeconomus). A comparative chromosome map between these two voles, golden hamster and mouse has been established based on the results of cross-species chromosome painting and G-banding comparisons. The sets of paints from the field vole, golden hamster and mouse identified a total of 27, 40 and 47 homologous autosomal regions, respectively, in the genome of tundra vole; 16, 41 and 51 fusion/fission rearrangements differentiate the karyotype of the tundra vole from the karyotypes of the field vole, golden hamster and mouse, respectively.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"447-56"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1137-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"26719108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 51

Chromosome neighborhood composition determines translocation outcomes after exposure to high-dose radiation in primary cells. 染色体邻域组成决定了原代细胞暴露于高剂量辐射后易位的结果。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-11-06 DOI: 10.1007/s10577-007-1181-7

Lura Brianna Caddle, Jeremy L Grant, Jin Szatkiewicz, Johann van Hase, Bobbi-Jo Shirley, Joerg Bewersdorf, Christoph Cremer, Alain Arneodo, Andre Khalil, Kevin D Mills

{"title":"Chromosome neighborhood composition determines translocation outcomes after exposure to high-dose radiation in primary cells.","authors":"Lura Brianna Caddle, Jeremy L Grant, Jin Szatkiewicz, Johann van Hase, Bobbi-Jo Shirley, Joerg Bewersdorf, Christoph Cremer, Alain Arneodo, Andre Khalil, Kevin D Mills","doi":"10.1007/s10577-007-1181-7","DOIUrl":"https://doi.org/10.1007/s10577-007-1181-7","url":null,"abstract":"Radiation exposure is an occupational hazard for military personnel, some health care professionals, airport security screeners, and medical patients, with some individuals at risk for acute, high-dose exposures. Therefore, the biological effects of radiation, especially the potential for chromosome damage, are major occupational and health concerns. However, the biophysical mechanisms of chromosome instability subsequent to radiation-induced DNA damage are poorly understood. It is clear that interphase chromosomes occupy discrete structural and functional subnuclear domains, termed chromosome territories (CT), which may be organized into 'neighborhoods' comprising groups of specific CTs. We directly evaluated the relationship between chromosome positioning, neighborhood composition, and translocation partner choice in primary lymphocytes, using a cell-based system in which we could induce multiple, concentrated DNA breaks via high-dose irradiation. We critically evaluated mis-rejoining profiles and tested whether breaks occurring nearby were more likely to fuse than breaks occurring at a distance. We show that CT neighborhoods comprise heterologous chromosomes, within which inter-CT distances directly relate to translocation partner choice. These findings demonstrate that interphase chromosome arrangement is a principal factor in genomic instability outcomes in primary lymphocytes, providing a structural context for understanding the biological effects of radiation exposure, and the molecular etiology of tumor-specific translocation patterns.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"1061-73"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1181-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41056993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 55

Comparative chromosome painting map between two Ryukyu spiny rat species, Tokudaia osimensis and Tokudaia tokunoshimensis (Muridae, Rodentia). 两种琉球棘鼠Tokudaia osimensis和Tokudaia tokunoshimensis(鼠科)染色体绘制比较图。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-08-23 DOI: 10.1007/s10577-007-1163-9

Taro Nakamura, Asato Kuroiwa, Chizuko Nishida-Umehara, Kazumi Matsubara, Fumio Yamada, Yoichi Matsuda

{"title":"Comparative chromosome painting map between two Ryukyu spiny rat species, Tokudaia osimensis and Tokudaia tokunoshimensis (Muridae, Rodentia).","authors":"Taro Nakamura, Asato Kuroiwa, Chizuko Nishida-Umehara, Kazumi Matsubara, Fumio Yamada, Yoichi Matsuda","doi":"10.1007/s10577-007-1163-9","DOIUrl":"https://doi.org/10.1007/s10577-007-1163-9","url":null,"abstract":"Ryukyu spiny rats (genus Tokudaia) are indigenous species that are confined to three islands of the Nansei Shoto archipelago, Amami-Oshima, Tokunoshima and Okinawa-jima, Japan. Tokudaia tokunoshimensis from Tokunoshima Island and Tokudaia osimensis from Amami-Oshima Island are closely related taxonomically, although their karyotypes are quite different: the diploid chromosome numbers and sex chromosome constitution are 2n=45, X0/X0 for T. tokunoshimensis and 2n=25, X0/X0 for T. osimensis. We conducted comparative chromosome painting with chromosome-specific DNA probes of the laboratory mouse (Mus musculus) to molecularly examine the chromosome homology between T. tokunoshimensis and T. osimensis, and deduced a possible ancestral karyotype of Tokudaia species and the process of evolutionary chromosome rearrangements. The proposed ancestral karyotype with the diploid number of 2n=48, XX/XY was similar to the karyotype of T. tokunoshimensis, and the karyotype of T. osimensis would then have been established through at least 14 chromosomal changes, mainly centric fusion and tandem fusion, from the ancestral karyotype. The close karyological relationship between the ancestral karyotypes of Tokudaia and Apodemus also suggests that the chromosomal evolution in the Tokudaia-Apodemus lineage has been very slow and has accelerated only recently in the branch leading to T. osimensis.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"799-806"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1163-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40977727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Nucleolus and chromosome relationships at pachynema in four Scarabaeoidea (Coleoptera) species with various combinations of NOR and sex chromosomes. 四种不同NOR和性染色体组合的金龟子总科(鞘翅目)种厚膜的核仁和染色体关系。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-04-05 DOI: 10.1007/s10577-007-1133-2

A M Dutrillaux, H Xie, B Dutrillaux

{"title":"Nucleolus and chromosome relationships at pachynema in four Scarabaeoidea (Coleoptera) species with various combinations of NOR and sex chromosomes.","authors":"A M Dutrillaux, H Xie, B Dutrillaux","doi":"10.1007/s10577-007-1133-2","DOIUrl":"https://doi.org/10.1007/s10577-007-1133-2","url":null,"abstract":"Nucleolus organizer regions (NORs) and nucleolus locations were studied after silver staining in spermatocytes at pachynema from four beetle species selected for their various combinations of sex chromosomes. Their karyotypic formulae were: 18,neoXY (Dorcus parallelipipedus); 25,X (Passalus unicornis) and 20,Xyp (Cetonia aurata and Protaecia (Potosia) opaca). NORs were located in the short arms of a unique acrocentric autosome pair in the first three and in intercalary position in a sub-metacentric autosome pair in the last species. Silver staining gave remarkably more consistent results in pachytene than in mitotic spreads, enabling the detection of both NORs and nucleoli, and also better results in embryo than in spermatogonial metaphases. At pachynema the NORs were elongated, roughly in proportion to the number of nucleoli, which always remained associated with NOR. Nucleoli were not recurrently associated with sex chromosomes, except in P. unicornis, at late pachynema. In C. aurata and P. opaca the sex body was recurrently associated with acrocentric short arms and metacentric telomeres, respectively. Even in these simple situations, with NORs located in a single autosome pair, the number of nucleoli and their relationships with sex chromosomes varied strongly from species to species. These variations appear to be largely determined by the chromosome rearrangements which have occurred during evolution, which makes extrapolations and generalizations quite hazardous. In D. parallelipipedus pachytene cells a quasi-systematic and transient fusion between the terminal heterochromatin of two sub-metacentrics was detected. Other chromosome bivalents could also be occasionally associated, but not the NOR carrier one. A strong enhancement of DAPI or quinacrine mustard staining was observed at the fusion point.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"417-27"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1133-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"26243403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Complex rearrangements are involved in Cephalanthera (Orchidaceae) chromosome evolution. 头兰属植物的染色体进化涉及复杂的重排。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-11-09 DOI: 10.1007/s10577-007-1174-6

Eduardo A Moscone, Rosabelle Samuel, Trude Schwarzacher, Dieter Schweizer, Andrea Pedrosa-Harand

{"title":"Complex rearrangements are involved in Cephalanthera (Orchidaceae) chromosome evolution.","authors":"Eduardo A Moscone, Rosabelle Samuel, Trude Schwarzacher, Dieter Schweizer, Andrea Pedrosa-Harand","doi":"10.1007/s10577-007-1174-6","DOIUrl":"https://doi.org/10.1007/s10577-007-1174-6","url":null,"abstract":"The genus Cephalanthera is an excellent plant group for karyotype evolution studies because it exhibits a dysploid series and bimodal karyotypes. With the aim of understanding their chromosomal and phylogenetic relationships, rRNA genes and the Arabidopsis-type telomeric sequence were mapped by fluorescence in-situ hybridization (FISH), and the rDNA intergenic spacer (ITS) was sequenced for the first time in three European species: C. longifolia (2n = 4x = 32), C. damasonium (2n = 4x = 36) and C. rubra (2n = 4x = 44). One 45S and three 5S rDNA sites are observed in C. longifolia, one 45S and two 5S sites in C. damasonium, and two 45S and one 5S site in C. rubra. Telomeric signals were observed at every chromosome end in all three species and C. damasonium also displays interstitial signals on three chromosome pairs. In agreement with chromosome data, molecular analyses support C. longifolia and C. damasonium as closely related taxa, while C. rubra stands apart. Possible pathways of karyotype evolution are discussed in reference to a previous hypothesis. The results indicate that complex chromosomal rearrangements, possibly involving Robertsonian fusions and fissions, loss of telomeric repeats, gain or loss of rDNA sites and other heterochromatic sequences and inversions, may have contributed to generating the present-day karyotypes.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"931-43"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-007-1174-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41021914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 39

Accumulation of rare sex chromosome rearrangements in the African pygmy mouse, Mus (Nannomys) minutoides: a whole-arm reciprocal translocation (WART) involving an X-autosome fusion. 非洲侏儒鼠(Mus (nanomys) minutoides)罕见性染色体重排的积累:涉及x常染色体融合的全臂互惠易位(WART)。

IF 2.6

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology Pub Date : 2007-01-01 Epub Date: 2007-02-05 DOI: 10.1007/s10577-006-1116-8

Frédéric Veyrunes, Johan Watson, Terence J Robinson, Janice Britton-Davidian

{"title":"Accumulation of rare sex chromosome rearrangements in the African pygmy mouse, Mus (Nannomys) minutoides: a whole-arm reciprocal translocation (WART) involving an X-autosome fusion.","authors":"Frédéric Veyrunes, Johan Watson, Terence J Robinson, Janice Britton-Davidian","doi":"10.1007/s10577-006-1116-8","DOIUrl":"https://doi.org/10.1007/s10577-006-1116-8","url":null,"abstract":"Although sex chromosomes are generally the most conserved elements of the mammalian karyotype, those of African pygmy mice show three extraordinary deviations from the norm: (a) asynaptic sex chromosomes, (b) multiple sex-autosome fusions, and (c) modifications of sex determination in some populations/species. In this study we identified, in two sex-reversed females of Mus (Nannomys) minutoides, a fourth rare sex chromosome change: a spontaneous whole-arm reciprocal translocation (WART) between an autosomal Robertsonian pair Rb(13.16) and the sex-autosome fusion Rb(X.1). This represents one of the very few reported cases of WARTs in natura within mammals, and is the first one to involve sex chromosomes. Hence, this finding offers new insights into the mechanisms of chromosomal differentiation in African pygmy mice, as WARTs may have contributed to the extensive diversity not only of autosomal Robertsonian fusions, but also of sex-autosome translocations. More widely, these results provide additional support to previous studies on the house mouse and the common shrew which indirectly inferred the role of WARTs in their karyotypic evolution, and may even help to understand how the fascinating 10 sex chromosome chain of the platypus might have evolved. This accumulation of rare sex chromosome changes in single specimens is, to our knowledge, exceptional among mammals.","PeriodicalId":347802,"journal":{"name":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","volume":" ","pages":"223-30"},"PeriodicalIF":2.6,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10577-006-1116-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"26595615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 23