DNA of AKODON (RODENTIA, CRICETIDAE). II. MOLECULAR HYBRIDIZATION OF REPETITIVE DNA SEQUENCES

Interspecies repetitive DNA homology was studied in akodont rodents related at generic and suprageneric levels. The homology was determined by taking the species Akodon molinae as the reference species. The 3H-DNA/DNA hybridization on filters showed a closer relationship between A. molinae and A. azarae, A. dolores and A. mollis than between A. molinae and Bolomys obscurus. These data agree with the taxonomical ranking of the species. The quantity and quality of the hybrid DNAs were measured by investigating their thermal stabilities and subsequent comparison to the results obtained on the reference species. These data indicate high similitude between the repetitive DNA of A. dolores and A. molinae. Increasing differences were shown to occur in the repetitive DNA of A. mollis, B. obscurus and A. azarae, respectively. Since these results coincide with the G-banding homologies and differ slightly from the taxonomical rank, it is speculated that the divergency between the DNA of A. molinae and A. azarae is the result of a differential process of DNA amplification which is not related to the phylogenetical distance separating the two species.

Download Full-text

Specific A + T-Rich Repetitive DNA-Sequences in Maxicircles from Wildtype Leishmania mexicana Amazonensis and Variants with DNA Amplification

Experimental Parasitology ◽

10.1006/expr.1994.1056 ◽

1994 ◽

Vol 79 (1) ◽

pp. 29-40 ◽

Cited By ~ 11

Author(s):

S.T. Lee ◽

H.Y. Liu ◽

T.Y. Chu ◽

S.Y. Lin

Keyword(s):

Repetitive Dna ◽

Dna Sequences ◽

Dna Amplification ◽

Repetitive Dna Sequences ◽

Leishmania Mexicana

Download Full-text

DNA methylation in satellite repeats disorders

Essays in Biochemistry ◽

10.1042/ebc20190028 ◽

2019 ◽

Vol 63 (6) ◽

pp. 757-771 ◽

Cited By ~ 4

Author(s):

Claire Francastel ◽

Frédérique Magdinier

Keyword(s):

Dna Methylation ◽

Human Genome ◽

Repetitive Dna ◽

Dna Sequences ◽

Satellite Repeats ◽

Tremendous Progress ◽

Genes Encoding ◽

Dna Elements ◽

Near Future

Abstract Despite the tremendous progress made in recent years in assembling the human genome, tandemly repeated DNA elements remain poorly characterized. These sequences account for the vast majority of methylated sites in the human genome and their methylated state is necessary for this repetitive DNA to function properly and to maintain genome integrity. Furthermore, recent advances highlight the emerging role of these sequences in regulating the functions of the human genome and its variability during evolution, among individuals, or in disease susceptibility. In addition, a number of inherited rare diseases are directly linked to the alteration of some of these repetitive DNA sequences, either through changes in the organization or size of the tandem repeat arrays or through mutations in genes encoding chromatin modifiers involved in the epigenetic regulation of these elements. Although largely overlooked so far in the functional annotation of the human genome, satellite elements play key roles in its architectural and topological organization. This includes functions as boundary elements delimitating functional domains or assembly of repressive nuclear compartments, with local or distal impact on gene expression. Thus, the consideration of satellite repeats organization and their associated epigenetic landmarks, including DNA methylation (DNAme), will become unavoidable in the near future to fully decipher human phenotypes and associated diseases.

Download Full-text

Repetitive DNA sequences near three humanβ-type globin genes

Nucleic Acids Research ◽

10.1093/nar/8.15.3319 ◽

1980 ◽

Vol 8 (15) ◽

pp. 3319-3333 ◽

Cited By ~ 24

Author(s):

Lesley W. Coggins ◽

G.Joan Grindlay ◽

J.Keith Vass ◽

Alison A. Slater ◽

Paul Montague ◽

...

Keyword(s):

Repetitive Dna ◽

Dna Sequences ◽

Repetitive Dna Sequences ◽

Globin Genes

Download Full-text

DMSO Improves the Ski-Slope Effect in Direct PCR

Applied Sciences ◽

10.3390/app11041943 ◽

2021 ◽

Vol 11 (4) ◽

pp. 1943

Author(s):

Joo-Young Kim ◽

Ju Yeon Jung ◽

Da-Hye Kim ◽

Seohyun Moon ◽

Won-Hae Lee ◽

...

Keyword(s):

Dna Sequences ◽

Pcr Amplification ◽

Analytical Techniques ◽

Direct Pcr ◽

Dna Profile ◽

Novel Technologies ◽

Specific Amplification ◽

Polymerase Chain ◽

Dna Profiles

Analytical techniques such as DNA profiling are widely used in various fields, including forensic science, and novel technologies such as direct polymerase chain reaction (PCR) amplification are continuously being developed in order to acquire DNA profiles efficiently. However, non-specific amplification may occur depending on the quality of the crime scene evidence and amplification methods employed. In particular, the ski-slope effect observed in direct PCR amplification has led to inaccurate interpretations of the DNA profile results. In this study, we aimed to reduce the ski-slope effect by using dimethyl sulfoxide (DMSO) in direct PCR. We confirmed that DMSO (3.75%, v/v) increased the amplification yield of large-sized DNA sequences more than that of small-sized ones. Using 50 Korean buccal samples, we further demonstrated that DMSO reduced the ski-slope effect in direct PCR. These results suggest that the experimental method developed in this study is suitable for direct PCR and may help to successfully obtain DNA profiles from various types of evidence at crime scenes.

Download Full-text

INDUCTION OF INTRACHROMOSOMAL RECOMBINATION IN YEAST BY INHIBITION OF THYMIDYLATE BIOSYNTHESIS

Genetics ◽

10.1093/genetics/114.2.375 ◽

1986 ◽

Vol 114 (2) ◽

pp. 375-392

Author(s):

B A Kunz ◽

G R Taylor ◽

R H Haynes

Keyword(s):

Gene Conversion ◽

Dna Sequences ◽

Dna Hybridization ◽

Crossing Over ◽

Repeated Dna ◽

Yeast Saccharomyces Cerevisiae ◽

Haploid Strain ◽

Reciprocal Exchange ◽

Coli Plasmid ◽

Antifolate Drugs

ABSTRACT The biosynthesis of thymidylate in the yeast Saccharomyces cerevisiae can be inhibited by antifolate drugs. We have found that antifolate treatment enhances the formation of leucine prototrophs in a haploid strain of yeast carrying, on the same chromosome, two different mutant leu2 alleles separated by Escherichia coli plasmid sequences. That this effect is a consequence of thymine nucleotide depletion was verified by the finding that provision of exogenous thymidylate eliminates the increased production of Leu+ colonies. DNA hybridization analysis revealed that recombination, including reciprocal exchange, gene conversion and unequal sister-chromatid crossing over, between the duplicated genes gave rise to the induced Leu+ segregants. Although gene conversion unaccompanied by crossing over was responsible for the major fraction of leucine prototrophs, events involving reciprocal exchange exhibited the largest increase in frequency. These data show that recombination is induced between directly repeated DNA sequences under conditions of thymine nucleotide depletion. In addition, the results of this and previous studies are consistent with the possibility that inhibition of thymidylate biosynthesis in yeast may create a metabolic condition that provokes all forms of mitotic recombination.

Download Full-text

A Mutation of the Yeast Gene Encoding PCNA Destabilizes Both Microsatellite and Minisatellite DNA Sequences

Genetics ◽

10.1093/genetics/151.2.511 ◽

1999 ◽

Vol 151 (2) ◽

pp. 511-519 ◽

Cited By ~ 4

Author(s):

Robert J Kokoska ◽

Lela Stefanovic ◽

Andrew B Buermeyer ◽

R Michael Liskay ◽

Thomas D Petes

Keyword(s):

Dna Polymerase ◽

Repetitive Dna ◽

Dna Sequences ◽

Repeat Unit ◽

Nuclear Antigen ◽

Temperature Sensitive ◽

Dinucleotide Repeats ◽

Yeast Saccharomyces Cerevisiae ◽

Dna Polymerase Δ ◽

Repeat Units

AbstractThe POL30 gene of the yeast Saccharomyces cerevisiae encodes the proliferating cell nuclear antigen (PCNA), a protein required for processive DNA synthesis by DNA polymerase δ and ϵ. We examined the effects of the pol30-52 mutation on the stability of microsatellite (1- to 8-bp repeat units) and minisatellite (20-bp repeat units) DNA sequences. It had previously been shown that this mutation destabilizes dinucleotide repeats 150-fold and that this effect is primarily due to defects in DNA mismatch repair. From our analysis of the effects of pol30-52 on classes of repetitive DNA with longer repeat unit lengths, we conclude that this mutation may also elevate the rate of DNA polymerase slippage. The effect of pol30-52 on tracts of repetitive DNA with large repeat unit lengths was similar, but not identical, to that observed previously for pol3-t, a temperature-sensitive mutation affecting DNA polymerase δ. Strains with both pol30-52 and pol3-t mutations grew extremely slowly and had minisatellite mutation rates considerably greater than those observed in either single mutant strain.

Download Full-text