2 Origin, Function, and Transmission of Accessory Chromosomes

2020 ◽  
pp. 25-47
Author(s):  
Michael Habig ◽  
Eva H. Stukenbrock
Keyword(s):  
Origin Function ◽  
Accessory Chromosomes

scholarly journals Apicidin biosynthesis is linked to accessory chromosomes in Fusarium poae isolates

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Thomas E. Witte ◽  
Linda J. Harris ◽  
Hai D. T. Nguyen ◽  
Anne Hermans ◽  
Anne Johnston ◽  
...  
Keyword(s):  
Fusarium Head Blight ◽  
Crop Yields ◽  
High Resolution Mass Spectrometry ◽  
Gene Clusters ◽  
Biosynthetic Gene ◽  
Metabolome Analysis ◽  
Head Blight ◽  
Eastern Canada ◽  
Fusarium Poae ◽  
Accessory Chromosomes

Abstract Background Fusarium head blight is a disease of global concern that reduces crop yields and renders grains unfit for consumption due to mycotoxin contamination. Fusarium poae is frequently associated with cereal crops showing symptoms of Fusarium head blight. While previous studies have shown F. poae isolates produce a range of known mycotoxins, including type A and B trichothecenes, fusarins and beauvericin, genomic analysis suggests that this species may have lineage-specific accessory chromosomes with secondary metabolite biosynthetic gene clusters awaiting description. Methods We examined the biosynthetic potential of 38 F. poae isolates from Eastern Canada using a combination of long-read and short-read genome sequencing and untargeted, high resolution mass spectrometry metabolome analysis of extracts from isolates cultured in multiple media conditions. Results A high-quality assembly of isolate DAOMC 252244 (Fp157) contained four core chromosomes as well as seven additional contigs with traits associated with accessory chromosomes. One of the predicted accessory contigs harbours a functional biosynthetic gene cluster containing homologs of all genes associated with the production of apicidins. Metabolomic and genomic analyses confirm apicidins are produced in 4 of the 38 isolates investigated and genomic PCR screening detected the apicidin synthetase gene APS1 in approximately 7% of Eastern Canadian isolates surveyed. Conclusions Apicidin biosynthesis is linked to isolate-specific putative accessory chromosomes in F. poae. The data produced here are an important resource for furthering our understanding of accessory chromosome evolution and the biosynthetic potential of F. poae.

scholarly journals Replication of an rRNA gene origin plasmid in the Tetrahymena thermophila macronucleus is prevented by transcription through the origin from an RNA polymerase I promoter.

1995 ◽  
Vol 15 (6) ◽  
pp. 3372-3381 ◽  
Author(s):  
W J Pan ◽  
R C Gallagher ◽  
E H Blackburn
Keyword(s):  
Rna Polymerase ◽  
Tetrahymena Thermophila ◽  
Rna Polymerase I ◽  
Rrna Gene ◽  
Wild Type ◽  
Independent Evidence ◽  
Origin Region ◽  
Origin Function ◽  
Polymerase I ◽  
Wild Type Promoter

In the somatic macronucleus of the ciliate Tetrahymena thermophila, the palindromic rRNA gene (rDNA) minichromosome is replicated from an origin near the center of the molecule in the 5' nontranscribed spacer. The replication of this rDNA minichromosome is under both cell cycle and copy number control. We addressed the effect on origin function of transcription through this origin region. A construct containing a pair of 1.9-kb tandem direct repeats of the rDNA origin region, containing the origin plus a mutated (+G), but not a wild type, rRNA promoter, is initially maintained in macronuclei as an episome. Late, linear and circular replicons with long arrays of tandem repeats accumulate (W.-J. Pan and E. H. Blackburn, Nucleic Acids Res, in press). We present direct evidence that the +G mutation inactivates this rRNA promoter. It lacks the footprint seen on the wild-type promoter and produces no detectable in vivo transcript. Independent evidence that the failure to maintain wild-type 1.9-kb repeats was caused by transcription through the origin came from placing a short DNA segment containing the rRNA gene transcriptional termination region immediately downstream of the wild-type rRNA promoter. Insertion of this terminator sequence in the correct, but not the inverted, orientation restored plasmid maintenance. Hence, origin function was restored by inactivating the rRNA promoter through the +G mutation or causing termination before transcripts from a wild-type promoter reached the origin region. We propose that transcription by RNA polymerase I through the rDNA origin inhibits replication by preventing replication factors from assembling at the origin.

The origin, function, and diagnostic potential of extracellular microRNAs in human body fluids

2013 ◽  
Vol 5 (2) ◽  
pp. 285-300 ◽  
Author(s):  
Hongwei Liang ◽  
Fei Gong ◽  
Suyang Zhang ◽  
Chen-Yu Zhang ◽  
Ke Zen ◽  
...  
Keyword(s):  
Human Body ◽  
Body Fluids ◽  
Diagnostic Potential ◽  
Origin Function

Root nodule development: origin, function and regulation of nodulin genes

1992 ◽  
Vol 85 (2) ◽  
pp. 253-265 ◽  
Author(s):  
D. P. S. Verma ◽  
C.-A. Hu ◽  
M. Zhang
Keyword(s):  
Root Nodule ◽  
Nodule Development ◽  
Origin Function ◽  
Nodulin Genes

scholarly journals Two Compound Replication Origins in Saccharomyces cerevisiae Contain Redundant Origin Recognition Complex Binding Sites

2001 ◽  
Vol 21 (8) ◽  
pp. 2790-2801 ◽  
Author(s):  
James F. Theis ◽  
Carol S. Newlon
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Dna Replication ◽  
Binding Site ◽  
Binding Sites ◽  
Origin Recognition Complex ◽  
Replication Origins ◽  
Discrete Site ◽  
Origin Function ◽  
Single Binding Site ◽  
Origin Recognition

ABSTRACT While many of the proteins involved in the initiation of DNA replication are conserved between yeasts and metazoans, the structure of the replication origins themselves has appeared to be different. As typified by ARS1, replication origins inSaccharomyces cerevisiae are <150 bp long and have a simple modular structure, consisting of a single binding site for the origin recognition complex, the replication initiator protein, and one or more accessory sequences. DNA replication initiates from a discrete site. While the important sequences are currently less well defined, metazoan origins appear to be different. These origins are large and appear to be composed of multiple, redundant elements, and replication initiates throughout zones as large as 55 kb. In this report, we characterize two S. cerevisiae replication origins, ARS101 and ARS310, which differ from the paradigm. These origins contain multiple, redundant binding sites for the origin recognition complex. Each binding site must be altered to abolish origin function, while the alteration of a single binding site is sufficient to inactivate ARS1. This redundant structure may be similar to that seen in metazoan origins.

Domain B of ARS307 contains two functional elements and contributes to chromosomal replication origin function

1994 ◽  
Vol 14 (11) ◽  
pp. 7652-7659
Author(s):  
J F Theis ◽  
C S Newlon
Keyword(s):  
Replication Origin ◽  
Consensus Sequence ◽  
Functional Elements ◽  
Chromosomal Replication ◽  
Autonomously Replicating Sequence ◽  
Chromosomal Origin ◽  
Highly Active ◽  
Origin Function ◽  
Chromosome Iii ◽  
Replication Activity

ARS307 is highly active as a replication origin in its native location on chromosome III of Saccharomyces cerevisiae. Its ability to confer autonomous replication activity on plasmids requires the presence of an 11-bp autonomously replicating sequence (ARS) consensus sequence (ACS), which is also required for chromosomal origin function, as well as approximately 100 bp of sequence flanking the ACS called domain B. To further define the sequences required for ARS function, a linker substitution mutagenesis of domain B was carried out. The mutations defined two sequences, B1 and B2, that contribute to ARS activity. Therefore, like ARS1, domain B of ARS307 is composed of functional subdomains. Constructs carrying mutations in the B1 element were used to replace the chromosomal copy of ARS307. These mutations caused a reduction in chromosomal origin activity, demonstrating that the B1 element is required for efficient chromosomal origin function.

Sign in / Sign up

Export Citation Format

Share Document