scholarly journals Genetic Characterizations and Molecular Evolution of the Measles Virus Genotype B3’s Hemagglutinin (H) Gene in the Elimination Era

Viruses ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1970
Author(s):  
Nan Zhou ◽  
Mingma Li ◽  
Yue Huang ◽  
Lu Zhou ◽  
Bei Wang
Keyword(s):  
Positive Selection ◽  
Substitution Rate ◽  
Measles Virus ◽  
Selection Pressure ◽  
Genotypic Diversity ◽  
Nucleotide Substitution Rate ◽  
Effective Population ◽  
Virus Genotype ◽  
Slowing Down ◽  
H Gene

Measles virus (MeV) genotype B3 is one globally significant circulating genotype. Here, we present a systematic description of long-term evolutionary characterizations of the MeV genotype B3’s hemagglutinin (H) gene in the elimination era. Our results show that the B3 H gene can be divided into two main sub-genotypes, and the highest intra-genotypic diversity was observed in 2004. MeV genotype B3’s H gene diverged in 1976; its overall nucleotide substitution rate is estimated to be 5.697 × 10−4 substitutions/site/year, and is slowing down. The amino acid substitution rate of genotype B3’s H gene is also decreasing, and the mean effective population size has been in a downward trend since 2000. Selection pressure analysis only recognized a few sites under positive selection, and the number of positive selection sites is getting smaller. All of these observations may reveal that genotype B3’s H gene is not under strong selection pressure, and is becoming increasingly conservative. MeV H-gene or whole-genome sequencing should be routine, so as to better elucidate the molecular epidemiology of MeV in the future.

scholarly journals Measles virus genotype D4 strains with non-standard length M-F non-coding region circulated during the major outbreaks of 2011-2012 in Spain

PLoS ONE ◽  
2018 ◽  
Vol 13 (7) ◽  
pp. e0199975 ◽  
Author(s):  
Horacio Gil ◽  
Aurora Fernández-García ◽  
María Mar Mosquera ◽  
Judith M. Hübschen ◽  
Ana M. Castellanos ◽  
...  
Keyword(s):  
Standard Length ◽  
Measles Virus ◽  
Coding Region ◽  
Virus Genotype

scholarly journals Genetic Analysis of the Measles Virus From the Outbreaks in South Korea, 2019

2021 ◽  
Vol 12 ◽  
Author(s):  
Jeong-Min Kim ◽  
Sehee Park ◽  
Sujin Kim ◽  
Kye Ryeong Park ◽  
Jin-Sook Wang ◽  
...  
Keyword(s):  
Health Care ◽  
Genetic Analysis ◽  
Health Care Workers ◽  
Measles Virus ◽  
Genetic Characteristics ◽  
Phylogenetic Clustering ◽  
Care Workers ◽  
H Gene ◽  
Measles Outbreaks ◽  
Clustering Patterns

Three genotypes (B3, D8, and H1) of the measles virus (MeV) have recently caused global outbreaks. In Korea, four measles outbreaks were reported during 2018–2019 and most patients were infants and health care workers in their 20s and 30s. To investigate the genetic characteristics and molecular epidemiology of the outbreaks, we analyzed the sequence of MeVs by targeting the N-450, MF-NCR, and/or H gene regions. Considering their phylogenetic relationships, besides the N-450 and MF-NCR sequences that are commonly used for genotyping MeVs, the MF-NCR-H sequence was related to the dynamics for identifying the transmission of MeVs. Phylogenetic clustering patterns reconstructed from the MF-NCR-H sequence set revealed that genotype D8 caused three of the four outbreaks, while B3 seemed to have induced the fourth outbreak. These results suggest that the MF-NCR-H sequence is useful for rapid confirmation of measles outbreaks and to identify the epidemiological routes of MeVs.

scholarly journals Complete Genome Sequences of Measles Virus Genotype D8 Isolates from South Korea in 2016

2019 ◽  
Vol 8 (29) ◽  
Author(s):  
You-Jin Kim ◽  
Hae Ji Kang ◽  
Su-Jin Kim ◽  
Hye Min Lee ◽  
Sung Soon Kim
Keyword(s):  
Genetic Diversity ◽  
South Korea ◽  
Complete Genome ◽  
Measles Virus ◽  
Virus Transmission ◽  
Wild Type ◽  
Genome Sequences ◽  
Virus Genotype

The complete genome sequences of three wild-type measles viruses (genotype D8) isolated from patients in South Korea were determined. These are the first reported complete genome sequences of measles viruses obtained from South Korea, and the availability of these sequences will improve our understanding of measles virus transmission and genetic diversity.

scholarly journals Variation in selection constraints on teleost TLRs with emphasis on their repertoire in the Walking catfish, Clarias batrachus

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Manisha Priyam ◽  
Sanjay K. Gupta ◽  
Biplab Sarkar ◽  
T. R. Sharma ◽  
A. Pattanayak
Keyword(s):  
Phylogenetic Analysis ◽  
Positive Selection ◽  
Strong Evidence ◽  
Selection Pressure ◽  
Arms Race ◽  
Clarias Batrachus ◽  
Toll Like Receptors ◽  
Specific Variation ◽  
Species Specific ◽  
High Degree

AbstractThe high degree of conservation of toll-like receptors (TLRs), and yet their subtle variations for better adaptation of species in the host–pathogen arms race make them worthy candidates for understanding evolution. We have attempted to track the trend of TLR evolution in the most diverse vertebrate group—teleosts, where Clarias batrachus was given emphasis, considering its traits for terrestrial adaptation. Eleven C. batrachus TLRs (TLR1, 2, 3, 5, 7, 8 9, 13, 22, 25, 26) were identified in this study which clustered in proximity to its Siluriformes relative orthologues in the phylogenetic analysis of 228 TLRs from 25 teleosts. Ten TLRs (TLR1, 2, 3, 5, 7, 8 9, 13, 21, 22) with at least 15 member orthologues for each alignment were processed for selection pressure and coevolutionary analysis. TLR1, 7, 8 and 9 were found to be under positive selection in the alignment-wide test. TLR1 also showed maximum episodic diversification in its clades while the teleost group Eupercaria showed the maximum divergence in their TLR repertoire. Episodic diversification was evident in C. batrachus TLR1 and 7 alignments. These results present a strong evidence of a divergent TLR repertoire in teleosts which may be contributing towards species-specific variation in TLR functions.

Genetic characterization of measles virus genotype D6 subacute sclerosing panencephalitis case, Alberta, Canada

2018 ◽  
Vol 24 (6) ◽  
pp. 720-729 ◽  
Author(s):  
K. Pabbaraju ◽  
K. Fonseca ◽  
S. Wong ◽  
M. W. Koch ◽  
J. T. Joseph ◽  
...  
Keyword(s):  
Measles Virus ◽  
Genetic Characterization ◽  
Subacute Sclerosing Panencephalitis ◽  
Virus Genotype

scholarly journals Genome-Wide Runs of Homozygosity, Effective Population Size, and Detection of Positive Selection Signatures in Six Chinese Goat Breeds

Genes ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 938 ◽  
Author(s):  
Islam ◽  
Li ◽  
Liu ◽  
Berihulay ◽  
Abied ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Differentiation ◽  
Positive Selection ◽  
Candidate Genes ◽  
Runs Of Homozygosity ◽  
Selection Signatures ◽  
Effective Population ◽  
Signature Of Selection ◽  
Genomic Regions ◽  
Insight Into

: Detection of selection footprints provides insight into the evolution process and the underlying mechanisms controlling the phenotypic diversity of traits that have been exposed to selection. Selection focused on certain characters, mapping certain genomic regions often shows a loss of genetic diversity with an increased level of homozygosity. Therefore, the runs of homozygosity (ROHs), homozygosity by descent (HBD), and effective population size (Ne) are effective tools for exploring the genetic diversity, understanding the demographic history, foretelling the signature of directional selection, and improving the breeding strategies to use and conserve genetic resources. We characterized the ROH, HBD, Ne, and signature of selection of six Chinese goat populations using single nucleotide polymorphism (SNP) 50K Illumina beadchips. Our results show an inverse relationship between the length and frequency of ROH. A long ROH length, higher level of inbreeding, long HBD segment, and smaller Ne in Guangfeng (GF) goats suggested intensive selection pressure and recent inbreeding in this breed. We identified six reproduction-related genes within the genomic regions with a high ROH frequency, of which two genes overlapped with a putative selection signature. The estimated pair-wise genetic differentiation (FST) among the populations is 9.60% and the inter- and intra-population molecular variations are 9.68% and 89.6%, respectively, indicating low to moderate genetic differentiation. Our selection signatures analysis revealed 54 loci harboring 86 putative candidate genes, with a strong signature of selection. Further analysis showed that several candidate genes, including MARF1, SYCP2, TMEM200C, SF1, ADCY1, and BMP5, are involved in goat fecundity. We identified 11 candidate genes by using cross-population extended haplotype homozygosity (XP-EHH) estimates, of which MARF1 and SF1 are under strong positive selection, as they are differentiated in high and low reproduction groups according to the three approaches used. Gene ontology enrichment analysis revealed that different biological pathways could be involved in the variation of fecundity in female goats. This study provides a new insight into the ROHs patterns for maintenance of within breed diversity and suggests a role of positive selection for genetic variation influencing fecundity in Chinese goat.

scholarly journals Novel Measles Virus Genotype, East Timor and Australia

2002 ◽  
Vol 8 (7) ◽  
pp. 735-737 ◽  
Author(s):  
Doris Chibo ◽  
Michaela Riddell ◽  
Michael Catton ◽  
Christopher Birch
Keyword(s):  
Measles Virus ◽  
East Timor ◽  
Virus Genotype
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