Alexandra Karunas

Dr. Alexandra Karunas

orcid

Research Focus & Metrics

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
22 December 2017 in Nature Genetics
Verified
Journal Article
Open access
PDF file
FDFlorence Demenais
Florence Demenais
PMPatricia Margaritte-Jeannin
Patricia Margaritte-Jeannin
KBKathleen C Barnes
Kathleen C Barnes
WCWilliam Oc Cookson
William Oc Cookson
JAJanine Altmüller
Janine Altmüller
DNDan Nicolae
Dan Nicolae
We examined common variation in asthma risk by conducting a meta-analysis of worldwide asthma genome-wide association studies (23,948 asthma cases, 118,538 controls) of individuals from ethnically diverse populations. We identified five new asthma loci, found two new associations at two known asthma loci, established asthma associations at two loci previously implicated in the comorbidity of asthma plus hay fever, and confirmed nine known loci. Investigation of pleiotropy showed large overlaps in genetic variants with autoimmune and inflammatory diseases. The enrichment in enhancer marks at asthma risk loci, especially in immune cells, suggested a major role of these loci in the regulation of immunologically related mechanisms.

21 September 2016 in Nature
Verified
Journal Article
Open access
PDF file
LPLuca Pagani
Luca Pagani
DLDaniel John Lawson
Daniel John Lawson
EJEvelyn Jagoda
Evelyn Jagoda
AMAlexander Mörseburg
Alexander Mörseburg
Anders ErikssonAnders Eriksson
Anders Eriksson
MMMait Metspalu
Mait Metspalu
Whole-genome sequencing of individuals from 125 populations provides insight into patterns of genetic diversity, natural selection and human demographic history during the peopling of Eurasia and finds evidence for genetic vestiges of an early expansion of modern humans out of Africa in Papuans. Three international collaborations reporting in this issue of Nature describe 787 high-quality genomes from individuals from geographically diverse populations. David Reich and colleagues analysed whole-genome sequences of 300 individuals from 142 populations. Their findings include an accelerated estimated rate of accumulation of mutations in non-Africans compared to Africans since divergence, and that indigenous Australians, New Guineans and Andamanese do not derive substantial ancestry from an early dispersal of modern humans but from the same source as that of other non-Africans. Eske Willerlsev and colleagues obtained whole-genome data for 83 Aboriginal Australians and 25 Papuans from the New Guinea Highlands. They estimate that Aboriginal Australians and Papuans diverged from Eurasian populations 51,000–72,000 years ago, following a single out-of-Africa dispersal. Luca Pagani et al. report on a dataset of 483 high-coverage human genomes from 148 populations worldwide, including 379 new genomes from 125 populations. Their analyses support the model by which all non-African populations derive most of their genetic ancestry from a single recent migration out of Africa, although a Papuan contribution suggests a trace of an earlier human expansion. High-coverage whole-genome sequence studies have so far focused on a limited number1 of geographically restricted populations2,3,4,5, or been targeted at specific diseases, such as cancer6. Nevertheless, the availability of high-resolution genomic data has led to the development of new methodologies for inferring population history7,8,9 and refuelled the debate on the mutation rate in humans10. Here we present the Estonian Biocentre Human Genome Diversity Panel (EGDP), a dataset of 483 high-coverage human genomes from 148 populations worldwide, including 379 new genomes from 125 populations, which we group into diversity and selection sets. We analyse this dataset to refine estimates of continent-wide patterns of heterozygosity, long- and short-distance gene flow, archaic admixture, and changes in effective population size through time as well as for signals of positive or balancing selection. We find a genetic signature in present-day Papuans that suggests that at least 2% of their genome originates from an early and largely extinct expansion of anatomically modern humans (AMHs) out of Africa. Together with evidence from the western Asian fossil record11, and admixture between AMHs and Neanderthals predating the main Eurasian expansion12, our results contribute to the mounting evidence for the presence of AMHs out of Africa earlier than 75,000 years ago.

1 October 2016 in Journal of Allergy and Clinical Immunology
Verified
Journal Article
Closed access
CSChloe Sarnowski
Chloe Sarnowski
PSPierre-Emmanuel Sugier
Pierre-Emmanuel Sugier
RGRaquel Granell
Raquel Granell
DJDebbie Jarvis
Debbie Jarvis
MDMarie-Hélène Dizier
Marie-Hélène Dizier
EBEmmanuelle Bouzigon
Emmanuelle Bouzigon

4 December 2011 in Molecular Biology
Verified
Journal Article
Closed access
PDF file
AKAlexandra Karunas
Alexandra Karunas
BYB. B. Yunusbaev
B. B. Yunusbaev
YFYu. Yu. Fedorova
Yu. Yu. Fedorova
GGG. F. Gimalova
G. F. Gimalova
NRN. N. Ramazanova
N. N. Ramazanova
EKE. K. Khusnutdinova
E. K. Khusnutdinova
Bronchial asthma is a chronic inflammatory respiratory disease caused by a complex interaction of environmental influences and genetic susceptibility. The first genome-wide association study of...

Verified
Journal Article
Open access
PDF file
BYBulat Ildusovich Yalaev
Bulat Ildusovich Yalaev
ATAnton Tyurin
Anton Tyurin
IPInga Prokopenko
Inga Prokopenko
AKAlexandra Karunas
Alexandra Karunas
EKElza Khusnutdinova
Elza Khusnutdinova
RKRita Khusainova
Rita Khusainova
Osteoporosis (OP) is a multifactorial bone disease belonging to the metabolic osteopathies group. Using the polygenic score (PGS) approach, we combined the effects of bone mineral density (BMD) DNA loci, affecting osteoporosis pathogenesis, based on GEFOS/GENOMOS consortium GWAS meta-analysis. We developed models to predict the risk of low fractures in women from the Volga-Ural region of Russia with efficacy of 74% (AUC = 0.740; OR (95% CI) = 2.9 (2.353–3.536)), as well as the formation of low BMD with efficacy of 79% (AUC = 0.790; OR (95% CI) = 3.94 (2.993–5.337)). In addition, we propose a model that predicts fracture risk and low BMD in a comorbid condition with 85% accuracy (AUC = 0.850; OR (95% CI) = 6.6 (4.411–10.608)) in postmenopausal women.

Verified
Journal Article
Open access
PDF file
ASAntonina Sorokan
Antonina Sorokan
AKAlexandra Karunas
Alexandra Karunas
AGAndrew Gordeev
Andrew Gordeev
Igor MaksimovIgor Maksimov
Igor Maksimov
Plant colonization by endophytic bacteria is mediated by different biomolecules that cause dynamic changes in gene expression of both bacteria and plant. Phytohormones, in particular, salicylic acid, play a key role in the regulation of endophytic colonization and diversity of bacteria in methaphytobiome. For the first time it was found that salicylic acid influenced motility in biofilms and transcription of the surfactin synthetase gene of the endophytic strain Bacillus subtilis 26D in vitro. Treatment of Solanum tuberosum plants with salicylic acid, along with B. subtilis 26D, increased the number of endophytic cells of bacteria in potato internal tissues and level of transcripts of bacterial surfactin synthetase gene and decreased transcription of plant PR genes on the stage of colonisation with endophytes. Thus, the production of surfactin plays an important role in endophytic colonization of plants, and salicylic acid has an ability to influence this mechanism. Here we firstly show that plants treated with salicylic acid and B. subtilis 26D showed enhanced resistance to the late blight pathogen Phytophthora infestans, which was accompanied by increase in transcriptional activity of plant PR-genes and bacterial surfactin synthetase gene after pathogen inoculation. Therefore, it is suggested that salicylic acid can modulate physiological status of the whole plant–endophyte system and improve biocontrol potential of endophytic strains.