Sascha Knauf

Dr. Sascha Knauf

Work Group Neglected Tropical Diseases, Infection Biology Unit, Deutsches Primatenzentrum GmbH, Kellnerweg 4, 37077 Goettingen, Germany
orcid

Research Focus & Metrics

Academic Career Length

15Years (2012-Present)

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

Representative Publications

View All Publications
2 June 2023 in Science
Verified
Journal Article
Closed access
LKLukas Kuderna
Lukas Kuderna
HGHong Gao
Hong Gao
MJMareike Janiak
Mareike Janiak
MKMARTIN KUHLWILM
MARTIN KUHLWILM
JOJoseph D. Orkin
Joseph D. Orkin
TMTomas Marques
Tomas Marques
The rich diversity of morphology and behavior displayed across primate species provides an informative context in which to study the impact of genomic diversity on fundamental biological processes. Analysis of that diversity provides insight into long-standing questions in evolutionary and conservation biology and is urgent given severe threats these species are facing. Here, we present high-coverage whole-genome data from 233 primate species representing 86% of genera and all 16 families. This dataset was used, together with fossil calibration, to create a nuclear DNA phylogeny and to reassess evolutionary divergence times among primate clades. We found within-species genetic diversity across families and geographic regions to be associated with climate and sociality, but not with extinction risk. Furthermore, mutation rates differ across species, potentially influenced by effective population sizes. Lastly, we identified extensive recurrence of missense mutations previously thought to be human specific. This study will open a wide range of research avenues for future primate genomic research.

2 June 2023 in Science
Verified
Journal Article
Closed access
HGHong Gao
Hong Gao
THTobias Hamp
Tobias Hamp
JEJeffrey Ede
Jeffrey Ede
JSJoshua G. Schraiber
Joshua G. Schraiber
JMJeremy McRae
Jeremy McRae
KFKyle Kai-How Farh
Kyle Kai-How Farh
Personalized genome sequencing has revealed millions of genetic differences between individuals, but our understanding of their clinical relevance remains largely incomplete. To systematically decipher the effects of human genetic variants, we obtained whole-genome sequencing data for 809 individuals from 233 primate species and identified 4.3 million common protein-altering variants with orthologs in humans. We show that these variants can be inferred to have nondeleterious effects in humans based on their presence at high allele frequencies in other primate populations. We use this resource to classify 6% of all possible human protein-altering variants as likely benign and impute the pathogenicity of the remaining 94% of variants with deep learning, achieving state-of-the-art accuracy for diagnosing pathogenic variants in patients with genetic diseases.

6 October 2021 in Vaccines
Verified
Journal Article
Open access
PDF file
ETEeva S. M. Tuppurainen
Eeva S. M. Tuppurainen
KDKlaas Dietze
Klaas Dietze
JWJanika Wolff
Janika Wolff
HBHannes Bergmann
Hannes Bergmann
DADaniel Beltran Alcrudo
Daniel Beltran Alcrudo
Sascha KnaufSascha Knauf
Sascha Knauf
The geographical distribution of lumpy skin disease (LSD), an economically important cattle disease caused by a capripoxvirus, has reached an unprecedented extent. Vaccination is the only way to prevent the spread of the infection in endemic and newly affected regions. Yet, in the event of an outbreak, selection of the best vaccine is a major challenge for veterinary authorities and farmers. Decision makers need sound scientific information to support their decisions and subsequent actions. The available vaccine products vary in terms of quality, efficacy, safety, side effects, and price. The pros and cons of different types of live attenuated and inactivated vaccines, vaccination strategies, and associated risks are discussed. Seroconversion, which typically follows vaccination, places specific demands on the tools and methods used to evaluate the effectiveness of the LSD vaccination campaigns in the field. We aimed to give a comprehensive update on available vaccines and vaccination against LSD, to better prepare affected and at-risk countries to control LSD and ensure the safe trade of cattle.

29 November 2023 in Nature
Verified
Journal Article
Open access
PDF file
LKLukas Kuderna
Lukas Kuderna
JUJacob C. Ulirsch
Jacob C. Ulirsch
SRSabrina Rashid
Sabrina Rashid
MAMohamed Ameen
Mohamed Ameen
LSLaksshman Sundaram
Laksshman Sundaram
KFKyle Kai-How Farh
Kyle Kai-How Farh
Noncoding DNA is central to our understanding of human gene regulation and complex diseases1,2, and measuring the evolutionary sequence constraint can establish the functional relevance of putative regulatory elements in the human genome3–9. Identifying the genomic elements that have become constrained specifically in primates has been hampered by the faster evolution of noncoding DNA compared to protein-coding DNA10, the relatively short timescales separating primate species11, and the previously limited availability of whole-genome sequences12. Here we construct a whole-genome alignment of 239 species, representing nearly half of all extant species in the primate order. Using this resource, we identified human regulatory elements that are under selective constraint across primates and other mammals at a 5% false discovery rate. We detected 111,318 DNase I hypersensitivity sites and 267,410 transcription factor binding sites that are constrained specifically in primates but not across other placental mammals and validate their cis-regulatory effects on gene expression. These regulatory elements are enriched for human genetic variants that affect gene expression and complex traits and diseases. Our results highlight the important role of recent evolution in regulatory sequence elements differentiating primates, including humans, from other placental mammals.

12 November 2019 in eLife
Verified
Journal Article
Open access
JFJulia Fischer
Julia Fischer
JHJames P Higham
James P Higham
SASusan C Alberts
Susan C Alberts
LBLouise Barrett
Louise Barrett
JBJacinta C Beehner
Jacinta C Beehner
DZDietmar Zinner
Dietmar Zinner
Baboons, members of the genus Papio, comprise six closely related species distributed throughout sub-Saharan Africa and southwest Arabia. The species exhibit more ecological flexibility and a wider range of social systems than many other primates. This article summarizes our current knowledge of the natural history of baboons and highlights directions for future research. We suggest that baboons can serve as a valuable model for complex evolutionary processes, such as speciation and hybridization. The evolution of baboons has been heavily shaped by climatic changes and population expansion and fragmentation in the African savanna environment, similar to the processes that acted during human evolution. With accumulating long-term data, and new data from previously understudied species, baboons are ideally suited for investigating the links between sociality, health, longevity and reproductive success. To achieve these aims, we propose a closer integration of studies at the proximate level, including functional genomics, with behavioral and ecological studies.

19 April 2018 in Scientific Reports
Verified
Journal Article
Open access
PDF file
LHLuisa K. Hallmaier-Wacker
Luisa K. Hallmaier-Wacker
SLSimone Lueert
Simone Lueert
Christian RoosChristian Roos
Christian Roos
Sascha KnaufSascha Knauf
Sascha Knauf
Next-generation sequencing approaches used to characterize microbial communities are subject to technical caveats that can lead to major distortion of acquired data. Determining the optimal sample handling protocol is essential to minimize the bias for different sample types. Using a mock community composed of 22 bacterial strains of even concentration, we studied a combination of handling conditions to determine the optimal conditions for swab material. Examining a combination of effects simulates the reality of handling environmental samples and may thus provide a better foundation for the standardization of protocols. We found that the choice of storage buffer and extraction kit affects the detected bacterial composition, while different 16S rRNA amplification methods only had a minor effect. All bacterial genera present in the mock community were identified with minimal levels of contamination independent of the choice of sample processing. Despite this, the observed bacterial profile for all tested conditions were significantly different from the expected abundance. This highlights the need for proper validation and standardization for each sample type using a mock community and blank control samples, to assess the bias in the protocol and reduce variation across the datasets.