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small RNA group Mainz
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The small RNA group represents a research focus of the Institute of Organismic and Molecular Evolution at the Johannes Gutenberg University. Our work intends to provide insights into function and evolution of small RNA pathways in diverse animal species including human and non-human primates and model systems such as mouse and drosophila, with the emphasis being on the fast evolving Piwi/piRNA system.
We concentrate on comparative analyses of small RNA transcriptomes and the development of new bioinformatic tools such as the piRNA cluster prediction software proTRAC that allow us to reveal functional and evolutionary coherences based on high-throughput sequencing data. We closely collaborate with the Institute of Molecular Biology (IMB), especially with the group of René Ketting (Biology of non-coding RNA). We participate in the IMBs International PhD Program (IPP), International Summer School (ISS) and are part of the research focus GeneRED (Gene Regulation in Evolution and Development).

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New paper puplished in RNA: Temperature-responsive miRNAs in Drosophila orchestrate adaptation to different ambient temperatures. We show that small RNA profiles critically depend on the ambient temperature and that Drosophila utilizes miRNAs for global changes in gene expression as a physiologic answer to changes in ambient temperature. Further, changes in ambient temperature affect piRNA ping-pong amplification rates which is presumably driven by less stable secondary structures of transposon transcripts at higher temperatures.
The paper will be published as a Report in the upcoming RNA September issue 23 (9).
unitas update (1.1.0) is out now. Minor bugs were removed and new functionality was included, e.g., the '-riborase' option for most sensitive detection of rRNA fragments using a complete set of rRNA reference sequences from NCBI nucleotide database.
First unitas update (1.0.1) is out now. With the new Ensembl release 88, Ensemble Genomes release 35 and SILVA rRNA database releas 128, the number of supported species grows to 835. The total available reference RNA data for small RNA annotation (synchronized on our server) comes up to more than 9 GB.
proTRAC update (2.3.0) is out now. GD image files are disabled, which means that proTRAC no longer requires the GD module (installation of GD on some computers may be difficult for cryptic reasons). Input SAM files no longer need to be sorted and sequence data used to create SAM files must not be collapsed any longer.
New paper puplished in Journal of Biological Chemistry: Co-chaperone Hsp70/Hsp90 organizing protein (Hop) is Required for Transposon Silencing and piRNA Biogenesis. Karam and colleagues show that knockdown of Hop in the germ-line nurse cells (GLKD) of Drosophila ovaries leads to activation of transposons and increased DNA damage due to inefficient piRNA biogenesis.
In the course of a reorganization of working groups within the Biological Faculty, the former Institute of Anthropology is taken up in the newly formed Institute of Organismic and Molecular Evolutionary Biology.
New paper puplished in Reproduction: Bovine piRNA-like RNAs are associated with both mobile elements and mRNAs. Stewart J. Russell and coworkers show that piRNAs target both transposons and mRNAs in the early bovine embryo and that target-mRNA expression negatively correlates with piRNA expression, suggesting a role for piRNAs beyond transposon silencing in early embryogenesis.
The new proTRAC version (2.2.0) is out now. Finally, proTRAC accepts SAM files as input which means you can now use a more popular aligner such as Bowtie or STAR if you think sRNAmapper is to slow. BUT NOTE: SAM files must be sorted according to chromosome coordinates and FASTA/FASTQ files still must be collapsed! You should also make sure to allow multi-mapping.
For those who want to keep things easy, we still recommend to use sRNAmapper as it produces an appropriate map file when using the default settings.
Next lecture of the "Introduction to Epigenetics" series: Tuesday, 8 November 2016. The lecture will be held by David Rosenkranz: “Primate piRNA/PIWI: functional aspects and evolution” from 08:15-09:45 am. IMPORTANT: The lecture will be held in the lecture hall 7 (HS 7), Forum 1, JGU Campus. For further information please see the attached poster or visit the IMB homepage.
A new model organism in our group: The pond snail Lymnaea stagnalis.
The Lecture Series "Introduction to Epigenetics" starts on Tuesday, 25 October. The lecture series is open for everybody interested. The lecture 'Primate piRNA/PIWI: functional aspects and evolution' will be held on Tuesday, 8 November by David Rosenkranz from 8:15-9:00 a.m. You can download the Lecture Series schedule here.
We added BED files comprising clustered piRNAs and piRNA clusters for each SRA dataset to piRNA cluster database.
Candidates of the small RNA group will present their research projects at the smallRNAgroup Mini-Symposium. The Symposium will be held on 18th May, 14:00-15:00 in the Institute of Anthropology, seminar room. The Symposium is aimed at master students that intend to do their master thesis in the group of David Rosenkranz, as well as all other interested Biology/Anthropology students.
small RNA group Mainz offers a project in the course of the International PhD programm 2016. Registration deadline is 01. May 2016. Application deadline is 08. May 2016. For more information on the IPP 2016 go to the IMB website.
Apply to the International Summer School programm and become part of the small RNA group Mainz. The application deadline is 10. April 2016. For more information on the ISS 2016 go to the IMB website.
Use our new PHASER tool to quantify the amount of phased piRNAs. Download the tool here.
piRNA cluster database paper is published in Nucleic Acids Research. piRNA cluster database: a web resource for piRNA producing loci.
A new review article is published in Wiley Interdisciplinary Reviews: RNA. RNA-based regulation of transposon expression.
proTRAC version 2.1 is now available for download at the software section. PNG image output files have been replaced by convenient HTML output files. The Transcription Factor Binding Site search function now includes sequences for three more testis expressed transcription factors (Gata4, SPZ1 and SOX9) involved in testis development and fertility.
piFETCH, a fetching tool for piRNA cluster database is available for download in the software section.
'Data in Brief'-paper is available online at Genomics Data. The article provides detailed information on material and methods (applied to generate the according NCBI GEO datasets) for the Roovers et al. paper puplished in Cell Reports 2015.
Two SRA datasets from chicken were added to the piRNA cluster database. In line with data from fly and fish, and contrasting piRNAs in the mammalian adult male germline, piRNAs in chicken testis are enriched for transposon derived sequences compared to the whole genome situation.
Datasets from mouse, rat, cow, pig, zebrafish and fruitfly were added to the piRNA cluster database which now comprises more than 33,000 piRNA clusters from 11 species.
New paper is out in PLoS ONE: piRNAs from Pig Testis Provide Evidence for a Conserved Role of the Piwi Pathway in Post-Transcriptional Gene Regulation in Mammals.

Marmoset (Callithrix jacchus) and Rhesus monkey (Macaca mulatta) join the piRNA cluster database which now comprises 7558 piRNA clusters from 5 species. We also added heatmaps that refer to piRNA expression of different genomic loci accross different SRA datasets for each species.

Tree shrew (Tupaia belangeri) joins the piRNA cluster database with 139 piRNA clusters. With ~20% of transposon related sequences (total genome ~36%), piRNA clusters in tree shrew exhibit a very low amount of transposon sequences compared to other mammalian species studied thus far.

piRNA cluster database launch19/04/2015
Launch of piRNA cluster database, a comprehensive database for genomic piRNA clusters. We start with datasets from Homo sapiens and Macaca fascicularis. The database will be under construction until the first full release which is scheduled for the end of June 2015. During this time new datasets will be added bit by bit.

Cell Reports paper26/03/2015
New paper published in Cell Reports: Piwi proteins and piRNAs in mammalian oocytes and early embryos.

RNA paper23/03/2015
New paper published in RNA: Tupaia small RNAs provide insights into function and evolution of  RNAi-based transposon defense in mammals.