The Joshua Tree Album

Our lab trip to Joshua Tree NP and photo session before the start of the quarter resulted in our 2017 album cover lab photo.

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We also visited one of Julia’s field sites where she is working on a lichen biodiversity inventory and some comparison of the genetic diversity of the fungi and algae symbiont along an elevation gradient in the park.
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Derreck is excited to collect some dung samples that may recover some zygomycete isolates for the Zygolife project. StajichLab-1-31

The rest of pictures from the day are in this flickr album.

Welcome new graduate students Tania and Julia

Welcome to first year graduate students Julia Adams (Plant  Biology) and Tania Kurbessoian (Microbiology). Tania joins us after completing a MS in Microbiology at Cal State-Northridge. She will starting out work on projects relating to genomics and physiology of extremophilic fungi,  black yeasts and efforts to culture and describe diversity of desert fungi. Julia completed a BS at Wellesley and has worked on a variety of projects related to lichen fungi. She will focus on lichen fungi from desert regions and will use genomic and potentially metabolomic tools to study evolution and unique properties of some lichenized fungi endemic to Joshua Tree National Park and the Mojave desert.

Congrats Nat on passing qualifying exam

Congrats to Nuttapon (Nat) who passed his qualifying exam this week and is now a PhD Candidate. Along with Derreck he is the second Plant Pathology graduate student in the lab and is working towards his PhD on microbial diversity of cryptogamic or biological soil crusts found in the desert. His primary research area is Joshua Tree National Park and desert areas in the UC Reserve System. Nat and Jason have benefited greatly from collaboration with New Mexico State Univ Professor Nicole Pietrasiak who is an expert in crusts, desert algae, and did her PhD work in Joshua Tree which harbors tremendous diversity of biological soil crust types.

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Cross section of crust. Image by N. Pietrasiak

 

Chytrid Opsin structure paper published

Great work by former graduate student Steven Ahrendt (@sahrendt0), visiting student and current Duke graduate student Edgar Medina (@WhippingFungi) on the publication of a manuscript describing a Type II Opsin found in the zoosporic fungi.  “Exploring the binding properties and structural stability of an opsin in the chytrid Spizellomyces punctatus using comparative and molecular modeling” in PeerJ! Thanks also to co-author and collaborator Chia-en Chang in Chemistry Dept at UCR who helped mentor Steven on homology modeling and docking analyses. I also learned a lot through this project and was excited to be able to merge evolutionary and computational approaches. The project lead to the surprising findings of a gene important for light sensing that is shared among just the zoosporic (fungi with a flagellate life stage) and animals.

This project has been going for a while … Edgar and I discovered this protein in ~2008 when we started independently analyzing the Batrachochytrium genome, the first chytrid fungus sequenced. Based on sequence similarity we realized it looked like an animal rhodopsin, a 7 transmembrane G-protein coupled receptor (GPCR). These rhodopsins are called type II opsins and typically respond to green light.  We went looking for this in the first place because of work published in 1997 from Ken Foster’s lab which showed that zoosporic chytrid fungi respond to green light and that likely this behavior is due to a rhodopsin or rhodopsin-like GPCR  We found longer intact copy in the genome of the chytrid S. punctatus, so decided to focus on that copy – though we later discovered additional modifications of the predicted gene structure appeared necessary. We decided to do some homology modeling with the solved structure of a squid rhodopsin as shown in Figure 1. This confirmed that the sequence was compatible with the Type II Opsin structure. The paper documents several other computational simulations to test for the likely binding chromophore and hypothesis testing about the stability of the protein structure. Overall this work provides confidence that the sequence encoded in the genome of the zoosporic fungus can fold into a structure compatible with an opsin.

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Figure 1A: Structural alignment of S. punctatus homology model (grey) with T. pacificus crystal structure (light purple)

It still remains to be tested if this opsin-like gene can biochemically function in this way. We hope to explore more of that with some additional work in the future. We have also nearly completed our manuscript analyzing the evolutionary history of this protein in fungi and related species to give a better picture of the timing of the emergence of this receptor-like protein. This project has helped advance some ideas about how zoosporic fungi interact with their environment based on genomic and computational analyses. This gene is a good candidate for future investigations into environmental sensing and signaling in zoosporic fungi.

Asilomar and beyond

Just back from another fantastic Fungal Genetics Conference at Asilomar. An amazing number of helpful tweets under the #Fungal17 hashtag. Sarah Unruh (@sau916) and I are talking about how to best archive or building a storify this so it is easier to read. Always a fun meeting to see friends and nosh at the smorgasbord of fungal genetics, epigenetics, genomics, ecology, evolution, and chemistry that is going on. Jason got to give a Plenary talk and express the utility of sequencing fungal genomes in studying their evolution. Lab Alumnus Steven Ahrendt won a poster award on his work on Cryptomycota fungi and also gave a talk. 


Also got some good news that our paper on structural analyses of a rhodopsin-like protein in the chytrid fungi has been accepted at PeerJ after some helpful revisions – (see the preprint).

Onward!

2016 Round Up – by the numbers

Quick post to sum up some of the news from 2016 and head into 2017.

  • Six manuscripts were published and an additional two were accepted and three more were submitted or being revised in 2016
  • Three graduate students survived another year in the lab: Sawyer, Nat, Derreck
  • Joined by one Microbiology graduate student Jesus Pena joined in Fall 2016.
  • Nine undergraduates worked in the lab Deane, Josh, Jericho, Dillon, Na, Justin, Serena, Leandra, George and Travis has been part of bioinformatics projects
  • One postdoc, Jinfeng has been the bioinformatics and genomics guru from genome assembly to transposon bioinformatics
  • One new assembly of a Citrus genome
  • At least 15 new genomes from our work with Zygolife and 1000 Fungal Genomes project were released or material processed. More than 100 cultures of some fungi are being examined in the lab.
  • One NSF grant started on systematics of anaerobic chytrid fungi and one new grant awarded as part of the UC MRPI http://ucop.edu/research-initiatives/programs/mrpi/2017-Awards.html program on the “UC Valley Fever Research Initiative” lead by UCSF and including several other UC campus.
  • Jason is on sabbatical in 2017 at Oregon State University.

MSA 2016

Some us from the lab took a trip up to Berkeley, CA for the MSA 2016 meeting. We road tripped by car from Riverside through the central valley up to Berkeley.

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At the conference we had a great chance to meet with other mycologists, ecologists, and fungal enthusiasts. The meeting was fantastic from the Clark Kerr campus at UC Berkeley we had dorm life living so everyone was close by and could eat meals together. The talks and posters were really outstanding and such fun to talk about interesting research in fungi. Clearly genomics, next generation sequencing are at the forefront of tools used by the community but new approaches to visualizing communities and exploring the interactions between fungi and partners like bacteria and plants were very well explored in the meeting. Some great work on microbiomes and mycobiomes of insects and amphibians also made for some fascinating new results.  There was a MSA session dedicated to some results from the ZyGoLife project and our team also had a one day meeting earlier in the week at the Joint Genome Institute to catch up on all the different team projects (a long post on this will appear on the zygolife project page soon). It was also fun to catch up with former lab member Steven Ahrendt who now works at JGI on early diverging fungi genome projects.

The meeting also featured Arturo Casadevall as the Karling lecture – an honor to bring in a scientist who is likely an outside member of the MSA community to speak about fungi. Dr Casadevall gave a lecture that covered the importance of collaboration, the impact of the pressure to publish in ‘one word journals’, and reviewed his provocative hypothesis about the link in the success of fungi, dinofall of dinosaurs, and rise of mammals. He also paid tribute to Thomas Taylor, a Zygolife collaborator who sadly passed away this Spring but who would have been the Karling lecturer this year.

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Jason spoke on new population genomics work on Candida and Fusarium, while Sawyer presented a poster on Rhizopus stolonifer resequencing and population genomics; Derreck presented a poster on Bacteria-Fungi interactions on Serratia and zygomycete fungi; Nat presented his poster on data from first environmental sequencing of desert biological soil crusts from Joshua Tree National Park. On the way back we stopped for an overnight in Pinnacles National Park. Much fun, science, and discussions were had throughout the week.

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We also stopped to take our first lab album cover photo while in Pinnacles. More to come!

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