Liz Tseng Profile Banner
Liz Tseng Profile
Liz Tseng

@Magdoll

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Applications product manager @PacBio . #RNA / #GeneTherapy / #bioinformatics . @uwcse PhD. she/her. Aerialist/pole dancer. Opinions are my own.

Bay Area, California
Joined January 2009
Don't wanna be here? Send us removal request.
@Magdoll
Liz Tseng
5 months
If you're studying #bioinformatics , there comes a time when you have to decide between: - staying in academia - going into industry - give up #bioinformtics and do something else Well, let me tell you what it was like for me to work as a #bioinformatics in the biotech
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@Magdoll
Liz Tseng
4 years
You don't see what you don't see if you don't sequence more than 1 genome. Pan-genome of 26 soy bean lines reveal SVs, gene fusions, core/disposable genes. @PacBio
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@Magdoll
Liz Tseng
3 years
#Bioinformatics troubleshooting tip of the day: when it doubt, look at the sequence by eye. Not the alignment, the GFF, or the IGV screenshot. *THE ACTUAL SEQUENCES*. Here's how (using @PacBio Iso-Seq CCS BAM) files as an example: /1
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@Magdoll
Liz Tseng
4 months
A nice review of long-read genome assemblers and its associated #bioinformatics terms
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@Magdoll
Liz Tseng
1 year
As a bioinformatician I am dying at this. Looks like Hollywood should hire me for consulting next time 🤦‍♀️
@OdedRechavi
Oded Rechavi
1 year
When the lab's bioinformatician quits and goes to work for Facebook
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@Magdoll
Liz Tseng
6 years
#ASHG18 is great, but you know what’s better? They have childcare on site, so I don’t have to think about childcare logistics while I’m here. #WomenInSTEM
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@Magdoll
Liz Tseng
3 months
Nice in-depth review of the new T2T / pangenome era by @mike_schatz et al: why gapless human genomes that now have resolved centromeres, telomeres, and segmental duplications and having pangenome to capture genetic diversity is essential to human health.
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@Magdoll
Liz Tseng
2 years
We at @PacBio are finally presenting to the world, at long last, isoform information at #singlecell resolution - some details on the tech background for the kit and #Bioinformatics below 🧵
@PacBio
PacBio
2 years
We’ve partnered with the @broadinstitute and @10xgenomics to launch the Multiplexed Arrays Sequencing (MAS-Seq) kit, an accurate and cost-effective long-read single cell #RNASeq solution. Learn more here: #PacBio #ASHG22
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@Magdoll
Liz Tseng
2 years
#bioinformatics tip of the day: FOLLOW THE DATA. Trace a read through its journey. Example is when I look at a fresh @PacBio Iso-Seq run (but really for any sequencing data for any application). I start w CCS reads, scroll through them to viz the primers and polyA tail. /1
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@Magdoll
Liz Tseng
4 months
Possibly the most complex genome ever assembled of the most harvested (by tonnage) crop in the world - the polyploid sugarcane R570 hybrid - assembled to 8.7 Gb with 12 chromosomes. @PacBio + short reads used for both WGS and RNA-Seq.
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@Magdoll
Liz Tseng
2 years
We showed you @PacBio MAS-Seq #singlecell data on Sequel II/IIe systems, well, now, here it is --- on Revio! Two cells of PBMC data have been released, 110m and 114m reads each.
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@Magdoll
Liz Tseng
4 years
@CA_AstroComm PhD in Computer Science here working in genomics/bioinformatics!
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@Magdoll
Liz Tseng
2 years
The 80s @PacBio vibe continues!
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@Magdoll
Liz Tseng
3 years
Personal #bioinformatics tips that helped me: (1) organize work by year/[author-project]/[month-sample-platform], (2) keep a README for data source, copy email, (3) keep a cmd file (I name it ) in each data analysis folder, (4) keep slides there too
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@Magdoll
Liz Tseng
2 years
Finally read in detail the breast cancer @PacBio Iso-Seq paper and it’s amazing finding - novel isoforms seen only in clinical tumor samples that correlate w survival outcome and cancer subtypes!
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@Magdoll
Liz Tseng
4 years
Plant pan-genomes are the new trend! This is now possible becuz of reduced seq cost, long reads, better algorithms, and the need to understand within-species diversity. A quick thread 1/4 All pub find courtesy of @phototrophic
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@Magdoll
Liz Tseng
2 months
Analysis of 170 @PacBio HiFi genomes identified 7000+ segmentation duplications (SD) that comprise 6.1% of the (T2T CHM13) genome. African genomes show higher copy number of multi-copy SDs. Comparing to Iso-Seq data finds 201 novel protein-coding gene in multicopy SDs.
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@Magdoll
Liz Tseng
5 months
LongSom: a #bioinformatics workflow for detecting de novo SNVs, CNAs, #cancer gene fusions to reconstruct tumor clonal heterogeneity. Shows that with @PacBio long-read single-cell RNA-Seq you can reconstruct clones and find clinically relevant SNVs in each clone. Nice work
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@Magdoll
Liz Tseng
3 years
just did bamtools-awk-grep-uniq one liner. I feel dirty and cool at the same time. #Bioinformatics
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@Magdoll
Liz Tseng
1 year
As a preview to the upcoming MAS-Seq for bulk Iso-Seq, here's a @PacBio HG002 MAS bulk x Revio dataset for you to play with! 38 million full-length HiFi reads on 1 Revio SMRT Cell! Enjoy :) More to come.
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@Magdoll
Liz Tseng
2 years
Needless to say I’m all in for @PacBio pink
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@Magdoll
Liz Tseng
3 years
Check this cool baby I'm working on! Single-cell Iso-Seq reads separated by cell types *and* colored by alleles (based on phasing info I ran w IsoPhase). Each alignment is an individual founder molecule. @PacBio #bioinformatics
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@Magdoll
Liz Tseng
1 month
Analysis of ENCODE @PacBio Iso-Seq data using isoLASER (variant calling + phasing + linkage analysis) distinguishes cis- v trans-directed alternative splicing. Finds genetic linkage of splicing is largely individual-specific and enriched in immune genes (e.g. HLA).
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@Magdoll
Liz Tseng
5 years
My @Medium interview w @sedlazeck @MedhatHelmy7 is out! We cover SV calling w long reads, the life cycle of #Bioinformatics tools, why it never hurts to ask for a postdoc you feel unqualified for, and the future for population SV calling!
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@Magdoll
Liz Tseng
4 years
In the coming weeks, I will be releasing a mini series on my @medium blog featuring different @PacBio HiFi assemblers! The interview with @lh3lh3 @ChengChhy (HiFiAsm) has been done and draft is underway. Stay tuned 🥰
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@Magdoll
Liz Tseng
3 months
The news has come out that my company, PacBio, has just gone through a significant layoff. A few notes on this: This says nothing about the high talent of those who were let go. Many of them have contributed critically over the years - some, even before we even had the first
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@Magdoll
Liz Tseng
3 years
Cautionary tale in #BioInformatics : when the results don't look right, and you change the tool parameter (ex: score/length/filter cutoff), and things look *better*, you should NOT think you've saved the day. Most likely, the fault is in the data, not the tool /1
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@Magdoll
Liz Tseng
3 years
Jonas showing the @PacBio HiFi accuracy. Really this is all the amazing work at lots of ppl (me not included) for making this possible. 👏 #AGBT21
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@Magdoll
Liz Tseng
2 years
1/ End of an era for my #bioinformatics contribution to @PacBio Iso-Seq ( #RNA analysis) --- with the release of isoseq3 v3.8.0, I've removed large chunks of now out-dated modules in Cupcake and will be deprecating the rest soon 🧵
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@Magdoll
Liz Tseng
3 years
. @aphillippy : new complete human genome CHM13v1.1 assembly using PacBio HiFi + ONT UL, no gaps, ~Q70, structurally correct. sees high seq similarity between the acrocentric arms, ~66Mbp new seqs, 1561 new genes. #gi2021
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@Magdoll
Liz Tseng
3 years
Using @PacBio finds long (up to 23kb!) cell-free DNA in maternal plasma with methylation patterns that distinguish tissue origin. potential for NIPT and pregnancy-related risks (ex: preeclampsia)
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@Magdoll
Liz Tseng
5 years
Highlighting (what I think are) important bioinformatics tools for long read RNA-seq analysis works by me & @GenomeRIK @anaconesa @DNAwyman @XLR @PacBio #PBUGM
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@Magdoll
Liz Tseng
2 years
The line for the @PacBio #ASHG22 party! #ASHG2022
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@Magdoll
Liz Tseng
26 days
Eichler: PAV, discovery of structural variants by comparing phased (or unphased) genomes against each other. breakpoint resolution. #Bioinformatics #ISMB2024
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@Magdoll
Liz Tseng
4 years
One year after tackling its genome, we're releasing the @PacBio redwood Iso-Seq dataset - and here's the @medium blog to go with it! I'll talk about it at PAGday Iso-Seq workshop on Tue too!
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@Magdoll
Liz Tseng
2 years
Your cheat sheet of @PacBio bulk Iso-Seq publications from the last few months (single-cell Iso-Seq will be in a diff thread), here we go! /1
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@Magdoll
Liz Tseng
2 months
Analysis of @GenomeInABottle and @1000genomes genomes reveal ribosomal RNA diversity not previously discovered - most short indels and GC-rich! Also changes in rRNA variant expression in cancer suggest cancer-specific ribosomes. @PacBio
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@Magdoll
Liz Tseng
4 years
Cool preprint using @PacBio Iso-Seq + RNA-Seq on combined 22 breast cancer samples to find differentially expressed genes *and* isoforms. They were able to define "common" v subtype-specific isoforms. Found five 3-hop fusion genes confirmed w WGS.
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@Magdoll
Liz Tseng
4 months
Use of Tomahto, a new targeted mass spec method, combined with @PacBio Kinnex full-length RNA data to to increase detection of isoforms that are turned into proteins - the first step into a personalized proteome. Great work from @GSheynkman lab!
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@Magdoll
Liz Tseng
4 years
The latest @PacBio Iso-Seq #Bioinformatics software landscape. Want to know more about it? Come to the Global Summit next week!
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@Magdoll
Liz Tseng
6 months
Spatial transcriptomics at isoform resolution reveals isoform switching events in heart tissue post myocardial infarction - here's a use case of combining 10x Visium with the @PacBio MAS-Seq single-cell kit. No short reads needed. If you missed the story - the webinar recording
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@Magdoll
Liz Tseng
3 years
You can tell a lot about me by just looking at my feet today 😎 #WomenInScience #WomenInSTEM #WomenInScienceDay2021
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@Magdoll
Liz Tseng
5 months
As someone who works in the industry, the skills I learned from getting a PhD that are still relevant 10 years later has nothing to do with writing algorithms or tenure. It is rather, just a mindset and a way of handling hard problems at work and in life. /1
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@Magdoll
Liz Tseng
5 years
I just asked a Q at #gi2019 (cuz @lpachter wants more girls to ask Q) and guess what? my CSHL collaborator, sitting in her office listening in on the talks - emailed me right after and said "HEY I HEARD YOU let's chat tomorrow". So ladies, SPEAK UP.
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@Magdoll
Liz Tseng
3 years
De novo isoform-level phasing using @PacBio Iso-Seq! Years ago I developed IsoPhase (v0) that used the genome to identify SNPs and phase, now we are experimenting w directly going into phasing, which would eliminate the need for a genome! #PlantBiology
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@Magdoll
Liz Tseng
5 months
@PacBio 12/ If the idea of a grant gives you vertigo but instead you are: - Passionate about science - Likes solving problems, no matter where they come from ("intron retention in plants? yes! alternative splicing in alzheimer's brains? of course!") - Wants to do something else in the
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@Magdoll
Liz Tseng
2 years
Going head-to-toe @PacBio today (mask, shirt, bag, socks!) I guess I’m just missing the hat….
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@Magdoll
Liz Tseng
2 years
Measuring polyA length using @PacBio w a modified "PAIso-Seq" protocol, works for 0.5ng of total RNA....😮
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@Magdoll
Liz Tseng
6 months
What does "full-length (FL) transcript" mean for @PacBio Iso-Seq and how is it determined w #bioinformatics ? In long-read RNA-Seq land, a read with both the 5' and 3' cDNA primer, and the polyA tail preceding the 3' end is determined to be a "full-length" (FL) read. /1
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@Magdoll
Liz Tseng
9 months
The future of #RNA -Seq is now. The Kinnex kits are both a @PacBio company story and a personal story. /1🧵
@PacBio
PacBio
9 months
The future of RNA sequencing is with long reads! Check out these helpful resources on the new Kinnex RNA kits: #PacBio #ASHG23 #ASHG2023
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@Magdoll
Liz Tseng
3 years
Comprehensive @PacBio Iso-Seq breast cancer dataset including tumor samples that contain novel isoforms (that changes ORF) not seen in cell lines! Found 35 alt. splicing events assoc w patient survival. congrats @adeslat :)
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@Magdoll
Liz Tseng
5 years
Just interviewed @sedlazeck and @MedhatHelmy7 on their SV review paper (for my @Medium blog) but we covered so much more ground incl. history of SV, tool dev, postdoc, population scaling...AHHHH why do I have more meetings today I just want to write NOW 😭
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@Magdoll
Liz Tseng
4 years
I don't know why I have to say this, but the most effective #bioinformatics strategy to "why something isn't working", sometimes, is to just actually open up the fasta file in a text editor, Ctrl+F to find, look at a handful of sequences by eye, and you usually know what's wrong.
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@Magdoll
Liz Tseng
6 months
Isoform classification - a largely solved #bioinformatics problem. (hot take? come at me 🌶️) One of the most popular isoform classification tool is SQANTI. Originally published in 2018, SQANTI is now in its 3rd version (SQANTI3) and is also implemented as `pigeon` in @PacBio
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@Magdoll
Liz Tseng
4 years
The Vertebrate Genome Project assembled genomes are now on @GenomeBrowser ! @genomeark @PacBio #bioinformatics
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@Magdoll
Liz Tseng
3 years
My #bioinformatics superpower is discovering other people using (1) wrong primer sequences; (2) wrong primer orientations; (3) wrong file names; (4) using default parameters that don't apply. That, and I discover it faster than most people.
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@Magdoll
Liz Tseng
3 years
What can we learn about the transcript-level changes in hibernating v active brown bears using @PacBio Iso-Seq? Read this preprint by @joannalkelley @JG_Underwood , I and others! Quick thread below /1
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@Magdoll
Liz Tseng
2 years
Want to know how to get from @PacBio (MAS-Seq) #singlecell Iso-Seq analysis to Seurat + cell clustering? See this #bioinformatics tutorial!
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@Magdoll
Liz Tseng
8 months
How to tell I'm a former computer scientist / bioinformatician - I name my Word docs without spaces and use underscore and capitalization to separate words. XDDDD
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@Magdoll
Liz Tseng
5 years
I’m talking tonight 725pm in #PAGXVIII single cell genomics session on single cell IsoSeq using @PacBio . Come talk to me about what single cell questions can be asked on 🌱 and animals. Talk slides will be online later! #pag2020
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@Magdoll
Liz Tseng
4 years
I hate perl. Can perl just disappear from the world?
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@Magdoll
Liz Tseng
4 years
Amazing preprint out of @hudsonalpha showing using @PacBio HiFi reads solving previously unsolved rare disease! In one case, 35bp duplication of CDKL5 exon 3 resulted in frameshift.
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@Magdoll
Liz Tseng
2 years
Hey there #Bioinformatics folks looking for a job, I have an academic PI friend looking to hire bioinfx talent to work on long read ( @PacBio Iso-Seq) + other omics. International candidates welcome! no job req yet so for now DM me to be connected. RT appreciated ❤️
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@Magdoll
Liz Tseng
3 years
holy shit 1 MIN drosophila assembly and 10 MIN human assembly on @PacBio HiFi O____O
@RayanChikhi
Rayan Chikhi
3 years
Here is our preprint “Minimizer-space de Bruijn graphs”, that will be presented at RECOMB ’21
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@Magdoll
Liz Tseng
4 years
Reading the @SangerToL genome book w my kid this morning! Beautiful illustrations by @ATJCagan !
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@Magdoll
Liz Tseng
2 months
From @mrvollger (Stergachis lab): analysis of haplotype-resolved @PacBio HiFi FiberSeq genome reveals >1,000 regulatory elements with haplotype-selective chromatin accessibility (HSCA), with HLA being the most diverse locus. Accurate quantification of chromatin accessibility
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@Magdoll
Liz Tseng
3 years
While I'm going down memory lane today...this is probably the best moments from 10 years ago, when I sang the national anthem for a Mariners game. Ah, when I was young XDDD
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@Magdoll
Liz Tseng
4 years
A small but hopefully still useful potato pan-transcriptome dataset (in which I helped out w the @PacBio Iso-Seq portion). I'm really looking forward to seeing more pan-transcriptomes!
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@Magdoll
Liz Tseng
1 year
Are mixed @PacBio socks a blasphemy? 😝
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@Magdoll
Liz Tseng
9 months
It’s Wednesday.
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@Magdoll
Liz Tseng
2 months
Targeted @PacBio Iso-Seq identifies novel SNCA transcripts in human dopaminergic neurons, many with novel UTRs and encodes novel peptides, and used to design antisense oligonucleotides (ASO) leading to the effective reversal of Parkinson's Disease (PD) pathology
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@Magdoll
Liz Tseng
3 years
Fantastic preprint! Deep @PacBio Iso-Seq+RNA-Seq+mass spec comparative transcriptomics (human + great apes + macaque) finds species-specific isoforms/exonization enriched for immune genes and under positive selection. This is how it's done!
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@Magdoll
Liz Tseng
1 month
Microflora Danica: largest microbiome dataset to date using short + long reads for metagenomics, 16S amplion and rRNA operon sequencing of the Danish microbiome. 449 rep samples (14.9 million bacterial and 13.4 million eukaryotic rRNA ~4-4.5kb operon) using @PacBio . This is
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@Magdoll
Liz Tseng
3 years
I'm giving a @PacBio Iso-Seq webinar tonight ...in Mandarin. The last time I spoke any science in Mandarin was pre-pandemic. Current mood:
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@Magdoll
Liz Tseng
3 years
Korlach presents the (often glossed over but critical) #bioinformatics workflow for @PacBio HiFi genome for SV detection. #AGBT21
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@Magdoll
Liz Tseng
5 years
The most unique question I got asked today standing at my Alzheimer’s brain poster: “So this is from postmortem brain, right?” Me: “Uh, yes...?” I mean what is the alternative? Not postmortem brain??!! 🤯😱 #ASHG19
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@Magdoll
Liz Tseng
4 years
Want to find the latest and greatest @PacBio dataset? We've started compiling one here!
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@Magdoll
Liz Tseng
5 months
The new @PacBio Kinnex kits makes long-read RNA sequencing scalable - what's the magic? This animation explains the technology behind Kinnex. Kinnex is based on the MAS-Seq method for concatenating smaller amplicons (cDNA or 16S) into longer fragments that can fully utilize HiFi
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@Magdoll
Liz Tseng
9 months
Come see my @PacBio Kinnex full-length RNA #ASHG23 poster! I’ll be there tomorrow Sat 215-415pm
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@Magdoll
Liz Tseng
7 years
Wrote a quick minimap2 for Iso-Seq guide and did a minimap2 vs GMAP comparison. Would love to have extra pairs of eyes on this, data is public:
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@Magdoll
Liz Tseng
2 years
Paper thread time! Can @PacBio Iso-Seq data be used to identify SNVs and find allele-specfic isoform information? Yes! And here's the list of pubs off top of my head: /1
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@Magdoll
Liz Tseng
4 years
I wrote ANGEL years ago for ORF prediction from long read data that can handle errors (and also handle alternative ORFs). I have mixed feelings about its continuing utility, but this weekend I said heck - I'm updating it to Py3. #Bioinformatics @PacBio
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@Magdoll
Liz Tseng
3 months
Paraphase: a @PacBio #bioinformatics tool for haplotyping segmental duplication genes. Applied to 160 locus, resolved copy numbers, de novo mutations, pseudogenes, low diversity gene example AMY1 as shown below.
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@Magdoll
Liz Tseng
2 years
Congrats to @em_ka_gu & others for publishing ggtranscript (R package for full-length isoform viz)! #bioinformatics @PacBio
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@Magdoll
Liz Tseng
4 years
Macaque genome+annotation updated with @PacBio ! I AM SO STOKED
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@Magdoll
Liz Tseng
4 years
Want to know which DNA extraction kit to use for @PacBio sequencing? We have a tech note for that!
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