Lior Pachter @lpachter
Bren Professor of Computational Biology @caltech. Blog at https://t.co/FFQzhEsmhi. Tweets represent my views, not my employer's. #methodsmatter pachterlab.github.io Pasadena, CA Joined April 2009-
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A funny thing happened on the way to routine single nucleus ATAC-seq analysis…and after scratching at it for longer than we wanted, we wrote a paper about what we found. This is a 🧵 about our little paper...(sorry long) biorxiv.org/content/10.110… 1/
Inspired by @lpachter and team's exploration of scRNA-seq pipelines, we face similar challenges in scATAC-seq, only magnified! After 5 years of tackling these inconsistencies with my advisor @JunhyongKim , Here is a summary (and some solutions😃) 1/n #Genomics #Bioinformatics
Inspired by @lpachter and team's exploration of scRNA-seq pipelines, we face similar challenges in scATAC-seq, only magnified! After 5 years of tackling these inconsistencies with my advisor @JunhyongKim , Here is a summary (and some solutions😃) 1/n #Genomics #Bioinformatics
So, seqspec has been published. This is a good opportunity to remind everybody that your count matrix, R object, h5ad etc are NOT your raw data. Raw data are fastq files which are only useful when you know the content of your reads. Then ... 1/7 academic.oup.com/bioinformatics…
@MCATstudySesh @NatureMicrobiol Thank you, and you are absolutely right. We can now integrate decades of data on chemotaxis, and this comprehensive understanding opens up numerous exciting avenues. I have discussed some of these in a 'Behind the Paper' blog post here: go.nature.com/3xLFcWr
(1/3) Excited to share our newest publication!! Fun collaboration with the Chen and Severinov labs to investigate how the fluoride riboswitch rearranges a pseudoknot to form a terminator. See movie generated by @elisew00 and Alan Chen (@TheRNAInstitute) academic.oup.com/nar/article/do…
In order to further the development of an open database of scientific illustrations for the life sciences we have now set up a non-profit under the umbrella of @OC_Europe 1/ opencollective.com/bioicons
Our paper "A machine readable specification for genomics assays" is now published in Bioinformatics, @OUPBioinfo. In short, we present a lightweight file format and command-line tool to document the structure of sequencing reads. Coauthored with @XiChenUoM and @lpachter. Paper:…
I am shocked to learn that @NCBI has no documentation on the SRA file format. An example of good transparency (the source code is available) but poor usability (a major barrier to building tools to work directly with SRA files). github.com/ncbi/sra-tools…
I am shocked to learn that @NCBI has no documentation on the SRA file format. An example of good transparency (the source code is available) but poor usability (a major barrier to building tools to work directly with SRA files). github.com/ncbi/sra-tools… https://t.co/ef5ORN8lF5
@lpachter p values are for getting tenure, not figuring out truth.
@eilatg Lots of good wave suggestions. I recommend James’s “A Student's Guide to Fourier Transforms” as a super clear intro to Fourier methods. Winning opener: “Showing a Fourier transform to a physics student generally produces the same reaction as showing a crucifix to Count Dracula.”
We have a winner! The plot has R^2 = 0.0067. p = 0.01. @leonidmirny guessed R^2 = 0.01, p = 0.01. Spot on! I made this plot by writing a program to find examples by shifting initially random points towards a line close to 0 (similar to the datasaurus approach).
We have a winner! The plot has R^2 = 0.0067. p = 0.01. @leonidmirny guessed R^2 = 0.01, p = 0.01. Spot on! I made this plot by writing a program to find examples by shifting initially random points towards a line close to 0 (similar to the datasaurus approach).
I've noticed it's becoming increasingly common in genomics to report results of regressions with ridiculously low correlation as "significant" based on a tiny p-value (for the hypothesis that the slope = 0). Can you guess R^2, the p-value, and where the data below was published?
Another paper on utility of polygenic risk scores: nature.com/articles/s4146… tl;dr: polygenic risk scores have no utility.
A not so tacit acknowledgment that "the Human Cell Atlas [project has]... failed" 👀
A not so tacit acknowledgment that "the Human Cell Atlas [project has]... failed" 👀
@lpachter Fun fact: Vampire bat oronasal-expressed isoform of TRPV1 (ortholog to our heat/pain/capsaicin receptor) melt-refolds at ~temperature of cool night/air close to another living mammal... Basically, their victims smell/taste spicy-hot good to them.
"A correlation coefficient of > 0.1 was used as the criterion of a validated model" That's r^2 = 0.01 👀
Startup idea: mine the ghost proteome in vampire bats, specifically looking for homologs of the Arabidopsis WEREWOLF gene (in order to unlock the secrets of longevity in humans).
Ugh. Yet another confirmation that the tool used to preprocess single-cell RNA-seq really matters. In this case a comparison of some split-seq quantification tools. Ugh. bmcgenomics.biomedcentral.com/articles/10.11…
Fabian Theis @fabian_theis
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28K Followers 383 Following Physicist, Ergodicity Economics @LdnMathLab. External Professor @sfiscience. Blog and mailing list: https://t.co/0K11DFH0W2Comment motivated by single cell RNA seq, but applies throughout the sciences
An Icelandic drama in 3 acts
@lpachter Me today showing your tweet to my class during journal club where the paper discussed showed a "significant correlation" with R^2=0.06 and P=0.001.
Today the one and only @anamariaelek defended her thesis, the first PhD in our group. Many thanks to the commitee members @Chema_MD @larsplus and @MargaridaMCM
A funny thing happened on the way to routine single nucleus ATAC-seq analysis…and after scratching at it for longer than we wanted, we wrote a paper about what we found. This is a 🧵 about our little paper...(sorry long) biorxiv.org/content/10.110… 1/
Inspired by @lpachter and team's exploration of scRNA-seq pipelines, we face similar challenges in scATAC-seq, only magnified! After 5 years of tackling these inconsistencies with my advisor @JunhyongKim , Here is a summary (and some solutions😃) 1/n #Genomics #Bioinformatics
The choice of whether to use Seurat or Scanpy for single-cell RNA-seq analysis typically comes down to a preference of R vs. Python. But do they produce the same results? In biorxiv.org/content/10.110… w/ @Josephmrich et al. we take a close look. The results are 👀 1/🧵
I'm so happy for this. Katie is one of the scientists I admire the most, for her science, kindness, and leadership. I am incredibly fortunate to have her as a colleague, collaborator, and friend.
Katie Pollard has been named a lifetime @aaas Fellow for her pioneering work in computational biology, bioinformatics, and genomics. Read more about the award and Pollard's career on our website 👉 bit.ly/3UnwMgY
So, seqspec has been published. This is a good opportunity to remind everybody that your count matrix, R object, h5ad etc are NOT your raw data. Raw data are fastq files which are only useful when you know the content of your reads. Then ... 1/7 academic.oup.com/bioinformatics…
@MCATstudySesh @NatureMicrobiol Thank you, and you are absolutely right. We can now integrate decades of data on chemotaxis, and this comprehensive understanding opens up numerous exciting avenues. I have discussed some of these in a 'Behind the Paper' blog post here: go.nature.com/3xLFcWr
The most memorable moment of an AI seminar a couple years back was when the speaker, without irony, drew a yellow box labeled “black box”
Black box models are named after “black boxes”… which to be clear are recording devices built into airplanes solely for the purpose of explainability.
(1/3) Excited to share our newest publication!! Fun collaboration with the Chen and Severinov labs to investigate how the fluoride riboswitch rearranges a pseudoknot to form a terminator. See movie generated by @elisew00 and Alan Chen (@TheRNAInstitute) academic.oup.com/nar/article/do…
In order to further the development of an open database of scientific illustrations for the life sciences we have now set up a non-profit under the umbrella of @OC_Europe 1/ opencollective.com/bioicons
I love techbro hubris. They 'solved' protein folding literally by relying on millions of hours of PhD level experiments to train their model. The only way to understand the universe at the Plank scale is also by experiments, not by the hallucinations of some AI #coolaid
Deepmind's Demis Hassabis at TED tonight When asked about Microsoft + OpenAI spending $100B to train their next model: "Google will have spent more than that over time. To get to AGI, you need a lot of compute. Google still has the most compute." "With protein folding, we did…
Our paper "A machine readable specification for genomics assays" is now published in Bioinformatics, @OUPBioinfo. In short, we present a lightweight file format and command-line tool to document the structure of sequencing reads. Coauthored with @XiChenUoM and @lpachter. Paper:…
The @NCBI Sequence Read Archive has no documentation for the SRA file format which is used to host its massive 31 Pb dataset. github.com/ncbi/sra-tools…
Much more about the properties of eigenvalues and eigenvectors when a matrix is perturbed by noise in each entry.
What, if anything, do you wish you had know in grad school?
@lpachter When I worked with cancer registry data (i.e., hundreds of thousands of records), we'd get small p-values even if the slope of the regression line was close to 0; the statistician explained that was a artifact of having a very large sample size.