Lior Pachter

中文導讀

Lior Pachter(Caltech)是 RNA velocity 最公開、最直白的 skeptic。他在 X 上講 velocity-on-UMAP 是 “biological gobbledygook”,反覆放大「velocity field 不可靠 / 是 artifact」的論文。他的組 (含 GennadyGorin)從 chemical master equation / normalization 的 biophysics 角度質疑 velocity——跟 JianhuaXing 殊途同歸,都打 physical-time-grounding 那個洞(見 velocity-skepticism)。

Who

PI at Caltech; computational biology / single-cell methods. The most public, blunt RNA velocity skeptic. Lab includes GennadyGorin (biophysics-of-velocity).

Position

• “Putting arrows on UMAPs (RNA velocity) is biological gobbledygook” (X, 2025-08-08), amplifying the velocity-benchmark-17studies benchmark — note his gloss is harsher than the benchmark’s own measured abstract (“limitations and challenges”); keep that distinction when citing.
• Constructive side: senior author on Monod (monod-gorin, with GennadyGorin) — CME-based stochastic modeling that minimizes distortive normalization. So the Pachter-lab critique is paired with a positive program, not pure negation.
• The biophysics pole of velocity-skepticism, converging with JianhuaXing’s dynamical-systems critique from a different lineage.

Related

velocity-skepticism · GennadyGorin · monod-gorin · velocity-benchmark-17studies · JianhuaXing · physical-time-grounding · RNA velocity · velocity-discourse-2025-2026