Simon Fisher
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profsimonfisher.bsky.social
Simon Fisher
@profsimonfisher.bsky.social
Director of Language & Genetics at Max Planck Institute, Nijmegen.
Tracing the complex connections between genes, brains, speech & language.
Website: https://www.mpi.nl/people/fisher-simon-e
ORCID: https://orcid.org/0000-0002-3132-1996
Our 3 facets: vocal production learning = ability to modify vocalizations based on experience; language structure = systematic ways in which linguistic elements relate to one another; & social underpinnings = behaviours/processes that facilitate social interaction & enable cultural transmission.10/n
November 23, 2025 at 12:05 PM
Interacting processes operating on vastly different timescales (from milliseconds to millennia) shape emergence & properties of human language(s). Roles of biology & culture, & the complex interplay between them, can be empirically investigated in humans, nonhuman animals & computational models. 8/n
November 23, 2025 at 11:54 AM
Unboxing Schrödinger's cat.
November 3, 2025 at 9:57 PM
For a deeper dive into what's known about neural functions of FOXP2 & its interactors, see our review on “Molecular networks of the FOXP2 transcription factor in the brain” by Joery den Hoed et al, which also framed key questions for future investigation:
www.embopress.org/doi/full/10....
🗣️🧠🔬🧬 12/12
October 31, 2025 at 6:03 PM
The story began with a three-generation family in which 15 relatives had speech & language impairments. We found that all affected (but no unaffected) family members had inherited the same unusual FOXP2 variant, one that altered a key part of the encoded protein, interfering with its functions. 2/n
October 29, 2025 at 5:09 PM
More than two decades have passed since we discovered that rare disruptions of the FOXP2 gene disturb development of proficient speech/language skills. Today we know of multiple FOXP genes that are directly implicated in distinct brain-related conditions with differences in symptoms & severity.🧪 1/n
October 29, 2025 at 5:09 PM
Come join us for a 4-year PhD on effects of rare gene disruptions involved in speech disorder, investigated in human neuronal models (via gene-editing, tissue culture, brain organoids, high-res microscopy, transcriptomics, epigenomics).
More info: www.mpi.nl/imprs-phd-fe...
#AcademicJobs #PhDJobs
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October 22, 2025 at 3:43 PM
Help spread the word about developmental language disorder, a common yet often hidden condition that makes it hard for children to understand what's said to them & to articulate thoughts & feelings. Lots of helpful resources & information at radld.org.
#DLDday #DevLangDis @radld.bsky.social
October 17, 2025 at 9:34 AM
In the years that followed, rare FOXP2 disruptions have been found in multiple other families with problems in speech, language & behaviour, refining understanding of the associated disorder, while the impacts of its dysfunction have been studied in detail in animal models & cellular systems. 17/n
October 4, 2025 at 5:18 PM
Based on its DNA-binding motif, this was a novel FOX transcription factor, & it was given the official name FOXP2. Prior literature had linked pathogenic variants in other FOX genes to a range of diseases. Our work suggested FOXP2 dysfunction as one potential cause of speech/language disorder. 16/n
October 4, 2025 at 3:14 PM
When we sequenced this newly discovered section of the gene in the KE family, we found a single nucleotide variant (guanine-to-adenine) in all the affected members, yielding an amino-acid change (arginine-to-histidine) at a critical place in the FOX domain, predicted to disrupt its function. 15/n
October 4, 2025 at 2:28 PM
Then, another twist! Turned out that CAGH44 was mischaracterized by the team who had originally cloned it. Our data showed that the gene extends much further than they had thought. Reconstructing the entire locus, we found a key part encoding a forkhead box (FOX), a type of DNA-binding domain. 14/n
October 4, 2025 at 2:17 PM
This unrelated child had a translocation involving exchange of material between chromosomes 7 & 5. We mapped the chromosome 7 breakpoint to our region of interest, very close to CAGH44, a brain-expressed polyglutamine-tract gene. But alas we did not find any changes in CAGH44 in the KE family. 13/n
October 4, 2025 at 2:07 PM
Our genomic region of interest was big, only partially characterized & likely to include many unknown genes. It was 1998, some years before the Human Genome Project finished a first draft. As sections of sequence became available, I used bioinformatic approaches to build maps of the interval. 11/n
October 4, 2025 at 1:45 PM
But even as debates ensued on the nature of the disorder, DNA-based methods hadn’t yet been used to test if its inheritance was truly monogenic. By tracing transmission of genetic markers in the family, we confirmed involvement of a single locus, & localized it to one part of chromosome 7.
10/n
October 4, 2025 at 1:34 PM
The London team countered the claim; in-depth work by neuroscientists Faraneh Vargha-Khadem & @kateewatkins.bsky.social showed the most profound feature of the KE family disorder is impaired sequencing of mouth/face movements underlying speech, with multiple aspects of language also affected. 9/n
October 4, 2025 at 1:34 PM
Long before anyone started studying the DNA, reports of the family fueled controversy over existence of a dubious “grammar gene”. Extensive coverage had been given to linguist Myrna Gopnik’s claim of a selective deficit in grammar skills e.g. that KEs “lack a general rule for producing plurals”. 8/n
October 4, 2025 at 1:34 PM
Soon after we had begun building up cohorts for the project, Tony was contacted by Marcus Pembrey, a leading geneticist at London’s Institute of Child Health. His team had identified a 3-generation British family (codename KE) in which 15 relatives had problems with speech/language development. 6/n
October 4, 2025 at 1:34 PM
Twenty-four years ago today, our paper “A forkhead-domain gene is mutated in a severe speech and language disorder” was published: www.nature.com/articles/350....
A personal thread about the ups & downs of the journey we took to get to that point....1/n
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October 4, 2025 at 1:34 PM
Why does this matter? Sensational stories hailing a dramatic rewrite of human origins are regularly repurposed by some as a tool to undermine the legitimacy of evolution. Take this example of Mike Pence talking to US Congress way back in 2002. Full transcript: www.congress.gov/congressiona...
...4/n
September 27, 2025 at 1:43 PM
New analysis of a 1-million yr old fossil skull captured worldwide media attention this week, with many headlines saying it requires a complete rewrite/rethink of human evolution. This is an intriguing study & it's brilliant to see so much public enthusiasm for deciphering our origins, but....1/n 🧪
September 27, 2025 at 12:40 PM
This goes to eleven.
September 6, 2025 at 4:24 PM
Applications open for fully funded 4-yr positions in the unique interdisciplinary program of the @maxplanck.de School of Cognition. Pursue a passion for science at the forefront of fundamental & applied research, mentored by a network of world renowned researchers.🧪
cognition.maxplanckschools.org/en
September 4, 2025 at 12:08 PM
A reminder that there is no scientific basis for attempts to define people in terms of “good” or “bad” genes - these are discredited views in service of racist ideologies. For the consensus from the experts, see e.g. this 2020 @geneticssociety.bsky.social statement:
www.ashg.org/publications... 🧬🧪
August 29, 2025 at 5:48 PM
Saw this today and smiled.
Correlation or causation?
August 22, 2025 at 3:11 PM