Marcos Castro e Silva, PhD 🇧🇷's Avatar

Marcos Castro e Silva, PhD 🇧🇷

@macscastro.bsky.social

Postdoc fellow at @IBE_Barcelona @UPFBarcelona • Interested in how genomics can help us understand human history and evolution • he/him

103 Followers  |  341 Following  |  15 Posts  |  Joined: 24.11.2024  |  1.96

Latest posts by macscastro.bsky.social on Bluesky

Seeing how every effort has now materialized into lessons and teachings that truly benefit @ibe-barcelona.bsky.social scientists of all generations has been immeasurable. Thank you, @xavimartiperez.bsky.social, for co-leading this project.

16.06.2025 21:17 — 👍 6    🔁 3    💬 2    📌 0

Thank you @albanietoh.bsky.social and @xavimartiperez.bsky.social for putting the effort to organizing this workshop! 🙏

17.06.2025 09:28 — 👍 2    🔁 0    💬 0    📌 0
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Caçadores humanos podem ter sido os principais algozes das preguiças-gigantes Imagine uma paisagem no Pantanal ou no Pampa, com suas amplidões de vegetação rasteira, entrecortada por imensos animais de até 4 toneladas, as preguiças-gigantes. No litoral, seria possível encontrar...

Caçadores humanos podem ter sido os principais algozes das preguiças-gigantes. Análises evolutivas indicam que a disseminação de Homo sapiens pela América coincidiu com picos de extinção bit.ly/43dhPTf

#paleontologia #biodiversidade #evolução #zoologia

22.05.2025 21:26 — 👍 45    🔁 11    💬 2    📌 4

Obrigado Nikolas!

17.05.2025 13:57 — 👍 0    🔁 0    💬 0    📌 0
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La genética revela la extraordinaria historia de la población de Brasil La historia de Brasil, marcada por siglos de migraciones, mestizaje y desigualdad, también se refleja en su ADN. Por primera vez, un equipo internacional de científicos

www.lavanguardia.com/ciencia/2025...

16.05.2025 10:16 — 👍 0    🔁 0    💬 0    📌 0
Mapping the genome of the Brazilian population, with implications for healthcare For the first time, an international study under the joint leadership of Spain’s Institute of Evolutionary Biology (IBE), a joint centre of the Spanish National Research Council (CSIC)...

www.eurekalert.org/news-release...

16.05.2025 10:16 — 👍 0    🔁 0    💬 1    📌 0
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Massive DNA sequencing effort reveals how colonization shaped Brazil’s genetic diversity New study identifies thousands of new variants related to diseases

Here are some news articles about the paper: 👇

www.science.org/content/arti...

16.05.2025 10:16 — 👍 0    🔁 0    💬 1    📌 0
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Admixture’s impact on Brazilian population evolution and health Brazil, the largest Latin American country, is underrepresented in genomic research despite boasting the world’s largest recently admixed population. In this study, we generated 2723 high-coverage who...

Huge thanks to the incredible team behind this effort.
Proud to have contributed to the DNA do Brasil project and to shed light on Brazil’s rich genetic history.
🔗 Read the paper: science.org/doi/10.1126/...
🧵Thanks for reading! RTs appreciated. #genomics #Brazil #SciComm

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

Brazil’s complex genetic history matters—for public health, ancestry, and fairness in precision medicine. Including diverse and admixed populations in genomics isn’t just good science—it’s key to understanding and honoring Brazil’s past.

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

📉 Genomic data reveals the demographic toll of colonization:

Massive effective population size declines

Regional differences in genetic isolation

Long IBD segments in Amazonas (northern Brazilian state) reveal deep founder effects and recent inbreeding

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

🧬 We identified ancestry-specific regions under natural selection after admixture:

Genes linked to immune response (MHC/HLA), fertility, metabolism

Selection shaped by regional environments & disease burdens

Especially strong signals from Indigenous ancestry

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

🌍 Brazilian genomes are a mosaic of haplotypes from Indigenous American, African, and European ancestors.
We uncovered fine-scale structure — some individuals were formed by admixture between African populations that likely never met on the continent itself.

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

👩🏽‍🦱🧔🏻‍♂️ We reconstructed how admixture shaped Brazilian genomes:

Admixture peaked in the 18th–19th centuries

Initially: sex-biased mating (mostly European men + African/Indigenous women)

Now: ancestry-assortative mating dominates

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

💥 Of these new variants, >36,000 are potentially deleterious — affecting immunity, metabolism, and fertility.
Many are rare and ancestry-specific.
We found correlations between ancestry proportions and deleterious variant burden.

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

🧬 We generated 2,723 whole-genome sequences (avg. 35x coverage) from across Brazil's 5 regions: including urban, rural, and riverine populations.
This is one of the largest WGS datasets from Latin America.
And we found 8.7 million variants not seen in public datasets.

16.05.2025 10:01 — 👍 0    🔁 0    💬 1    📌 0

🇧🇷 Brazil is home to the world’s largest recently admixed population — shaped by millions of Europeans, enslaved Africans, and Indigenous peoples.
Yet, its genomic diversity remains underrepresented in global databases.
We set out to change that.

16.05.2025 10:01 — 👍 3    🔁 0    💬 1    📌 0
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Admixture’s impact on Brazilian population evolution and health Brazil, the largest Latin American country, is underrepresented in genomic research despite boasting the world’s largest recently admixed population. In this study, we generated 2723 high-coverage who...

🚨 Our new paper is out in Science!
We analyzed 2,723 high-coverage whole genomes from Brazilians to explore how five centuries of colonization, forced migration, and admixture have shaped genetic diversity and impacted health.
📄 science.org/doi/10.1126/...
🧵👇

16.05.2025 10:01 — 👍 45    🔁 16    💬 3    📌 1
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Maior análise de DNA já feita mostra que quase todos os brasileiros são miscigenados Pesquisa também aponta herança indígena mais substancial do que se imaginava antes

Quase todos os brasileiros são miscigenados, diz estudo

15.05.2025 15:03 — 👍 6    🔁 1    💬 0    📌 0
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Admixture’s impact on Brazilian population evolution and health Brazil, the largest Latin American country, is underrepresented in genomic research despite boasting the world’s largest recently admixed population. In this study, we generated 2723 high-coverage who...

Very proud of my colleagues and friends for their amazing publication out in Science today!

Nunes et al. "Admixture’s impact on Brazilian population evolution and health" www.science.org/doi/10.1126/...

@hunemeier.bsky.social @macscastro.bsky.social 👏

15.05.2025 18:04 — 👍 20    🔁 10    💬 0    📌 0

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