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Neandertal Introgression Sheds Light on Modern Human Endocranial Globularity

  • Philipp Gunz (Corresponding author)
  • , Amanda K. Tilot
  • , Katharina Wittfeld
  • , Alexander Teumer
  • , Chin Yang Shapland
  • , Theo G.M. van Erp
  • , Michael Dannemann
  • , Benjamin Vernot
  • , Simon Neubauer
  • , Tulio Guadalupe
  • , Guillén Fernández
  • , Han G. Brunner
  • , Wolfgang Enard
  • , James Fallon
  • , Norbert Hosten
  • , Uwe Völker
  • , Antonio Profico
  • , Fabio Di Vincenzo
  • , Giorgio Manzi
  • , Janet Kelso
  • Beate St. Pourcain, Jean Jacques Hublin, Barbara Franke, Svante Pääbo, Fabio Macciardi, Hans J. Grabe, Simon E. Fisher (Corresponding author)

Publications: Contribution to journalArticlePeer Reviewed

Abstract

One of the features that distinguishes modern humans from our extinct relatives and ancestors is a globular shape of the braincase [1, 2, 3, 4]. As the endocranium closely mirrors the outer shape of the brain, these differences might reflect altered neural architecture [4, 5]. However, in the absence of fossil brain tissue, the underlying neuroanatomical changes as well as their genetic bases remain elusive. To better understand the biological foundations of modern human endocranial shape, we turn to our closest extinct relatives: the Neandertals. Interbreeding between modern humans and Neandertals has resulted in introgressed fragments of Neandertal DNA in the genomes of present-day non-Africans [6, 7]. Based on shape analyses of fossil skull endocasts, we derive a measure of endocranial globularity from structural MRI scans of thousands of modern humans and study the effects of introgressed fragments of Neandertal DNA on this phenotype. We find that Neandertal alleles on chromosomes 1 and 18 are associated with reduced endocranial globularity. These alleles influence expression of two nearby genes, UBR4 and PHLPP1, which are involved in neurogenesis and myelination, respectively. Our findings show how integration of fossil skull data with archaic genomics and neuroimaging can suggest developmental mechanisms that may contribute to the unique modern human endocranial shape.
Original languageEnglish
Pages (from-to)120-127.e5
Number of pages13
JournalCurrent Biology
Volume29
Issue number1
DOIs
Publication statusPublished - 7 Jan 2019
Externally publishedYes

Funding

BIG is part of Cognomics, supported by the Donders-Centre for Cognitive Neuroimaging, Departments of Human-Genetics and Cognitive Neuroscience (Radboud University Medical Centre), MPI for Psycholinguistics. Additional funding: BBMRI-NL , Hersenstichting-Nederland , Netherlands Organisation for Scientific Research (NWO), FP7/2007–2013 : 602450 (IMAGEMEND) and 602805 (Aggressotype), NIH-U54-EB020403 . SHIP funded by BMBF Germany ( 01ZZ9603 , 01ZZ0103 , 01ZZ0403 , 03IS2061A , 03ZIK012 ), Federal State, Ministry of Cultural Affairs & Social Ministry of Mecklenburg-West Pomerania, Siemens Healthineers. Thanks to InterSystems (Caché-Campus), German Research Foundation ( GR-1912/5-1 ), Max Planck Society , Nomis Foundation (to S.P.), and NIH 1-U24-RR021992 and 1-U24-RR025736-01 . Funding sources had no role in study design, data collection, analysis, and interpretation. We thank the anonymous referees for detailed and constructive feedback that helped improve the manuscript.

Austrian Fields of Science 2012

  • 106056 Biological anthropology

Keywords

  • basal ganglia
  • brain shape
  • cerebellum
  • evolution
  • gene expression
  • genetic association
  • homo sapiens
  • magnetic resonance imaging
  • myelination
  • Neandertal
  • MYELINATION
  • BASAL GANGLIA
  • HOMO
  • SCHIZOPHRENIA
  • AKT
  • GENOME
  • EVOLUTION
  • SEQUENCE
  • ASSOCIATION
  • PHLPP

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