Genetics in Medicine Open (Jan 2024)

Regulatory elements in SEM1-DLX5-DLX6 (7q21.3) locus contribute to genetic control of coronal nonsyndromic craniosynostosis and bone density-related traits

  • Paola Nicoletti,
  • Samreen Zafer,
  • Lital Matok,
  • Inbar Irron,
  • Meidva Patrick,
  • Rotem Haklai,
  • John Erol Evangelista,
  • Giacomo B. Marino,
  • Avi Ma’ayan,
  • Anshuman Sewda,
  • Greg Holmes,
  • Sierra R. Britton,
  • Won Jun Lee,
  • Meng Wu,
  • Ying Ru,
  • Eric Arnaud,
  • Lorenzo Botto,
  • Lawrence C. Brody,
  • Jo C. Byren,
  • Michele Caggana,
  • Suzan L. Carmichael,
  • Deirdre Cilliers,
  • Kristin Conway,
  • Karen Crawford,
  • Araceli Cuellar,
  • Federico Di Rocco,
  • Michael Engel,
  • Jeffrey Fearon,
  • Marcia L. Feldkamp,
  • Richard Finnell,
  • Sarah Fisher,
  • Christian Freudlsperger,
  • Gemma Garcia-Fructuoso,
  • Rhinda Hagge,
  • Yann Heuzé,
  • Raymond J. Harshbarger,
  • Charlotte Hobbs,
  • Meredith Howley,
  • Mary M. Jenkins,
  • David Johnson,
  • Cristina M. Justice,
  • Alex Kane,
  • Denise Kay,
  • Arun Kumar Gosain,
  • Peter Langlois,
  • Laurence Legal-Mallet,
  • Angela E. Lin,
  • James L. Mills,
  • Jenny E.V. Morton,
  • Peter Noons,
  • Andrew Olshan,
  • John Persing,
  • Julie M. Phipps,
  • Richard Redett,
  • Jennita Reefhuis,
  • Elias Rizk,
  • Thomas D. Samson,
  • Gary M. Shaw,
  • Robert Sicko,
  • Nataliya Smith,
  • David Staffenberg,
  • Joan Stoler,
  • Elizabeth Sweeney,
  • Peter J. Taub,
  • Andrew T. Timberlake,
  • Jolanta Topczewska,
  • Steven A. Wall,
  • Alexander F. Wilson,
  • Louise C. Wilson,
  • Simeon A. Boyadjiev,
  • Andrew O.M. Wilkie,
  • Joan T. Richtsmeier,
  • Ethylin Wang Jabs,
  • Paul A. Romitti,
  • David Karasik,
  • Ramon Y. Birnbaum,
  • Inga Peter

Journal volume & issue
Vol. 2
p. 101851

Abstract

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Purpose: The etiopathogenesis of coronal nonsyndromic craniosynostosis (cNCS), a congenital condition defined by premature fusion of 1 or both coronal sutures, remains largely unknown. Methods: We conducted the largest genome-wide association study of cNCS followed by replication, fine mapping, and functional validation of the most significant region using zebrafish animal model. Results: Genome-wide association study identified 6 independent genome-wide-significant risk alleles, 4 on chromosome 7q21.3 SEM1-DLX5-DLX6 locus, and their combination conferred over 7-fold increased risk of cNCS. The top variants were replicated in an independent cohort and showed pleiotropic effects on brain and facial morphology and bone mineral density. Fine mapping of 7q21.3 identified a craniofacial transcriptional enhancer (eDlx36) within the linkage region of the top variant (rs4727341; odds ratio [95% confidence interval], 0.48[0.39-0.59]; P = 1.2E−12) that was located in SEM1 intron and enriched in 4 rare risk variants. In zebrafish, the activity of the transfected human eDlx36 enhancer was observed in the frontonasal prominence and calvaria during skull development and was reduced when the 4 rare risk variants were introduced into the sequence. Conclusion: Our findings support a polygenic nature of cNCS risk and functional role of craniofacial enhancers in cNCS susceptibility with potential broader implications for bone health.

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