3 years ago

A structural variant in the 5’-flanking region of the <i>TWIST2</i> gene affects melanocyte development in belted cattle

Marcos Sande, Julia Beck, Nivedita Awasthi Mishra, Rémy Bruggmann, Ekkehard Schütz, Stefan Rieder, Bertram Brenig, Daniel Wüthrich, Cord Drögemüller, Irene Keller, Heidi Signer-Hasler, Nadia Mercader, Vidhya Jagannathan, Ronald Rongen, Aldona Pieńkowska-Schelling, Steffi Demmel, Claude Schelling, Tosso Leeb, Robert N. Kelsh, Simon Moser

by Nivedita Awasthi Mishra, Cord Drögemüller, Vidhya Jagannathan, Irene Keller, Daniel Wüthrich, Rémy Bruggmann, Julia Beck, Ekkehard Schütz, Bertram Brenig, Steffi Demmel, Simon Moser, Heidi Signer-Hasler, Aldona Pieńkowska-Schelling, Claude Schelling, Marcos Sande, Ronald Rongen, Stefan Rieder, Robert N. Kelsh, Nadia Mercader, Tosso Leeb

Belted cattle have a circular belt of unpigmented hair and skin around their midsection. The belt is inherited as a monogenic autosomal dominant trait. We mapped the causative variant to a 37 kb segment on bovine chromosome 3. Whole genome sequence data of 2 belted and 130 control cattle yielded only one private genetic variant in the critical interval in the two belted animals. The belt-associated variant was a copy number variant (CNV) involving the quadruplication of a 6 kb non-coding sequence located approximately 16 kb upstream of the TWIST2 gene. Increased copy numbers at this CNV were strongly associated with the belt phenotype in a cohort of 333 cases and 1322 controls. We hypothesized that the CNV causes aberrant expression of TWIST2 during neural crest development, which might negatively affect melanoblasts. Functional studies showed that ectopic expression of bovine TWIST2 in neural crest in transgenic zebrafish led to a decrease in melanocyte numbers. Our results thus implicate an unsuspected involvement of TWIST2 in regulating pigmentation and reveal a non-coding CNV underlying a captivating Mendelian character.

Publisher URL: http://journals.plos.org/plosone/article

DOI: 10.1371/journal.pone.0180170

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