Mutations in DNA polymerase δ subunit 1 co-segregate with CMD2-type resistance to Cassava Mosaic Geminiviruses

Yi Wen Lim, Ben N. Mansfeld, Pascal Schläpfer, Kerrigan B. Gilbert, Narayanan N. Narayanan, Weihong Qi, Qi Wang, Zhenhui Zhong, Adam Boyher, Jackson Gehan, Getu Beyene, Zuh Jyh Daniel Lin, Williams Esuma, Suhua Feng, Christelle Chanez, Nadine Eggenberger, Gerald Adiga, Titus Alicai, Steven E. Jacobsen, Nigel J. TaylorWilhelm Gruissem, Rebecca S. Bart

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Cassava mosaic disease (CMD) suppresses cassava yields across the tropics. The dominant CMD2 locus confers resistance to cassava mosaic geminiviruses. It has been reported that CMD2-type landraces lose resistance after regeneration through de novo morphogenesis. As full genome bisulfite sequencing failed to uncover an epigenetic mechanism for this loss of resistance, whole genome sequencing and genetic variant analysis was performed and the CMD2 locus was fine-mapped to a 190 kilobase interval. Collectively, these data indicate that CMD2-type resistance is caused by a nonsynonymous, single nucleotide polymorphism in DNA polymerase δ subunit 1 (MePOLD1) located within this region. Virus-induced gene silencing of MePOLD1 in a CMD-susceptible cassava variety produced a recovery phenotype typical of CMD2-type resistance. Analysis of other CMD2-type cassava varieties identified additional candidate resistance alleles within MePOLD1. Genetic variation of MePOLD1, therefore, could represent an important genetic resource for resistance breeding and/or genome editing, and elucidating mechanisms of resistance to geminiviruses.

Original languageEnglish
Article number3933
JournalNature communications
Issue number1
StatePublished - Dec 2022


Dive into the research topics of 'Mutations in DNA polymerase δ subunit 1 co-segregate with CMD2-type resistance to Cassava Mosaic Geminiviruses'. Together they form a unique fingerprint.

Cite this