Palindromic GOLGA8 core duplicons promote chromosome 15q13.3 microdeletion and evolutionary instability

Francesca Antonacci, Megan Y. Dennis, John Huddleston, Peter H. Sudmant, Karyn Meltz Steinberg, Jill A. Rosenfeld, Mattia Miroballo, Tina A. Graves, Laura Vives, Maika Malig, Laura Denman, Archana Raja, Andrew Stuart, Joyce Tang, Brenton Munson, Lisa G. Shaffer, Chris T. Amemiya, Richard K. Wilson, Evan E. Eichler

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Recurrent deletions of chromosome 15q13.3 associate with intellectual disability, schizophrenia, autism and epilepsy. To gain insight into the instability of this region, we sequenced it in affected individuals, normal individuals and nonhuman primates. We discovered five structural configurations of the human chromosome 15q13.3 region ranging in size from 2 to 3 Mb. These configurations arose recently (â 1/40.5-0.9 million years ago) as a result of human-specific expansions of segmental duplications and two independent inversion events. All inversion breakpoints map near GOLGA8 core duplicons - a â 1/414-kb primate-specific chromosome 15 repeat that became organized into larger palindromic structures. GOLGA8-flanked palindromes also demarcate the breakpoints of recurrent 15q13.3 microdeletions, the expansion of chromosome 15 segmental duplications in the human lineage and independent structural changes in apes. The significant clustering (P = 0.002) of breakpoints provides mechanistic evidence for the role of this core duplicon and its palindromic architecture in promoting the evolutionary and disease-related instability of chromosome 15.

Original languageEnglish
Pages (from-to)1293-1302
Number of pages10
JournalNature Genetics
Volume46
Issue number12
DOIs
StatePublished - Dec 11 2014

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