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LINE-1 retrotransposons regulate the exit of human pluripotency and early brain development

Adami, A.; Garza, R.; Gerdes, P.; Johansson, P. A.; Dorazehi, F.; Koutounidou, S.; Castilla-Vallmanya, L.; Atacho, D. A. M.; Sharma, Y.; Johansson, J. G.; Tam, O.; Kirkeby, A.; Barker, R. A.; Gale Hammell, M.; Douse, C. H.; Jakobsson, J.

2025-01-17 developmental biology
10.1101/2025.01.17.633315 bioRxiv
Show abstract

Long interspersed nuclear element 1 (L1) retrotransposons represent a vast source of divergent genetic information. However, mechanistic analysis of whether and how L1s contribute to human developmental programs is lacking, in part due to the challenges associated with specific profiling and manipulation of human L1 expression. Here we show that thousands of hominoid-specific L1 integrants are expressed in human induced pluripotent stem cells and cerebral organoids. The activity of individual L1 promoters is surprisingly divergent and correlates with an active epigenetic state. Efficient on-target CRISPRi silencing of L1s revealed nearly a hundred co-opted L1-derived chimeric transcripts and L1 silencing resulted in changes in neural differentiation programs and reduced cerebral organoid size. Together, these data implicate L1s and L1-derived transcripts in hominoid-specific CNS developmental processes.

Published in Cell Genomics (predicted rank #22) · training set

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