• Camilla Fontana, Federica Marasca, Livia Provitera, Sara Mancinelli, Nicola Pesenti, Shruti Sinha, Sofia Passera, Sergio Abrignani, Fabio Mosca, Simona Lodato, Beatrice Bodega, and Monica Fumagalli.
• Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.
• Bmc Med. 2021 Feb 5; 19 (1): 42.

BackgroundPreterm birth affects almost 9-11% of newborns and is one of the leading causes of childhood neurodevelopmental disabilities; the underlying molecular networks are poorly defined. In neurons, retrotransposons LINE-1 (L1) are an active source of genomic mosaicism that is deregulated in several neurological disorders; early life experience has been shown to regulate L1 activity in mice.MethodsVery preterm infants were randomized to receive standard care or early intervention. L1 methylation was measured at birth and at hospital discharge. At 12 and 36 months, infants' neurodevelopment was evaluated with the Griffiths Scales. L1 methylation and CNVs were measured in mouse brain areas at embryonic and postnatal stages.ResultsHere we report that L1 promoter is hypomethylated in preterm infants at birth and that an early intervention program, based on enhanced maternal care and positive multisensory stimulation, restores L1 methylation levels comparable to healthy newborns and ameliorates neurodevelopment in childhood. We further show that L1 activity is fine-tuned in the perinatal mouse brain, suggesting a sensitive and vulnerable window for the L1 epigenetic setting.ConclusionsOur results open the field on the inspection of L1 activity as a novel molecular and predictive approach to infants' prematurity-related neurodevelopmental outcomes.Trial RegistrationClinicalTrial.gov ( NCT02983513 ). Registered on 6 December 2016, retrospectively registered.

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