ADGRL1 haploinsufficiency causes a variable spectrum of neurodevelopmental disorders in humans and alters synaptic activity and behavior in a mouse model

Vitobello, Antonio, Mazel, Benoit, Lelianova, Vera G., Zangrandi, Alice, Petitto, Evelina, Suckling, Jason, Salpietro, Vincenzo, Meyer, Robert, Elbracht, Miriam, Kurth, Ingo, and others. (2022) ADGRL1 haploinsufficiency causes a variable spectrum of neurodevelopmental disorders in humans and alters synaptic activity and behavior in a mouse model. American Journal of Human Genetics, 109 (8). pp. 1436-1457. ISSN 0002-9297. (doi:10.1016/j.ajhg.2022.06.011) (KAR id:95530)

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Official URL: https://doi.org/10.1016/j.ajhg.2022.06.011

Abstract

ADGRL1/latrophilin-1, a well-characterized adhesion G protein-coupled receptor, has been implicated in synaptic development, maturation and activity. However, the role of ADGRL1 in human disease has been elusive. Here, we describe 10 individuals with variable neurodevelopmental features including developmental delay, intellectual disability, attention deficit hyperactivity and autism spectrum disorders, and epilepsy, all featuring heterozygous variants in ADGRL1. In vitro, human ADGRL1 variants expressed in neuroblastoma cells showed faulty ligand-induced regulation of intracellular Ca2+ influx, consistent with haploinsufficiency. In vivo, Adgrl1 was knocked out in mice and studied on two genetic backgrounds. On a non-permissive background, mice carrying a heterozygous Adgrl1 null allele exhibited neurological and developmental abnormalities while homozygous mice were non-viable. On a permissive background, the null allele also appeared at sub-Mendelian frequency, but many Adgrl1 null mice survived the gestation and reached adulthood. The Adgrl1-/- mice demonstrated stereotypic behaviors, sexual dysfunction, bimodal extremes of locomotion, augmented startle reflex and attenuated pre-pulse inhibition, which responded to risperidone. Ex vivo synaptic preparations displayed increased spontaneous exocytosis of dopamine, acetylcholine and glutamate, but Adgrl1-/- neurons formed synapses in vitro poorly. Overall, our findings demonstrate that ADGRL1 haploinsufficiency leads to consistent developmental, neurological and behavioral abnormalities in mice and humans.

Item Type:	Article
DOI/Identification number:	10.1016/j.ajhg.2022.06.011
Uncontrolled keywords:	ADGRL1, Adgrl1 knockout mice, developmental delay, neuropsychiatric disorders, epilepsy
Subjects:	R Medicine
Divisions:	Divisions > Division of Natural Sciences > Medway School of Pharmacy
Depositing User:	Gurprit Lall
Date Deposited:	24 Jun 2022 05:52 UTC
Last Modified:	29 Jan 2023 00:00 UTC
Resource URI:	https://kar.kent.ac.uk/id/eprint/95530 (The current URI for this page, for reference purposes)

University of Kent Author Information

Petitto, Evelina.

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CReDIT Contributor Roles:

Benlaouer, Ouafa.

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Lall, Gurprit S..

Creator's ORCID:	https://orcid.org/0000-0003-3725-4795
CReDIT Contributor Roles:

Ushkaryov, Yuri.

Creator's ORCID:	https://orcid.org/0000-0002-5712-8297
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