Neuroligins and Neurodevelopmental Disorders: X-Linked Genetics.
Level 5 - mechanism / opinion, no new human data
Narrative review of preclinical and mechanistic literature without systematic search criteria
PubMed 32848696 · doi:10.3389/fnsyn.2020.00033
What was done
The authors conducted a narrative review examining the role of X-linked neuroligins, specifically NLGN3 and NLGN4 (along with Y-linked NLGN4Y), in neurodevelopmental conditions such as autism spectrum disorder (ASD) and intellectual disability (ID). The review evaluates evidence regarding their synaptic functions derived from rodent models and human-derived differentiated neurons.
What was found
The abstract provides no quantitative data or specific numerical effect sizes. It reports that sex-linked neuroligins NLGN3 and NLGN4X, along with NLGN4Y, serve as postsynaptic cell adhesion molecules strongly linked to ASD and ID pathogenesis, yet are frequently omitted from large genome sequencing analyses that exclude sex chromosomes.
Why it matters
Highlighting X-linked synaptic genes like NLGN3 and NLGN4 helps address the understudied genetics of sex chromosomes in neurodevelopmental disorders, which is particularly relevant given the male-skewed prevalence of ASD.
Limits
As a narrative review, it lacks a systematic search methodology, pre-specified inclusion criteria, and formal risk-of-bias evaluation. Findings rely largely on preclinical rodent models and in vitro human-derived neuronal systems, which may not fully capture complex human clinical phenotypes.
Cited by
- supports Neuroligins are cell adhesion molecules involved in synapse formation, and humans have distinct homologous copies on both the X and Y chromosomes (NLGN4X and NLGN4Y).