NLGN4X and autism: A study in a small Finnish autism sample did not find any functional mutation of NLGN1, NLGN3, NLGN4, or NLNG4Y, although three common variants (rs1488545 in NLGN1, DXS7132 in NLGN3, and DXS996 in NLGN4) that showed minor association with ASDs were found.