“…The remaining 47 papers were published after the seminal paper in 2015 which described seven epileptic patients with SLC6A1 variants ( Carvill et al, 2015 ). Of the 47 clinically relevant papers, two were focused on attention deficit disorder ( Merriman et al, 2015 ; Yuan et al, 2017 , p1), two researched a connection with alcoholism ( Adkins et al, 2015 ; Enoch et al, 2016 ), one found SLC6A1 variants related to Alzheimer’s disease ( Zhu et al, 2020 ), one focused on connections to anxiety ( Sarris et al, 2020 ), three were focused on somatic mutations in malignant tumors ( Eshragh et al, 2017 ; Chen et al, 2020 ; Wang et al, 2022 , p1), one focused on dystonia ( Zech et al, 2017 ), one included multiple gene deletions ( Dikow et al, 2014 ; Yuan et al, 2020 ), four reported SLC6A1 variants associated with schizophrenia ( Frankle et al, 2015 ; Hoftman et al, 2015 ; Zhao et al, 2016 ; Rees et al, 2020 ), three focused on other similar mental health disorders ( Demarest et al, 2019 ; Ahring et al, 2022 ; Knight et al, 2022 ), two described genetic testing technologies ( Schijns et al, 2020 ; Salinas et al, 2021 ), and two described general developmental and epileptic encephalopathies (DEEs) without specific description of patients with SLC6A1 mutation ( Schousboe et al, 2004 ; Guillen-Guio et al, 2018 ; Galer et al, 2020 ; Salinas et al, 2021 ). Only 25 papers included clinical description of patients with neurodevelopmental symptoms and DEEs, with a likely overlap of a few patients between these papers ( Supplementary Table 1 ).…”