GTF2H4 and xeroderma pigmentosum: In the accompanying paper (51), we reported that the patient with XP-J (XP140BR) intrinsically expresses a pathogenic, C-terminally truncated form of p52 (p52ΔC) and exhibits only XP clinical manifestations without features of the TTD phenotype, despite the missing domain (also known as p8L) being essential for the interaction between p52 and p8 (55).