KLF1: When less is more

Abstract

In this issue of Blood, Liu et al gain an understanding of phenotypic variability in hemoglobinopathies.1 They find that mutations in Krüppel-like factor-1 (KLF1) are significantly more prevalent in patients with β-thalassemia than previously recognized and correlate with a milder phenotype. This supports the emerging concept that monoallelic KLF1 mutations can play a modulatory role in hemoglobinopathies. © 2014 by The American Society of Hematology.