STRAD Pseudokinases Regulate Axogenesis and LKB1 Stability

BACKGROUND: Neuronal polarization is an essential step of morphogenesis and connectivity in the developing brain. The serine/threonine kinase LKB1 is a key regulator of cell polarity, metabolism, tumorigenesis, and is required for axon formation. It is allosterically regulated by two related and evolutionarily conserved pseudokinases, STe20-Related ADapters (STRADs) α and β. The roles of STRADα and STRADβ in the developing nervous system are not fully defined, nor is it known whether they serve distinct functions. RESULTS: We find that STRADα is highly spliced and appears to be the primal STRAD paralog. We report that each STRAD is sufficient for axogenesis and promoting cell survival in the developing cortex. We also reveal a reciprocal protein-stabilizing relationship in vivo between LKB1 and STRADα, whereby STRADα specifically maintains LKB1 protein levels via cytoplasmic compartmentalization. CONCLUSIONS: We demonstrate a novel role for STRADβ in axogenesis and also show for the first time in vivo that STRADα, but not STRADβ, is responsible for LKB1 protein stability

Progress in Documented Early Identification and Intervention for Deaf and Hard of Hearing Infants – CDC’s Hearing Screening and Follow-up Survey, United States, 2006–2016

The national EHDI 1-3-6 goals state that all infants should be screened for hearing loss before 1 month of age; with diagnostic testing before 3 months of age for those who do not pass screening; and early intervention (EI) services before 6 months of age for those with permanent hearing loss. This report updates previous summaries of progress on these goals by U.S. states and territories. Data are based on the Hearing Screening and Follow-up Survey (HSFS) conducted annually by the Centers for Disease Control and Prevention for the years 2006–2016. Trends were assessed using 3-year moving averages, with rates of newborns lost to follow-up or lost to documentation (LTF/D) also examined. During this period, the percentage of infants screened before one month increased from 85.1% to 95.3%, while the percentage receiving diagnostic testing before three months increased from 19.8% to 36.6%, and the percentage of infants identified with permanent hearing loss enrolled in EI before six months increased from 25.1% to 47.2%. Percentages of infants who ultimately received screening, diagnostic testing, and early intervention services – regardless of timing – were higher. During this period, LTF/D declined from 42.1% to 31.3% for diagnostic testing, and 39.4% to 20.3% for EI services. Diagnoses of hearing loss recorded increased from 0.9 to 1.7 per 1,000 infants screened, likely reflecting improved data