Prenatal consequences of GALT deficiency in a rat model of classic galactosemia.

GALT-null rat fetuses develop elevated galactose metabolites and growth delays, but maternal heterozygosity can partially mitigate these prenatal effects.

• Why it matters: Understanding prenatal factors influencing CG outcomes is crucial because long-term complications may originate in utero, yet the impact of maternal GALT status remains unclear.
• What they did: Using a GALT-null rat model, researchers crossed rats to produce fetuses with varying maternal GALT activity, measuring amniotic fluid galactitol levels and fetal growth at gestational day 21.
• The result: Fetuses within heterozygous or GALT-null dams showed elevated metabolites, but growth delays were only rescued when developing in heterozygous dams, suggesting maternal GALT status can influence prenatal disease severity.