Predicted to enable mannose-1-phosphate guanylyltransferase activity. Predicted to be involved in biosynthetic process. Predicted to be located in cytosol. Predicted to be active in cytoplasm. Human ortholog(s) of this gene implicated in alacrima, achalasia, and impaired intellectual development syndrome. Orthologous to human GMPPA (GDP-mannose pyrophosphorylase A). [provided by Alliance of Genome Resources, Apr 2022]