The present invention provides a novel glycerol 3-phosphateacyltransferase gene and use thereof. The object of the present invention can be solved by providing a nucleic acid having a nucleotide sequence set forth in SEQ ID NO: 1, 4, or 8, SEQ ID NO: 3, 6, or 11, or SEQ ID NO: 7 or 12 and a mutant thereof. The present invention also provides a protein having an amino acid sequence set forth in SEQ ID NO: 2, 5, or 9 and a mutant thereof.