Complete mitochondrial genome of the marine red alga Grateloupia angusta (Halymeniales).

The first complete mitochondrial genome (27,943 bp) of the halymenialean red alga, Grateloupia angusta, was sequenced. The circular mitogenome contains 47 genes, including 26 protein-coding, 19 tRNA and 2 rRNA genes. The rps3 and rpl16 genes are overlapped by 7 bp. The majority of protein-coding genes (17 of 26 genes) use typical ATG start codon, however, 9 genes use alternative start codons such as ATT, AAT, TTA and TTG. The G. angusta mitogenome shows a significant difference to that of Chondrus crispus (Gigartinales) in gene synteny and tRNA compositions.