Predicted to enable G-rich strand telomeric DNA binding activity and telomerase inhibitor activity. Predicted to be involved in regulation of telomere maintenance via telomerase and telomere capping. Predicted to act upstream of or within telomere maintenance. Predicted to be located in chromosome, telomeric region and nucleus. Predicted to be part of nuclear telomere cap complex. Is expressed in several structures, including blastomere; digestive system; gill; heart; and ovary. Human ortholog(s) of this gene implicated in colorectal cancer; familial melanoma; hepatocellular carcinoma; lung cancer; and ovarian cancer. Orthologous to human POT1 (protection of telomeres 1).