Does gene therapy have ethically problematic effects on identity?

I shall discuss whether germline gene therapy and other genetic techniques applied at the preimplantation stage - in contrast to e.g. ordinary somatic therapy - affect our identity and, if so, whether this is ethically significant. So, I will not examine all the ethical questions these therapies raise. I will put aside such worries as: might not such therapies have unpredictable repercussions on the genepool? Might they not provide powerful weapons that political leaders might put to disastrous misuse?