Can the following variant mutations in npc1 gene cause disease: snps c.644a>g, c.1926g>c, c.2572a>g, c.2793c>t, c.2911+28t>c, c.3754+34a>g, c.3797g>a?

Love the question. Nuclear polymorphisms are interesting. The more we look, the more we find. If you are seriously ill there may be gene mutations found on testing. Whether these snps are cause for disease or just incidental is still a mystery. If you demand a cause for disease, they are a possibility. There is nothing to do about it. Without any disease, finding these snps on testing does not predict disease.