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The writer dismissed criticism that another version of the story was not needed in a post on the BBC TV Blog.
"Happily for us, the BBC were immediately excited at the idea of modern Sherlock Holmes," he said.
"Some might think that's a depressing indicator of our major broadcaster falling back on the most familiar of fictional archetypes, but it isn't. Sherlock Holmes may be the most filmed character in all fiction but to reinvent him for a new audience - as well as fans - is not just thrilling and exciting, it's an honour."
The three-part series, created by Gatiss and Doctor Who showrunner Steven Moffat, sees Benedict Cumberbatch take on the role of the famous detective.
Gatiss added: "From the very outset, what excited us was the very rare chance to go right back to the beginning. To get to the heart of the characters."
The first episode of Sherlock airs on Sunday at 9pm on BBC One.
> 'Sherlock' star dismisses 'Who' comparisons
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