What I am asking

What does Roman Catholic theology hold to be the nature of the original sin? If we consider the Tree of Knowledge, its fruit, and Adam and Eve partaking of it as all being metaphors, what is the meaning behind the metaphor? What exactly did Adam and Eve do that ran counter to God's command not to "eat of the Tree"?

To clarify, I am not seeking to identify the Original Sin in terms of the Seven Deadly Sins; Catholic dogma tells us that the sin was Pride. What I'm trying to do is identify the specific prideful thought or action that Adam and Eve committed which was sinful.

This question is being asked primarily to form the basis of another question I have posted.

What I am looking for

The ideal answer will contain citation of specific doctrines of the Roman Catholic Church regarding original sin, including:

• The degree of binding authority conferred by the Magisterium upon the teachings (i.e. solemn or ordinary, universal or non-universal).
• How the teachings were added to the deposit of faith (i.e. Sacred Scripture or Sacred Tradition).
  • Teachings derived from Sacred Scripture should also furnish quotation of the applicable verse(s) from a Catholic English Bible (i.e. an English-language translation of the Bible containing only the 73 canonical books and having the imprimatur of a Catholic bishop).
    • Teachings derived from Sacred Tradition should furnish quotations from the applicable conciliar canons or decrees, as well as links to the sources of their full texts.

What I am not looking for

• Discussion, analysis, or answers from non-Catholic perspectives.