What is the difference in characterization of Jocasta in Oedipus Rex and Desdemona in Othello?

While there are some similarities between Sophocles'
Jocasta and Shakespeare's Desdemona, there are some significant differences.  Both of
them support their spouses, but do so in different ways.  Desdemona's affirmation of
Othello's love causes her to break with her family and her social setting to live only
with and for him.  Once they leave together, she does not have much of a role in terms
of counsel or advice.  She loves him fully and with pure transparency, but the role of
Iago and Othello's own self doubt ends up subsuming him and reduces her to an object
upon which his insecurities are projected.  Jocasta is a bit more of an adviser or
counselor to Oedipus.  She is constantly advising him to not believe the prophecies, or
to not succumb to petty arguments with Creon.  At the same time, she does whatever she
can to shield him from the truth, invoking a maternal instinct, as well as defending her
own relationship with him.  Her counsel expires when the spiraling state of affairs
becomes too much for her.  Both depictions of women are different from one another
because they reflect different expressions of who what it means to be a spouse.  The
other significant difference would be their endings, in that one is killed by the hand
of another and the other is killed by her own hand.