Sarada was probably born in Orochomaru's hideout since it seems Sarada's umbilical cord is in Karin desk which explains why she has no Konoha birth certificate. I don't think its confirmed who Sarada's mother is if this is true.
Suigetsu seems half sure that its Karin's DNA but I think the reason Kishimoto had Suigetsu do the DNA test was because if Orochimaru did the test he would make sure he knew who's DNA he was matching with Sarada's DNA.
If that was Karin's DNA in the desk it confirms that she is the mother. Below are the three options I see being confirmed by Sasuke or Orochimaru:
1. Sarada is a female clone made from 2 of Sasuke's X chromosomes
2. Sarada's mother is Karin
3. Sasuke created Sarada from his rinnegan powers
Kishi could have Orochimaru explain that Karin asked him to clone since she thought that having a clone of Sasuke would make him date her. And that they had some DNA stored away from when Sasuke was 17 years old (some blood).
However Karin drops the tube containing Sasuke's blood and damages the Y chromosome in the blood. So Orochimaru has to take 2 of Sasuke's X chromosomes to clone him.
Orochimaru could do this by taking a X chromosome from 2 white blood cells in Sasuke's blood.
Suigetsu seems half sure that its Karin's DNA but I think the reason Kishimoto had Suigetsu do the DNA test was because if Orochimaru did the test he would make sure he knew who's DNA he was matching with Sarada's DNA.
If that was Karin's DNA in the desk it confirms that she is the mother. Below are the three options I see being confirmed by Sasuke or Orochimaru:
1. Sarada is a female clone made from 2 of Sasuke's X chromosomes
2. Sarada's mother is Karin
3. Sasuke created Sarada from his rinnegan powers
Kishi could have Orochimaru explain that Karin asked him to clone since she thought that having a clone of Sasuke would make him date her. And that they had some DNA stored away from when Sasuke was 17 years old (some blood).
However Karin drops the tube containing Sasuke's blood and damages the Y chromosome in the blood. So Orochimaru has to take 2 of Sasuke's X chromosomes to clone him.
Orochimaru could do this by taking a X chromosome from 2 white blood cells in Sasuke's blood.