AMENDMENT TO INVESTMENT SUB-ADVISORY AGREEMENT BETWEEN JACKSON NATIONAL ASSET MANAGEMENT, LLC AND OPPENHEIMERFUNDS, INC.

                                                                EX-99.23(d)(90)

                                    AMENDMENT
                                       TO
                        INVESTMENT SUB-ADVISORY AGREEMENT
                                     BETWEEN
                     XXXXXXX NATIONAL ASSET MANAGEMENT, LLC
                                       AND
                             OPPENHEIMERFUNDS, INC.

     This AMENDMENT is made by and between  XXXXXXX  NATIONAL ASSET  MANAGEMENT,
LLC, a Michigan  limited  liability  company and registered  investment  adviser
("Adviser"),  and OPPENHEIMERFUNDS,  INC., a Colorado corporation and registered
investment adviser ("Sub-Adviser").

     WHEREAS,   the  Adviser  and   Sub-Adviser   entered  into  an   Investment
Sub-Advisory Agreement dated as of April 25, 2001 ("Agreement"), whereby Adviser
appointed Sub-Adviser to provide certain  sub-investment  advisory services to a
investment portfolio of the JNL Series Trust; and

     WHEREAS,  pursuant  to  the  Agreement,  the  Adviser  agreed  to  pay  the
Sub-Adviser  for  the  services   provided  and  the  expenses  assumed  by  the
Sub-Adviser a sub-advisory fee as set forth on Schedule B to the Agreement,  and
the  Sub-Adviser  agreed to accept such  sub-advisory  fee as full  compensation
under the Agreement for such services and expenses; and

     NOW THEREFORE,  in consideration of the mutual covenants herein  contained,
the parties hereby agree to amend the Agreement as follows:

     1.   Schedule B to the  Agreement  is hereby  deleted  and  replaced in its
          entirety with Schedule B dated July 1, 2005, attached hereto.

     IN WITNESS  WHEREOF,  the  Adviser  and the  Sub-Adviser  have  caused this
Amendment to be executed as of this 1st day of July, 2005.

XXXXXXX NATIONAL ASSET
MANAGEMENT, LLC                     OPPENHEIMERFUNDS, INC.


By:  /s/ Xxxx X. Xxxxx              By:  /s/ Xxxxxxxxx X. Xxxxxx
     ----------------------------       -------------------------------

Name:    XXXX X. XXXXX              Name:  XXXXXXXXX X. XXXXXX
       --------------------               -----------------------------

Title:    CHIEF FINANCIAL OFFICER   Title: VICE PRESIDENT
        --------------------------        -----------------------------




                                   SCHEDULE B
                               DATED JULY 1, 2005

                                 (Compensation)

                       JNL/XXXXXXXXXXX GLOBAL GROWTH FUND


       AVERAGE DAILY NET ASSETS                    ANNUAL RATE

       $0 to $350 Million                              0.35%
       Next $450 Million                               0.30%
       Amounts over $800 Million                       0.25%

                           JNL/XXXXXXXXXXX GROWTH FUND

       AVERAGE DAILY NET ASSETS                    ANNUAL RATE

       $0 to $100 Million                              0.40%
       $100 Million to $250 Million                    0.35%
       Over $250 Million                               0.30%