UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  FORM 10-K


  (Mark one)

  /X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the fiscal year ended December 31, 2007

      OR


  / / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the transition period from ____________ to ____________



      Commission file number: 333-141008-08

      Deutsche Alt-A Securities Mortgage Loan Trust, Series 2007-OA5
      (exact name of issuing entity as specified in its charter)

      ACE Securities Corp.
      (exact name of the depositor as specified in its charter)

      DB Structured Products, Inc.
      (exact name of the sponsor as specified in its charter)



  Delaware                                06-1442101
  (State or other jurisdiction of         (I.R.S. Employer
  incorporation or organization)          Identification No.)



  6525 Morrison Boulevard
  Suite 318
   Charlotte, NC                                28211
  (Address of principal executive             (Zip Code)
  offices)


 Telephone number, including area code: (704) 365-0569



  Securities registered pursuant to Section 12(b) of the Act:

    NONE.



  Securities registered pursuant to Section 12(g) of the Act:

    NONE.



  Indicate by check mark if the registrant is a well-known seasoned issuer, as
  defined in Rule 405 of the Securities Act.

    Yes ___     No  X



  Indicate by check mark if the registrant is not required to file reports
  pursuant to Section 13 or Section 15(d) of the Act.

    Yes ___     No  X




  Indicate by check mark whether the registrant (1) has filed all reports
  required to be filed by Section 13 or 15(d) of the Securities Exchange Act
  of 1934 during the preceding 12 months (or for such shorter period that the
  registrant was required to file such reports), and (2) has been subject to
  such filing requirements for the past 90 days.

    Yes  X      No ___



  Indicate by check mark if disclosure of delinquent filers pursuant to Item
  405 of Regulation S-K (Section 229.405 of this chapter) is not contained
  herein, and will not be contained, to the best of registrant's knowledge, in
  definitive proxy or information statements incorporated by reference in Part
  III of this Form 10-K or any amendment to this Form 10-K.

    Not applicable.



  Indicate by check mark whether the registrant is a large accelerated filer,
  an accelerated filer, a non-accelerated filer, or a smaller reporting
  company.  See the definitions of "large accelerated filer", "accelerated
  filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

   Large accelerated filer ___
   Accelerated filer ___
   Non-accelerated filer X
   Smaller reporting company ___

  Indicate by check mark whether the registrant is a shell company (as defined
  in Rule 12b-2 of the Act).

    Yes ___     No  X



  State the aggregate market value of the voting and non-voting common equity
  held by non-affiliates computed by reference to the price at which the
  common equity was last sold, or the average bid and asked price of such
  common equity, as of the last business day of the registrant's most recently
  completed second fiscal quarter.

    Not applicable.



  Indicate by check mark whether the registrant has filed all documents and
  reports required to be filed by Section 12, 13 or 15(d) of the Securities
  Exchange Act of 1934 subsequent to the distribution of securities under a
  plan confirmed by a court.

    Not applicable.



  Indicate the number of shares outstanding of each of the registrant's
  classes of common stock, as of December 31, 2007.

    Not applicable.



  DOCUMENTS INCORPORATED BY REFERENCE

  List hereunder the following documents if incorporated by reference and the
  Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document
  is incorporated: (1)Any annual report to security holders; (2) Any proxy or
  information statement; and (3)Any prospectus filed pursuant to Rule 424(b)
  or (c) under the Securities Act of 1933. The listed documents should be
  clearly described for identification purposes (e.g., annual report to
  security holders for fiscal year ended December 24, 1980).

  Not applicable.



                                     PART I

  Item 1.      Business.

               Not applicable.


  Item 1A.     Risk Factors.

               Not applicable.


  Item 1B.     Unresolved Staff Comments.

               None.


  Item 2.      Properties.

               Not applicable.


  Item 3.      Legal Proceedings.

               Not applicable.


  Item 4.      Submission of Matters to a Vote of Security Holders.

               Not applicable.




                                     PART II

  Item 5.      Market for Registrant's Common Equity, Related Stockholder
               Matters and Issuer Purchases of Equity Securities.

               Not applicable.


  Item 6.      Selected Financial Data.

               Not applicable.


  Item 7.      Management's Discussion and Analysis of Financial Condition and
               Results of Operation.

               Not applicable.


  Item 7A.     Quantitative and Qualitative Disclosures About Market Risk.

               Not applicable.


  Item 8.      Financial Statements and Supplementary Data.

               Not applicable.


  Item 9.      Changes in and Disagreements With Accountants on Accounting and
               Financial Disclosure.

               Not applicable.


  Item 9A.     Controls and Procedures.

               Not applicable.


  Item 9A(T).  Controls and Procedures.

               Not applicable.


  Item 9B.     Other Information.

               None.




                                    PART III

  Item 10.     Directors, Executive Officers and Corporate Governance.

               Not applicable.


  Item 11.     Executive Compensation.

               Not applicable.


  Item 12.     Security Ownership of Certain Beneficial Owners and Management
               and Related Stockholder Matters.

               Not applicable.


  Item 13.     Certain Relationships and Related Transactions, and Director
               Independence.

               Not applicable.


  Item 14.     Principal Accounting Fees and Services.

               Not applicable.




  ADDITIONAL DISCLOSURE ITEMS PURSUANT TO GENERAL INSTRUCTION J


Item 1112(b) of Regulation AB, Significant Obligor Financial Information.

No single obligor represents 10% or more of the pool assets held by the issuing
entity.



Item 1114(b)(2) of Regulation AB, Significant Enhancement  Provider Financial
Information.

No entity or group of affiliated entities provides any external credit
enhancement or other support for the certificates within this transaction as
described under Item 1114 (a) of Regulation AB.



Item 1115(b) of Regulation AB, Certain Derivatives Instruments (Financial
Information).

Deutsche Bank AG, New York Branch  provides swap derivative instruments for the
trust as disclosed in the Rule 424(b) Prospectus filing with the Commission on
July 31, 2007, Commission File Number 333-141008-08, CIK Number 0001407106.  No
additional disclosure is necessary because the significance percentage for the
swap agreements is less than 10%, as of December 31, 2007.



Item 1117 of Regulation AB, Legal Proceedings.

The registrant knows of no material pending legal proceedings involving the
parties contemplated by Item 1117 of Regulation AB, other than routine
litigation incidental to the duties of those respective parties.



Item 1119 of Regulation AB, Affiliations and Certain Relationships and Related
Transactions.

The information regarding this Item has been previously filed in a 424(b)(5)
filing with the Commission on July 31, 2007, Commission File Number
333-141008-08, CIK Number 0001407106.



Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria.

The reports on assessment of compliance with the servicing criteria for
asset-backed securities and the related attestation reports on such assessments
of compliance are attached hereto under Item 15.

The following parties have reported one or more instances of material
noncompliance with applicable servicing criteria in their reports on assessments
of compliance:

GMAC Mortgage, LLC

Certain custodial account reconciliations were not reviewed within timelines
outlined in the GMACM's policies and procedures, as required by criteria
1122 (d)(2)(vii)(C).  Certain custodial accounts had reconciling items which
were not resolved within 90 calendar days of original identification, as
required by criteria 1122(d)(2)(vii)(D).

Although each servicing criterion required by Item 1122(d) of Regulation AB is
addressed in one or more of the Assessments of Compliance with Servicing
Criteria and related Attestation Reports included with this report, the
Assessment of Compliance of GMAC Mortgage, LLC (the "Servicer")
and related Attestation Report did not address each of the servicing criteria
that the Servicer was required to address under the terms of the related
Servicing Agreement.  The Servicer has not identified such failure to provide
an Assessment and Attestation for these items as a material failure to fulfill
its obligations under the related servicing agreement in the Servicer's
Compliance  Statement provided under Item 1123 of Regulation AB, because the
Servicer asserts that those items are not applicable to the Servicer.



Item 1123 of Regulation AB, Servicer Compliance Statement.

The servicer compliance statements are attached hereto under Item 15.



                               Part IV

  Item 15. Exhibits, Financial Statement Schedules.

  (a) Exhibits.

  (4) Pooling and Servicing Agreement dated as of July 1, 2007 among Ace
  Securities Corp., as depositor, Wells Fargo Bank, N.A. as master servicer
  and securities administrator, Clayton Fixed Income Services Inc., as credit
  risk manager, and HSBC Bank USA, National Association as trustee
  (incorporated herein by reference from Exhibit 4.1 of the Current Report on
  Form 8-K of the registrant, as filed with the Commission on August 15, 2007,
  Commission File Number 333-141008-08, CIK number 0001407106).

  (10) Incorporated by reference as Exhibit (4)

  (31) Rule 13a-14(d)/15d-14(d) Certification.

  (33) Reports on assessment of compliance with servicing criteria for
  asset-backed securities.


    <TABLE>
    
      <c>

    33.1 Deutsche Bank National Trust Company as Custodian
    33.2 GMAC Bank as Sub-Contractor for GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation
    33.3 GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation as Servicer
    33.4 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    33.5 Wells Fargo Bank, N.A. as Paying Agent
    33.6 Wells Fargo Bank, N.A. as Custodian

    </TABLE>


  (34) Attestation reports on assessment of compliance with servicing criteria
  for asset-backed securities.


    <TABLE>
    
      <c>

    34.1 Deutsche Bank National Trust Company as Custodian
    34.2 GMAC Bank as Sub-Contractor for GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation
    34.3 GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation as Servicer
    34.4 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    34.5 Wells Fargo Bank, N.A. as Paying Agent
    34.6 Wells Fargo Bank, N.A. as Custodian

    </TABLE>


   (35) Servicer compliance statement.


    <TABLE>
    
       <c>

    35.1 GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation as Servicer
    35.2 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator

    </TABLE>


   (b) Exhibits identified in paragraph (a) above.

   (c) Omitted.



                          SIGNATURES


  Pursuant to the requirements of Section 13 or 15(d) of the Securities
  Exchange Act of 1934, the registrant has duly caused this report to be
  signed on its behalf by the undersigned, thereunto duly authorized.


   Deutsche Alt-A Securities Mortgage Loan Trust, Series 2007-OA5
   (Issuing Entity)

   Wells Fargo Bank, N.A.
   (Master Servicer)

   /s/ Kristen Ann Cronin
   Kristen Ann Cronin, Vice President
   (senior officer in charge of the servicing function of the master
   servicer)


    Date:   March 26, 2008



  Exhibit Index

  Exhibit No.


   (4) Pooling and Servicing Agreement dated as of July 1, 2007 among Ace
   Securities Corp., as depositor, Wells Fargo Bank, N.A. as master servicer
   and securities administrator, Clayton Fixed Income Services Inc., as credit
   risk manager, and HSBC Bank USA, National Association as trustee
   (incorporated herein by reference from Exhibit 4.1 of the Current Report on
   Form 8-K of the registrant, as filed with the Commission on August 15, 2007,
    Commission File Number 333-141008-08, CIK number 0001407106).

   (10) Incorporated by reference as Exhibit (4)

   (31) Rule 13a-14(d)/15d-14(d) Certification.

   (33) Reports on assessment of compliance with servicing criteria for
   asset-backed securities.


    <TABLE>

    
      <c>
    33.1 Deutsche Bank National Trust Company as Custodian
    33.2 GMAC Bank as Sub-Contractor for GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation
    33.3 GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation as Servicer
    33.4 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    33.5 Wells Fargo Bank, N.A. as Paying Agent
    33.6 Wells Fargo Bank, N.A. as Custodian

    </TABLE>

   (34) Attestation reports on assessment of compliance with servicing
   criteria for asset-backed securities.


    <TABLE>

    
      <c>
    34.1 Deutsche Bank National Trust Company as Custodian
    34.2 GMAC Bank as Sub-Contractor for GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation
    34.3 GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation as Servicer
    34.4 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    34.5 Wells Fargo Bank, N.A. as Paying Agent
    34.6 Wells Fargo Bank, N.A. as Custodian

    </TABLE>

   (35) Servicer compliance statement.


    <TABLE>

    
       <c>
    35.1 GMAC Mortgage, LLC f/k/a GMAC Mortgage Corporation as Servicer
    35.2 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator

    </TABLE>