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 of the issuing entity: 333-130545-47

      Merrill Lynch Mortgage Backed Securities Trust, Series 2007-1
      (exact name of issuing entity as specified in its charter)

      Merrill Lynch Mortgage Investors, Inc.
      (exact name of the depositor as specified in its charter)

      Merrill Lynch Mortgage Lending, Inc.
      (exact name of the sponsor as specified in its charter)



  New York                                54-2199300
  (State or other jurisdiction of         54-2199301
  incorporation or organization)          54-6740340
                                          (I.R.S. Employer
                                          Identification No.)


   c/o Wells Fargo Bank, N.A.
   9062 Old Annapolis Road
   Columbia, MD                                 21045
  (Address of principal executive               (Zip Code)
  offices)


 Registrant's telephone number, including area code: (410) 884-2000




  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



  Note - Checking the box above will not relieve any registrant required to
  file reports pursuant to Section 13 or 15(d) of the Exchange Act from their
  obligations under those Sections.


  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 (Do not check if a smaller reporting company)
   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 the latest practicable date.

    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.

               Omitted.


  Item 1A.     Risk Factors.

               Omitted.


  Item 1B.     Unresolved Staff Comments.

               None.


  Item 2.      Properties.

               Omitted.


  Item 3.      Legal Proceedings.

               Omitted.


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

               Omitted.




                                     PART II

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

               Omitted.


  Item 6.      Selected Financial Data.

               Omitted.


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

               Omitted.


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

               Omitted.


  Item 8.      Financial Statements and Supplementary Data.

               Omitted.


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

               Omitted.


  Item 9A.     Controls and Procedures.

               Omitted.


  Item 9A(T).  Controls and Procedures.

               Omitted.


  Item 9B.     Other Information.

               None.




                                    PART III

  Item 10.     Directors, Executive Officers and Corporate Governance.

               Omitted.


  Item 11.     Executive Compensation.

               Omitted.


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

               Omitted.


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

               Omitted.


  Item 14.     Principal Accounting Fees and Services.

               Omitted.




  ADDITIONAL DISCLOSURE ITEMS FOR REGULATION AB


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).

No entity or group of affiliated entities provides any derivative instruments
or other support for the certificates within this transaction as described
under Item 1115 of Regulation AB.



Item 1117 of Regulation AB, Legal Proceedings.

The registrant knows of no material pending legal proceedings involving the
Trust and all parties related to such Trust, 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 dated March 30, 2007.



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.

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
Servicer's, IndyMac Bank, F.S.B., Assessment of Compliance 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 Compliance
Statements 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.

  (4.1) Pooling and Servicing Agreement, dated as of March 1, 2007, among
  Merrill Lynch Mortgage Investors, Inc., as depositor, HSBC Bank USA,
  National Association, as trustee, and Wells Fargo Bank, N.A., as master
  servicer and securities administrator. (filed as an exhibit to Form 8-K on
  April 13, 2007)

  (10.1) Mortgage Loan Purchase Agreement, dated as of March 1, 2007, between
  Merrill Lynch Mortgage Lending, Inc., as seller, and Merrill Lynch Mortgage
  Investors, Inc., as purchaser. (filed as an exhibit to Form 8-K on April 13,
  2007)

  (10.2) Assignment, Assumption and Recognition Agreement, dated as of March 1,
   2007, among Merrill Lynch Mortgage Lending, Inc., Merrill Lynch Mortgage
  Investors, Inc. and IndyMac Bank, F.S.B. (filed as an exhibit to Form 8-K on
  April 13, 2007)

  (10.3) Master Seller's Warranties and Servicing Agreement, dated as of May 1,
   2006, between Merrill Lynch Mortgage Lending, Inc. and IndyMac Bank, F.S.B.
  (filed as an exhibit to Form 8-K on April 13, 2007)

  (10.4) Assignment, Assumption and Recognition Agreement, dated as of June 1,
  2007, among Merrill Lynch Mortgage Lending, Inc., as assignor, Merrill Lynch
  Mortgage Investors, Inc., as assignee, and WFB, as company. (filed as an
  exhibit to Form 8-K on June 7, 2007)

  (10.5) Seller's Warranties and Servicing Agreement, dated as of November 1,
  2006, between Merrill Lynch Bank, USA, as purchaser, and Wells Fargo Bank, N.
  A., as company. (filed as an exhibit to Form 8-K on June 7, 2007)

  (31) Sarbanes-Oxley Certification.

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


    <TABLE>
    
      <c>

    33.1 ABN AMRO Mortgage Group, Inc. as Servicer
    33.2 IndyMac Bank, F.S.B. as Servicer
    33.3 Newport Management Corporation as Sub-Contractor for IndyMac Bank,
         F.S.B.
    33.4 Wells Fargo Bank, N.A. as Servicer
    33.5 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    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 ABN AMRO Mortgage Group, Inc. as Servicer
    34.2 IndyMac Bank, F.S.B. as Servicer
    34.3 Newport Management Corporation as Sub-Contractor for IndyMac Bank,
         F.S.B.
    34.4 Wells Fargo Bank, N.A. as Servicer
    34.5 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    34.6 Wells Fargo Bank, N.A. as Custodian

    </TABLE>


   (35) Servicer compliance statement.


    <TABLE>
    
       <c>

    35.1 IndyMac Bank, F.S.B. as Servicer
    35.2 Wells Fargo Bank, N.A. as Servicer
    35.3 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator

    </TABLE>


   (b) Not applicable.

   (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.


   Merrill Lynch Mortgage Backed Securities Trust, Series 2007-1
   (Issuing Entity)

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

   /s/ Diane Courtney
   Diane Courtney, Vice President
   (senior officer in charge of the servicing function of the master
   servicer)


    Date:   March 26, 2008



  Exhibit Index

  Exhibit No.


   (4.1) Pooling and Servicing Agreement, dated as of March 1, 2007, among
   Merrill Lynch Mortgage Investors, Inc., as depositor, HSBC Bank USA,
   National Association, as trustee, and Wells Fargo Bank, N.A., as master
   servicer and securities administrator. (filed as an exhibit to Form 8-K on
   April 13, 2007)

   (10.1) Mortgage Loan Purchase Agreement, dated as of March 1, 2007, between
   Merrill Lynch Mortgage Lending, Inc., as seller, and Merrill Lynch Mortgage
   Investors, Inc., as purchaser. (filed as an exhibit to Form 8-K on April 13,
    2007)

   (10.2) Assignment, Assumption and Recognition Agreement, dated as of March
   1, 2007, among Merrill Lynch Mortgage Lending, Inc., Merrill Lynch Mortgage
   Investors, Inc. and IndyMac Bank, F.S.B. (filed as an exhibit to Form 8-K
   on April 13, 2007)

   (10.3) Master Seller's Warranties and Servicing Agreement, dated as of May
   1, 2006, between Merrill Lynch Mortgage Lending, Inc. and IndyMac Bank, F.S.
   B. (filed as an exhibit to Form 8-K on April 13, 2007)

   (10.4) Assignment, Assumption and Recognition Agreement, dated as of June 1,
    2007, among Merrill Lynch Mortgage Lending, Inc., as assignor, Merrill
   Lynch Mortgage Investors, Inc., as assignee, and WFB, as company. (filed as
   an exhibit to Form 8-K on June 7, 2007)

   (10.5) Seller's Warranties and Servicing Agreement, dated as of November 1,
   2006, between Merrill Lynch Bank, USA, as purchaser, and Wells Fargo Bank,
   N.A., as company. (filed as an exhibit to Form 8-K on June 7, 2007)

   (31) Sarbanes-Oxley Certification.

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


    <TABLE>

    
      <c>
    33.1 ABN AMRO Mortgage Group, Inc. as Servicer
    33.2 IndyMac Bank, F.S.B. as Servicer
    33.3 Newport Management Corporation as Sub-Contractor for IndyMac Bank,
         F.S.B.
    33.4 Wells Fargo Bank, N.A. as Servicer
    33.5 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    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 ABN AMRO Mortgage Group, Inc. as Servicer
    34.2 IndyMac Bank, F.S.B. as Servicer
    34.3 Newport Management Corporation as Sub-Contractor for IndyMac Bank,
         F.S.B.
    34.4 Wells Fargo Bank, N.A. as Servicer
    34.5 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    34.6 Wells Fargo Bank, N.A. as Custodian

    </TABLE>

   (35) Servicer compliance statement.


    <TABLE>

    
       <c>
    35.1 IndyMac Bank, F.S.B. as Servicer
    35.2 Wells Fargo Bank, N.A. as Servicer
    35.3 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator

    </TABLE>