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: 333-130373-19

      MASTR Alternative Loan Trust 2007-1
      (exact name of issuing entity as specified in its charter)

      Mortgage Asset Securitization Transactions, Inc.
      (exact name of the depositor as specified in its charter)

      UBS Real Estate Securities Inc.
      (exact name of the sponsor as specified in its charter)



  Delaware                                06-1204982
  (State or other jurisdiction of         (I.R.S. Employer
  incorporation or organization)          Identification No.)



  1285 Avenue of the Americas
   New York, NY                                10019
  (Address of principal executive             (Zip Code)
  offices)


 Telephone number, including area code: (212) 713-2000



  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).

Bear Stearns Financial Products Inc., provides a cap agreement derivative
instrument for the trust as disclosed in the 424 Prospectus.  No additional
disclosure is necessary because the significance percentage for the cap
agreement is less than 10%.



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.

Certain information regarding this Item has been previously filed in a 424(b)(5)
filing dated January 31, 2007, Commission File Number 333-130373-19, CIK Number
0001384063.

In addition, on March 16, 2008, JPMorgan Chase & Co. (JPMorgan Chase) announced
that it had entered into an Agreement and Plan of Merger, dated March 16, 2008
(the Agreement and Plan of Merger), and subsequently amended by Amendment No. 1
to the Agreement and Plan of Merger, dated as of March 24, 2008 (such amendment,
together with the Agreement and Plan of Merger, the Merger Agreement), with The
Bear Stearns Companies Inc., the parent company of Bear Stearns Financial
Product, Inc. The Merger Agreement provides that, upon the terms and subject to
the conditions set forth in Merger Agreement, a wholly-owned subsidiary of
JPMorgan Chase will merge with and into The Bear Stearns Companies Inc. with The
Bear Stearns Companies Inc. continuing as the surviving corporation and as a
wholly-owned subsidiary of JPMorgan Chase. The Merger Agreement has been
approved by the Boards of Directors of The Bear Stearns Companies Inc. and
JPMorgan Chase and is subject to customary closing conditions, including
stockholder approval. The Federal Reserve, the Office of the Comptroller of the
Currency and other federal agencies have given all necessary approvals for the
merger. The merger is expected to be completed by the end of the second calendar
year quarter of 2008; however, there can be no assurance that the merger will
close as contemplated.

In connection with the Merger Agreement, JPMorgan Chase issued an Amended and
Restated Guaranty Agreement, effective as of March 16, 2008 (the Guaranty),
guaranteeing the obligations and liabilities of The Bear Stearns Companies Inc.
and certain of its affiliates, including Bear Stearns Financial Product, Inc.s
obligations under the cap agreement. A copy of the Guaranty is filed as Exhibit
99.1 to this Form 10-K. Except with respect to the addition of this Guaranty,
the terms and conditions of the cap agreement remain unchanged.

JPMorgan Chase is a financial holding company incorporated under Delaware law,
whose principal office is located in New York, New York. JPMorgan Chase services
include investment banking, financial services for consumers, small business and
commercial banking, financial transaction processing, asset management, and
private equity. A component of the Dow Jones Industrial Average, JPMorgan Chase
serves millions of consumers in the United States and many of the world's
corporate, institutional and government clients under its JPMorgan and Chase
brands. Information about JPMorgan Chase is available at www.jpmorganchase.com.



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
Assessment of Compliance and related Attestation Report of Wachovia Mortgage
Corporation (the "Servicer"), 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.

  (4.1) The Pooling and Servicing Agreement dated as of January 1, 2007 among
  Mortgage Asset Securitization Transactions, Inc., as depositor, UBS Real
  Estate Securities Inc., as transferor, Wells Fargo Bank, N.A., as master
  servicer, trust administrator and custodian, U.S. Bank 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
  February 13, 2007, Commission File Number 333-130373-19, CIK Number
  0001384063).

  (4.2) The Trust Agreement dated as of January 1, 2007 among Mortgage Asset
  Securitization Transactions, Inc., as depositor, U.S. Bank National
  Association, as trustee, and Wells Fargo Bank, N.A., as trust administrator
  (incorporated herein by reference from Exhibit 99.1 of the Current Report on
  Form 8-K of the registrant, as filed with the Commission on February 13,
  2007, Commission File Number 333-130373-19, CIK Number 0001384063).

  (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 Countrywide Home Loans Servicing LP as Servicer  *
    33.2 Wachovia Mortgage Corporation as Servicer  *
    33.3 Wells Fargo Bank, N.A. as Servicer  *
    33.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator  *
    33.5 Wells Fargo Bank, N.A. as Paying Agent  *
    33.6 Wells Fargo Bank, N.A. as Custodian  *
    33.7 ZC Sterling Insurance Agency, Inc. as Sub-Contractor for Wachovia Mortgage
    Corporation  *

    </TABLE>


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


    <TABLE>
    
      <c>

    34.1 Countrywide Home Loans Servicing LP as Servicer  *
    34.2 Wachovia Mortgage Corporation as Servicer  *
    34.3 Wells Fargo Bank, N.A. as Servicer  *
    34.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator  *
    34.5 Wells Fargo Bank, N.A. as Paying Agent  *
    34.6 Wells Fargo Bank, N.A. as Custodian  *
    34.7 ZC Sterling Insurance Agency, Inc. as Sub-Contractor for Wachovia Mortgage
    Corporation  *

    </TABLE>


   (35) Servicer compliance statement.


    <TABLE>
    
       <c>

    35.1 Countrywide Home Loans Servicing LP as Servicer  *
    35.2 Wachovia Mortgage Corporation as Servicer  *
    35.3 Wells Fargo Bank, N.A. as Servicer  *
    35.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator  *

    </TABLE>


   (99) Additional Exhibit.

   99.1 Amended and Restated Guaranty Agreement of JPMorgan Chase & Co.
   effective as of March 16, 2008  *

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

   (c) Omitted.

   * Filed herewith



                          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.


   MASTR Alternative Loan Trust 2007-1
   (Issuing Entity)

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

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


    Date:   March 28, 2008



  Exhibit Index

  Exhibit No.


   (4.1) The Pooling and Servicing Agreement dated as of January 1, 2007 among
   Mortgage Asset Securitization Transactions, Inc., as depositor, UBS Real
   Estate Securities Inc., as transferor, Wells Fargo Bank, N.A., as master
   servicer, trust administrator and custodian, U.S. Bank 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 February 13, 2007, Commission File Number 333-130373-19, CIK Number
   0001384063).

   (4.2) The Trust Agreement dated as of January 1, 2007 among Mortgage Asset
   Securitization Transactions, Inc., as depositor, U.S. Bank National
   Association, as trustee, and Wells Fargo Bank, N.A., as trust administrator
   (incorporated herein by reference from Exhibit 99.1 of the Current Report
   on Form 8-K of the registrant, as filed with the Commission on February 13,
   2007, Commission File Number 333-130373-19, CIK Number 0001384063).

   (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 Countrywide Home Loans Servicing LP as Servicer
    33.2 Wachovia Mortgage Corporation as Servicer
    33.3 Wells Fargo Bank, N.A. as Servicer
    33.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator
    33.5 Wells Fargo Bank, N.A. as Paying Agent
    33.6 Wells Fargo Bank, N.A. as Custodian
    33.7 ZC Sterling Insurance Agency, Inc. as Sub-Contractor for Wachovia Mortgage
    Corporation

    </TABLE>

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


    <TABLE>

    
      <c>
    34.1 Countrywide Home Loans Servicing LP as Servicer
    34.2 Wachovia Mortgage Corporation as Servicer
    34.3 Wells Fargo Bank, N.A. as Servicer
    34.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator
    34.5 Wells Fargo Bank, N.A. as Paying Agent
    34.6 Wells Fargo Bank, N.A. as Custodian
    34.7 ZC Sterling Insurance Agency, Inc. as Sub-Contractor for Wachovia Mortgage
    Corporation

    </TABLE>

   (35) Servicer compliance statement.


    <TABLE>

    
       <c>
    35.1 Countrywide Home Loans Servicing LP as Servicer
    35.2 Wachovia Mortgage Corporation as Servicer
    35.3 Wells Fargo Bank, N.A. as Servicer
    35.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator

    </TABLE>

   (99) Additional Exhibit.

   99.1 Amended and Restated Guaranty Agreement of JPMorgan Chase & Co.
   effective as of March 16, 2008