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Non-snRNP U1A levels decrease during mammalian B-cell differentiation and release the IgM secretory poly(A) site from

Jianglin Ma1, Samuel I Gunderson, Catherine Phillips

  • 1Rutgers University, Department of Molecular Biology and Biochemistry, Nelson Laboratories, Room A322, 604 Allison Road, Piscataway, NJ 08854, USA.

RNA (New York, N.Y.)
|December 24, 2005
PubMed
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During B cell differentiation, U1A protein levels decrease, enabling the switch from membrane to secretory Immunoglobulin M (IgM). This reduction in available U1A alleviates its inhibition of the secretory polyadenylation site.

Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Biology

Background:

  • B cell differentiation involves a switch from membrane-bound to secretory Immunoglobulin M (IgM) production.
  • This switch is regulated by the activation of an upstream secretory polyadenylation site.
  • U1A protein is known to inhibit this secretory polyadenylation site.

Purpose of the Study:

  • To investigate how U1A's inhibitory effect is alleviated in differentiated B cells.
  • To determine the role of U1A availability in regulating the secretory polyadenylation site of IgM mRNA.

Main Methods:

  • Utilized B cell lines at various differentiation stages.
  • Assessed U1A protein levels and its association with U1snRNP.
  • Employed cold competitor RNA oligos in nuclear extracts to study polyadenylation.

Related Experiment Videos

  • Immunopurified endogenous U1A to test its effect on poly(A) polymerase activity.

    • Main Results:

    • Differentiated B cells exhibit reduced levels of U1A available to inhibit the secretory polyadenylation site.
    • Undifferentiated B cells possess higher total U1A, with a larger fraction free from U1snRNP.
    • Available U1A levels directly correlate with inhibition of poly(A) addition at the secretory IgM poly(A) site.

    Conclusions:

    • The amount of available U1A, not its intrinsic activity, dictates the regulation of the secretory IgM polyadenylation site.
    • Decreased U1A availability in differentiated B cells is the key mechanism allowing secretory IgM production.