Speciation Observed in Mosquitos

From: Rich Blinne (richblinne@hotmail.com)
Date: Fri Oct 04 2002 - 19:47:27 EDT

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    Published online October 3, 2002

    Submitted on August 27, 2002
    Accepted on September 25, 2002

    A Polytene Chromosome Analysis of the Anopheles gambiae Species Complex

    Mario Coluzzi 1*, Adriana Sabatini 1, Alessandra della Torre 1, Maria Angela
    Di Deco 1, Vincenzo Petrarca 2

    1 Dipartimento di Scienze di Sanitę Pubblica and Istituto Pasteur-Cenci
    Bolognetti, Universitę "La Sapienza," Rome, Italy.
    2 Dipartimento di Genetica e Biologia Molecolare, Universitę "La Sapienza,"
    Rome, Italy.

    * To whom correspondence should be addressed. E-mail:

    Field collected specimens of all known taxa in the Anopheles gambiae complex
    were analyzed on the basis of chromosome inversions with reference to a
    standard polytene chromosome map. The phylogenetic relationship among the
    seven described species in the complex could be inferred from the
    distribution of fixed inversions. Nonrandom patterns of inversion
    distribution were observed and, particularly on chromosome arm 2R, provided
    evidence for genetically distinct populations in A. gambiae, A. arabiensis,
    and A. melas. In A. gambiae from Mali, stable genetic differentiation was
    observed even in populations living in the same region, suggesting a process
    of incipient speciation. The possible role of chromosome differentiation in
    speciation of the A. gambiae complex and in the emergence of distinct
    chromosomal forms within the nominal species is discussed in relation to
    human malaria.

    Science 10.1126/science.1077769
    Copyright © 2002 by The American Association for the Advancement of Science.
    All rights reserved.

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