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Nucleic Acids Research, 1985, Vol. 13, No. 6 2153-2170
© 1985

Articles

Maternal inheritance of transcripts from three Drosophila src-related genes

Samuel C. Wadsworth*, Kornath Madhavan1 and Diana Bilodeau-Wentworth

Cell Biology Group, Worcester Foundation for Experimental Biology Shrewsbury, MA 01545 1Biology Department, College of the Holy Cross Worcester, MA 01610, USA

*To whom correspondence should be addressed

Received December 7, 1984. Revised February 15, 1985. Accepted February 15, 1985.

The Drosophila genome contains three major sequences related to the v-src gene. Previously published molecular studies have confirmed the structural homology between v-src and two of the Drosophila sequences. We have sequenced a portion of the third v-src Drosophila gene and found that it also shares structural homology with vertebrate and Drosophila src-family genes. RNA sequences from each of the src genes are present in pre-blastoderm embryos indicating that they are of maternal origin. As embryogenesis proceeds, the levels of each of the src RNA sequences decline. The pre-blastoderm src gene transcripts contain poly(A) and are present on polyribosomes suggesting that they are functional mRNAs. Since the Drosophila src transcripts were maternally inherited, we also investigeted their distribution in adult females. The majority of the src transcripts in adult females were contained in ovaries. Only low levels of the transcripts were detected in males. These results strongly suggest that an abundant supply of src protein is required during early embryogenesis, perhaps at the time of cellularization of the blastoderm nuclei.


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