scratch, a pan-neural gene encoding a zinc finger protein related to snail, promotes neuronal development.

Abstract:

:The Drosophila scratch (scrt) gene is expressed in most or all neuronal precursor cells and encodes a predicted zinc finger transcription factor closely related to the product of the mesoderm determination gene snail (sna). Adult flies homozygous for scrt null alleles have a reduced number of photoreceptors in the eye, and embryos lacking the function of both scrt and the pan-neural gene deadpan (dpn), which encodes a basic helix-loop-helix (bHLH) protein, exhibit a significant loss of neurons. Conversely, ectopic expression of a scrt transgene during embryonic and adult development leads to the production of supernumerary neurons. Consistent with scrt functioning as a transcription factor, various genes are more broadly expressed than normal in scrt null mutants. Reciprocally, these same genes are expressed at reduced levels in response to ectopic scrt expression. We propose that scrt promotes neuronal cell fates by suppressing expression of genes promoting non-neuronal cell fates. We discuss the similarities between the roles of the ancestrally related scrt, sna, and escargot (esc) genes in regulating cell fate choices.

journal_name

Genes Dev

journal_title

Genes & development

authors

Roark M,Sturtevant MA,Emery J,Vaessin H,Grell E,Bier E

doi

10.1101/gad.9.19.2384

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

2384-98

issue

19

eissn

0890-9369

issn

1549-5477

journal_volume

9

pub_type

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