Identification of a Different-type Homeobox Gene, BarH1, Possibly Causing Bar (B) and Om(1D) Mutations in Drosophila

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1991 May 15

PMID 1674606

Citations 33

Authors

T Kojima

S Ishimaru

S Higashijima

E Takayama

H Akimaru

M Sone

Y Emori

K Saigo

Affiliations

Soon will be listed here.

Abstract

The Bar mutation B of Drosophila melanogaster and optic morphology mutation Om(1D) of Drosophila ananassae result in suppression of ommatidium differentiation at the anterior portion of the eye. Examinations was made to determine the genes responsible for these mutations. Both loci were found to share in common a different type of homeobox gene, which we call "BarH1." Polyptides encoded by D. melanogaster and D. ananassae BarH1 genes consist of 543 and 604 amino acids, respectively, with homeodomains identical in sequence except for one amino acid substitution. A unique feature of these homeodomains is that the phenylalanine residue in helix 3, conserved in all metazoan homeodomains so far examined, is replaced by a tyrosine residue. By Northern blotting, considerably more BarH1 RNA was detected in the Bar mutant than in wild type. P element-mediated transformation showed Bar-like eye malformation to be induced by transient overexpression of the BarH1 gene in the late third-instar larvae. Somatic recombination analysis indicated normal gene functions of the Bar region, including the BarH1 gene, to be required for normal eye morphogenesis.

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