FlyBase:Maps

Genetic, Cytological and Genomic Map Coordinates for D. melanogaster Genes

FlyBase offers a downloadable spreadsheet that lists the genomic coordinates, cytological (polytene band) position and genetic map position for all annotated D. melanogaster genes. Information for each chromosome arm is available on a separate tab of the spreadsheet. For both cytological and genetic map positions, we report both experimentally determined values reported in the literature as well as FlyBase computational estimates. For genetic map positions, we also provide an alternative computational estimate based on the mapping of millions of SNPs from thousands or recombination events Comeron et. al., 2012.

D. melanogaster Chromosome Maps

Site is in progress. Files will be available with the new FB2016_04 release, currently scheduled for May 24, 2016.

Table 1. The original illustrations of D. melanogaster polytene chromosomes by Bridges and Slizynski.

Species	Chromosome	Muller Element	References	File
D. melanogaster	X	A	Bridges 1938, Bridges 1935	Dmel_X_Bridges.png
D. melanogaster	2L	B	Bridges 1942, Bridges 1935	Dmel_2L_Bridges.png
D. melanogaster	2R	C	Bridges and Bridges 1939, Bridges 1935	Dmel_2R_Bridges.png
D. melanogaster	3L	D	Bridges 1941, Bridges 1935	Dmel_3L_Bridges.png
D. melanogaster	3R	E	Bridges 1941, Bridges 1935	Dmel_3R_Bridges.png
D. melanogaster	4	F	Slizynski 1944	Dmel_4_Slizynski.png

Table 2. The original electron micrographs of D. melanogaster polytene chromosomes by Lefevre. High magnification electron micrographs of individual D. melanogaster polytene chromosome bands are available from Saura, Saura and Sorsa, University of Helsinki. These electron micrographs offer an alternative reference for checking polytene band references.

Species	Chromosome	Muller Element	References	File
D. melanogaster	X	A	Lefevre 1976	File:Dmel X Lefevre.png
D. melanogaster	2L	B	Lefevre 1976	File:Dmel 2L Lefevre.png
D. melanogaster	2R	C	Lefevre 1976	File:Dmel 2R Lefevre.png
D. melanogaster	3L	D	Lefevre 1976	File:Dmel 3L Lefevre.png
D. melanogaster	3R	E	Lefevre 1976	File:Dmel 3R Lefevre.png
D. melanogaster	4	F	Lefevre 1976	File:Dmel 4 Lefevre.png

Table 3. Annotated D. melanogaster chromosome maps that combine illustrations and electron micrographs with annotation of the genomic, genetic and cytological positions indicated for select genes. Note that for the Y chromosome, the micrograph shown is of a prometaphase mitotic chromosome. Note also that large genome assembly gaps are not depicted in GBrowse, and so Y chromosome genes look closer together than they really are.

Species	Chromosome	Muller Element	References	File
D. melanogaster	X	A	.	File:Dmel X.png
D. melanogaster	2L	B	.	File:Dmel 2L.png
D. melanogaster	2R	C	.	File:Dmel 2R.png
D. melanogaster	3L	D	.	File:Dmel 3L.png
D. melanogaster	3R	E	.	File:Dmel 3R.png
D. melanogaster	4	F	.	File:Dmel_4.png
D. melanogaster	Y	.	Kennison 1981, Hazelrigg et. al., 1982, Gatti and Pimpinelli 1983	Media:File:Dmel_Y.jpg