def METHOD_NAME(genesFile):
	print >> sys.stderr, "Reading file " + genesFile
	genes2new = {} 
	genes2old = {} 
	id2nameNew = {} 
	id2nameOld = {} 
	for line in open(genesFile) :
		fields = line.rstrip().split("\t")
		if debug: print fields
		geneId, nameOld = fields[0], fields[1]
		nameNew = ''
		if len(fields) > 2: nameNew = fields[2]
		if nameNew:
			genes2new[nameOld] = nameNew
			id2nameNew[id] = nameNew
		if nameOld:
			genes2old[nameNew] = nameOld
			id2nameOld[id] = nameOld
	return genes2new, genes2old, id2nameNew, id2nameOld