Well, Chris Large responded to the message that I sent to Maitreya, which humbles me because I am just a lowly amateur brewing scientist. There is new information. To my chagrin, it appears that Y-7407 is a indeed a lager strain, at least genetically. Secondly, the culture is a tetraploid (4 sets of chromosomes), not a diploid as originally claimed in Dunn and Sherlock's publication. However, the most interesting part is that they are in touch with the Lallemand scientist who knows the history of BRY-96 and BRY-97 (Lallemand purchased the Siebel Institute several years ago). It appears that their first sequence of BRY-97 may have been of a contaminant. However, they are currently sequencing a new culture from the original deposit of BRY-97 and it appears to align with Wyeast 1056. From what I am led to believe, BRY-97 is an isolate from a brewery that acquired BRY-96 from Siebel that is superior to the original. I do not know about you, but this information unbelievably cool to me. We are looking at brewing history through the lense of genetics.
I guess that the lesson to be learned here is that cultures will adapt to their environment. I have seen that play out in my sourdough culture. It was all over the place when I first started to make sourdough. Now, it is developing into a more reliable culture. In my humble opinion, every brewer should maintain a sourdough culture and bake sourdough bread. It will give him/her a greater understanding of how the pure brewing cultures we enjoy today evolved.
By the way, here is a photo my gloved hand holding a Siebel culture from a few years ago. If one Googles the address on the slant (6100 Royalmount, Montreal, Canada), one will discover that it is the Lallemand campus in Canada.