Haplogroup E-P177
In human population genetics, haplogroups define the major lineages of direct paternal (male) lines back to a shared common ancestor in Africa. Haplogroup E-P177, has 2 known branches, E-P2, which is the most common, and E-P75. Distribution. The Americas. E-P177 was not present in the Americas before European colonization. Subclade distribution. E-P177*. So far there are no attested exemplars of E-M177*. E-P2. The E-P177 lineage is dominated in modern populations by subclade E-P2 (aka E-PN2), which is by far the most frequent. E-P75. Another subclade, E -P75, was announced in and confirmed as a sibling to E-P177 in . Associated SNPs. E-P177 is defined by the P177 SNP alone. Phylogenetics. Phylogenetic history. Prior to 2002, there were in academic literature at least seven naming systems for the Y-Chromosome Phylogenetic tree. This led to considerable confusion. In 2002, the major research groups came together and formed the Y-Chromosome Consortium (YCC). They published a joint paper that created a single new tree that all agreed to use. Later, a group of citizen scientists with an interest in population genetics and genetic genealogy formed a working  group to create an amateur tree aiming at being above all timely. The table below brings together all of these works at the point of the landmark 2002 YCC Tree. This allows a researcher reviewing older published literature to quickly move between nomenclatures. Research publications. The following research teams per their publications were represented in the creation of the YCC tree. Phylogenetic trees. There are several confirmed and proposed phylogenetic trees available for haplogroup E-P177. The scientifically accepted one is the Y-Chromosome Consortium (YCC) one published in and subsequently updated. A draft tree that shows emerging science is  provided by Thomas Krahn at the Genomic Research Center in Houston, Texas. The International Society of Genetic Genealogy (ISOGG) also provides an amateur tree. The Genomic Research Center draft tree. This is Thomas Krahn at the Genomic Research Center's Draft tree Proposed Tree for haplogroup E-P177. The first three levels of subclades are shown. Additional detail is provided on the linked branch article pages . The Y-Chromosome Consortium tree. This is the official scientific tree produced by the Y-Chromosome Consortium (YCC). The last major update was in 2008 . Subsequent updates have been quarterly and biannual. The current  version is a revision of the 2010 update.. The first three levels of subclades are shown. Additional detail is provided on the linked branch article pages. The 2012 ISOGG tree. The subclades of Haplogroup E-P177 with their defining mutation(s), according to the 2012 ISOGG tree are provided below. The first three levels of subclades are shown. Additional detail is provided on the linked branch article pages.