Dear Members, Family and Friends:
We are on the countdown – the month of March is here already, to AAHGS 39th Annual Conference in Philadelphia at the Valley Forge Casino Resort, 1160 1st Avenue, King of Prussia, PA 19406 on the dates of October 11 – 13, 2018.
Are You In – Registered and Excited as We Are to Attend? Here’s the link to registered for the conference – so claim your spot. The host, Family Quest Chapter is well into planning to make sure we have an awesome time. Let’s show our support by attending AAHGS 39thAnnual Conference; after all we’re family and connected in some way!
Share the experience of our conference perhaps with someone who has never attended before and also take pleasure while you’re there in the network opportunities by exchanging information with attendees from various places, near and far.
Don’t delay, register for the conference and book your room reservations.
2018 Conference Committee
This dna visualization was created by Mike Toogood in the UK. Still working on the software for my own genealogy. Enjoy!
Join the dots today!
Visualise your DNA Match Relationships Easily and Quickly
- FREE TO USE – DNADNA is free to use – copyright reserved
- EASY AND SIMPLE – ‘Ever played join the dots … you can use visualisation.
- ARTISTIC – The pictures you produce are pleasing – there is no right or wrong way.
- MEANINGFULNESS – Layout the information in a way that looks meaningful to you.
What is DNADNA?
Join the dots for grown up Genealogists!
best free website builder
- A VISUALISATION SYSTEM Network Analysis pictures can be used to understand complex systems.
- NET GRAPHS ARE IDEAL Understand links between distant DNA cousins.
- A DATA PRE PROCESSOR DNADNA uses logic and simple rules to prune and select the most genealogically relevant bits from the vast amount of data that is now available as more people DNA test.
- MATERNAL/PATERNAL/BOTH INFERENCE ENGINE DNADNA can infer likely relationships from known ones and color your graph accordingly.
By NICHOLAS ST. FLEUR JAN. 25, 2018
Access: The New York Times and The Times of Israel Jan. 25, 2018
This article changes a lot of our current genetic beliefs. It is my opinion, that the new data may verify my thoughts of what happened to the very first known haplogroup L0(A haplogroup is a genetic population group of people who share a common ancestor on the patriline or the matriline. Haplogroups are assigned letters of the alphabet, and refinements consist of additional number and letter combinations.) Dec 28, 2017
I have often written extensively about the Adams and Eves that existed long ago. Often getting negative reactions, silent and challenges to my beliefs. Interest in scientific, anthropological findings clearly researched and shared with other professionals worldwide. Again, I ask that you the reader keep an open mind. Just as anything else in this world, things change as we continue to dig and discover using the best anthropological and genetic tools available. It will be years before we can say for sure, that this is the missing L0 group who are the original men and women of Africa. For sure they are apart of the L0-L6 haplogroup of men and women of Africa. These groups migrated out of Africa over a long period of time, developing mutations such as skin, eye and hair color.
*All DNA testing companies have always used a Eurasian model with there algorithms. It is like a plague to use Africans in their models, which is a bias towards one group as opposed to an another. There are models that take into account African populations with significant results. ( dnatestedafrican.org) strongly suggest a full sequence maternal test if you can afford it or the next lowest which is 67 markers. Testing below YDNA 111 markers paternal is not worth your money but if you can at least test at 67 markers that is great. I do not challenge religious biblical ideology. That is an area that I have no expertise.
Feature Story: The Genome Ball
Forget Those X-Shaped Chromosomes
A Genome Looks Like This
Visitors to the Genome exhibition are frequently intrigued by the Genome Ball, a three-dimensional model of the human genome that represents a creative synthesis of scientific knowledge and technical innovation. For students and adults raised on clinically produced karyotypes – those artificially arranged pairs of X-shaped chromosomes photographed during cell division – the Genome Ball will challenge all their previous (mis)conceptions and show the human genome in a new light.
How did we first begin to grasp the structure of the nucleus? It all began in 1682 when Anton van Leeuwenhoek, a fabric merchant in the Dutch city of Delft, examined blood cells of fish. Leeuwenhoek used a microscope with lenses he’d ground himself, and reported his observations in a letter to the Royal Society:
I came to observe the blood of a cod and of a salmon, which I also found to consist of hardly anything but oval figures … it seemed to me that some of them enclosed in a small space a little round body or globule …
If you’ve looked at human blood under a microscope, that description may sound odd: Mature red blood cells (RBCs) don’t contain nuclei – do they? You’re right! However, the RBCs of fish (and amphibians and reptiles) do indeed have nuclei, and Leeuwenhoek was the first to describe them. Nevertheless, the Royal Society wasn’t blown away by his letter (after all, how much could a business man with “little fortune and no formal education” know about science?). The “little round body or globule” remained nameless for the next 150 years.
Then, in 1831, the Scottish botanist Robert Brown was studying plant fertilization when he noticed that pollen moved in and out of “ovals” in the plant cells. He called each oval a “nucleus,” a Latin word meaning “nut” or “kernel” – a bit like a black walnut surrounded by its thick green hull. Not only did Brown’s name stick, but his 1833 paper even suggested that the nucleus was probably involved in fertilization and the development of embryos.
The next step in our nuclear narrative was taken by Friedrich Miescher, a Swiss physician who extracted and isolated a previously unknown substance from pus-soaked bandages at the hospital where he worked. White blood cells, a major constituent of pus, have very large nuclei, and Miescher correctly concluded that the substance came from those nuclei. He called it “nuclein.” Today we call it DNA.
How many chromosomes in a human cell?
Although the fine points of cell division were still unexplained, scientists in the early 1900s were eager to learn the number of chromosomes in human cells. However, counting the number of human chromosomes during cell division turned out to be quite a challenge. Even when chromosomes were lined up on the “midline” of a cell, scientists’ counts ranged from 16 to 36.
Evidently, Hans von Winiwarter got tired of these wide-ranging approximations. Using the best microscopes available to him in 1912, he produced early karyotypes by capturing and fixing human cells at the moment of cell division. Despite his best efforts, Winiwarter’s counts ranged from 46 to 49; and while noting correctly that women have two X chromosomes, he mistakenly concluded that males had only one X and no Y. For the next 40+ years, students were generally taught that human cells contained 48 chromosomes.
Finally, in 1956, the correct value of “46” was confirmed – 22 pairs of autosomes and 1 pair of sex chromosomes in human cells other than eggs or sperm. It’s surprising to learn that Watson & Crick had published their model of DNA’s structure, opening the world of modern genetics, several years before the number of human chromosomes was firmly established!
Good things come in small packages
By the end of the 20th century, knowledge of DNA structure and the mechanisms of cell division had advanced dramatically. Yet, based on their school textbooks, most people still tended to picture chromosomes as the condensed “X-shaped” bodies seen in karyotypes. DNA was known to uncoil between cell divisions, but it was hard to imagine how such long straggling threads (more than 2 meters, or 6 feet, per cell) could pack into a nucleus only 6/1,000,000 of a meter in diameter (smaller than the diameter of a human hair).
Eventually, studies showed that DNA decreases in length when regions of about 166 base pairs wrap like twine around small proteins to form complexes known as nucleosomes . A short stretch of non-wound DNA falls between each nucleosomal unit, the result looking a bit like a string of beads. In such a configuration, a 1-meter (3-foot) strand of DNA is reduced to 14 cm (about 6 inches). This shortened strand then coils even more, until an X-shaped chromosome in a dividing cell measures roughly 1/10,000 the length of the DNA strand it contains!
The “fractal globule” (aka ramen noodles)
So what does the 3-dimensional model of the nucleus, as seen in the Genome Ball, have to do with all this?
One of the most important discoveries in genome biology has been the demonstration that genomes are non-randomly organized in the nucleus.
Even though chromatin looks like long straggly threads, it is amazingly well organized: Thanks to the organized coiling of chromatin, genes are able to interact with the DNA regions that regulate them.
The genome is organized into “distinct regions of open and closed chromatin regulatory domains,” explains Dr. Laura Elnitski, senior investigator at the National Human Genome Research Institute (NHGRI) of the National Institutes of Health. Put more simply, chromatin that is less active in a given cell type, or chromosomes containing few genes, are located just inside the nuclear membrane; but more active chromatin (for example, a gene coding for insulin in healthy pancreatic cells), and chromosomes carrying many genes, occupy the center of the nucleus. Overall, the nuclear location of specific genes correlates with their activity in a given cell.
Erez Aiden (who spearheaded the Genome Ball project) also discussed chromatin organization in his prize-winning essay in Science: “Loci on the same chromosome – even at opposite ends – interact more than loci on different chromosomes.” And within individual chromosomes, “open [active] chromatin interacts more with open chromatin and closed with closed,” wrote Aiden. In short: Genes have more interactions with regions on their own chromosome; and within any given chromosome, active regions group together with other active regions, while quiet or gene-poor areas group with other quiet regions.
Aiden had found a paper theorizing that long polymers – DNA is a good example – are able to form very tight coils with no knots, “a configuration known as the fractal globule.” One of the most striking characteristics of the fractal globule is that it can be folded and refolded without disturbing the rest of the condensed polymer.
The fractal globule is easy to explain to graduate students because it closely resembles the only food we can afford: ramen, said Aiden.
Uncooked, the noodles don’t contain any knots. Even when partially cooked, they don’t get tangled in the cooking pan. However, ramen noodles do become tangled after cooking, whereas chromatin stably maintains its unknotted state throughout interphase – the period between cell divisions when chromatin in the nucleus uncoils. In that condensed but non-knotted configuration, sections of chromatin that are far apart on the long strands may be brought into proximity. Thus, interactions between chromatin on the same chromosome, or between sections with similar properties or functions, are made possible by the way chromatin is organized in the interphase nucleus.
These are but a few of the innovative and complex understandings that inspired the creators of the Genome Ball (for more information about the 3-D printing of the Genome Ball displayed at the exhibition, see the feature article “Super 3D Model: How the Genome Ball Was Created” on this website). Our knowledge of the nucleus has come a long way in the 332 years since Leeuwenhoek. But, as Aiden’s Science essay concluded: “at the fringes of our maps the world is full of surprises.”
The same is certainly true of the nucleus.
Source: Unlockinglifescode.org/the-genome-ball. Access November 19, 2017, Genome Project NIH
(2) “DNA packaging: Nucleosomes and Chromatin.” Nature Education 1 (2008):26.
(3) “Regulatory and Epigenetic Landscapes of Mammalian Genomes,” Current Topics in Genome Analysis 2014. March 26, 2014.
(4) “Leeuwenhoek Sees the Cell Nucleus.” Science of Aging: Timeline of Discoveries.
(5) Comprehensive Mapping of Long-Range Interactions Reveals Folding Principles of the Human Genome. Science 326 (9 October 2009): 189-324.
I read This article four times to get a feeling for the author and the story. I realized I had transcended home to Igbo land.
Resource: Access August 9, 2017 – https://www.dnatestedafricans.org/single-post/2017/06/18/The-Invisible-Artifact-Something-Amazing-Happened
The Invisible Artifact ~ A Journey From Igboland to South Carolina
April 16, 2017