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cientists have published the first complete, gapless sequence of a human genome, two decades after the Human Genome Project produced the first draft human genome sequence. Ac- cording to researchers, having a complete, gap-free sequence of the roughly three billion bases (or letters) in our DNA is crit- ical for understanding the full spectrum of human genomic variation and for understand- ing the genetic contributions to certain diseases. The work
Breakthrough:
First Complete, Gapless Human Genome Sequence
knowledge of chromosomes, including more accurate maps for five chromosome arms, which opens new lines of research. This helps answer basic biology questions about how chromosomes properly segregate and divide. The T2T consortium used the now- complete genome sequence as a reference to discover more than two million additional variants in the human genome. These studies provide more accurate information about the genomic variants within 622 medically relevant genes. human disease. The now-complete human genome sequence will be particularly valuable for studies that aim to establish comprehensive views of human genomic variation, or how people's DNA differs. Such insights are vital for understanding the genetic contributions to certain diseases and for using genome sequence as a routine part of clinical care in the future. Many research groups have already started using a pre-release version of the complete human genome sequence for their research. The full sequencing builds upon the work of the Human Genome Project, which mapped about 92 percent of the genome, and research undertaken since then. Thousands of researchers have developed better laboratory tools, computational methods and strategic approaches to decipher the complex sequence. Six papers encompassing the completed sequence appear in Science , along with companion papers in several other journals. That last eight percent includes numerous genes and repetitive DNA and is comparable in size to an entire chromosome. Researchers generated the complete genome sequence using a special cell line that has two identical copies of each chromosome, unlike most human cells, which carry two slightly different
PHOTO CREDIT: ADOBE STOCK
Generating a truly complete human genome sequence represents an incredible scientific achievement, providing the first comprehensive view of our DNA blueprint."
-Eric Green, M.D., Ph.D.
was done by the Telomere to Telomere (T2T) consortium, which included leadership from researchers at the National Hu- man Genome Research Institute (NHGRI), part of the National In- stitutes of Health; the University of California, Santa Cruz; and the University of Washington, Seattle. NHGRI was the primary funder of the study. Analyses of the complete genome sequence will significantly add to our Generating a truly complete human genome sequence represents an incredible scientific achievement, providing the irst comprehensive view of our DNA blueprint, said Eric Green, M.D., Ph.D., director of NHGRI. This foundational information will strengthen the many ongoing efforts to understand all the functional nuances of the human genome, which in turn will empower genetic studies of copies. The researchers noted that most of the newly added DNA sequences were near the repetitive telomeres (long, trailing ends of each chromosome) and centromeres (dense middle sections of each chromosome).
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