Scientist draw the 21st mankind to the genetic picture of chromosome

Scientist draw the 21st mankind to the genetic picture of chromosome
One composed of Japan, Europe and American scientist international the intersection of scientist and group draw out 21 to the intersection of chromosome and all the intersection of position and picture of gene. The 21st most familiar to the chromosome is and Tang's' syndrome (congenital foolish disease) Relevant, it still works in the morbidity of senile dementia and some cancers. The scientists have the 22nd to the chromosome to half the numbers of chromosome gene to discover the 21st, the latter drew out the genetic picture last year. This may mean the whole genome number less than ones that anticipated farther. The mankind each cell is 23 to the chromosome, every pair contains a piece of chromosome from parents separately. The gene of the chromosome determines human development grows up, decodes these genetic orders to make the scientist understand and treat disease better, including Tang's' syndrome - -The intelligence that a kind of common genetic obstacle causes is slow. All Tang's' syndrome because hereditary child 21 have three lead to the fact to chromosome nearly. It is an important milestone to draw out the 21st this time to the genetic picture of the chromosome, understanding the information to all genes of chromosome of the 21st, researchers can reject the gene which cause Tang's' syndrome, if it is the question of the gene. While drawing the 21st to the genetic picture of chromosome, the researcher finds it includes 225 effective genes, 127 are known. The research in the past revealed the 22nd pair of chromosome had 545 genes. These two pairs of chromosome are very small, has only represented 2% of the whole human genome, but according to the size of these two pairs of chromosome, the human body may only include about 40, 000 genes, 70, 000 to 140, 000 anticipated than before is much less. Scientist find 21 have, grow to the intersection of chromosome and one wondrous characteristic an area there is not a gene. They estimate that there is a similar one on other chromosome " The gene is rare " The area, any meanings are not so obvious in these areas. According to report, until 14 known mutation and one type, the intersection of Lou Gehrig and disease and some other pathological changes of senile dementia of gene have something to do with in the chromosome 21, in addition, can see the change of the special area of chromosome in some tumours. After drawing out the 21st genetic picture to the chromosome, the present challenge is the function of expounding all genes, this will have a far-reaching meaning on understanding the 21st.

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