Introduction to genetics_for_beginners

Introduction to genetics_for_beginners

1. Introduction to Genetics An Introduction to basic genetic concepts and links to health for individuals who have had minimal experience of genetics OPTOM FASLU MUHAMMED

2. DNA, genes & chromosomes The objectives of this presentation are to: Understand the role and structure of DNA, genes and chromosomes. Understand that proteins are encoded by genes Be aware that alterations in genetic material can cause disease

3. The structure of DNA, genes & chromosomes

4. Chromosomes Chromosomes are made of DNA. Each contains genes in a linear order. Human body cells contain 46 chromosomes in 23 pairs – one of each pair inherited from each parent Chromosome pairs 1 – 22 are called autosomes. The 23rd pair are called sex chromosomes: XX is female, XY is male. Gene for sickle cell disease (chromosome 11) Gene for cystic fibrosis (chromosome 7)

5. Chromosomes p Centromere q Chromosome 5

6. The Karyotype A normal male chromosome pattern would be described as : 4 6,XY . 46 = total number of chromosomes XY = sex chromosome constitution ( XY = male, XX = female). Any further description would refer to any abnormalities or v ariants found

7. Total Genes On Chromosome : 723 373 genes in region marked red, 20 are shown FZD2 AKAP10 ITGB4 KRTHA8 WD1 SOST MPP3 MLLT6 STAT3 BRCA1 breast cancer 1, early onset GFAP NRXN4 NSF NGFR CACNB1 HOXB9 HTLVR ABCA5 CDC6 ITGB3 Chromosome 17 source: Human Genome Project Genes are arranged in linear order on chromosomes

8. The DNA Double Helix

9. What is a mutation? Mutation – an alteration or change in the genetic material In clinical use usually = “harmful” Inherited From exposure to mutagenic agents but more arise spontaneously through errors in DNA replication / repair More likely to be recognised if effects are detrimental

10. Summary Human body cells contain 46 chromosomes in 23 pairs – one of each pair is inherited from each parent Chromosomes are made of DNA Each chromosome contains genes in a linear order Genes are codes for cells to make proteins Alterations in genes or chromosomes alter the protein produced and can hence cause disease

11. THANK YOU