Genes and human history Gil McVean, Department of Statistics, Oxford Contact:
[email protected] 2 3 • Where does the variation come from? • How old are the genetic differences between us? • Are these differences important? How different are our genomes? 5 Serological techniques for detecting variation Rabbit Anti-A antibodies Human A A B AB O 6 Blood group systems in humans • 28 known systems – 39 genes, 643 alleles System Genes Alleles Knops CR1 24+ ABO ABO 102 Landsteiner- ICAM4 3 Wiener Colton C4A, C4B 7+ Lewis FUT3, FUT6 14/20 Chido-rodgers AQP1 7 Lutheran LU 16 Colton DAF 10 MNS GYPA,GYPB,G 43 Diego SLC4A1 78 YPE Dombrock DO 9 OK BSG 2 Duffy FY 9 P-related A4GALT, 14/5 Gerbich GYPC 9 B3GALT3 GIL AQP3 2 RAPH-MER2 CD151 3 H/h FUT1, FUT2 27/22 Rh RHCE, RHD, 129 I GCNT2 7 RHAG Indian CD44 2 Scianna ERMAP 4 Kell KEL, XK 33/30 Xg XG, CD99 - Kidd SLC14A1 8 YT ACHE 4 http://www.bioc.aecom.yu.edu/bgmut/summary.htm 7 Protein electroporesis • Changes in mass/charge ratio resulting from amino acid substitutions in proteins can be detected Starch or agar gel -- +- + +- - - - -- - + - + +- -- Direction of travel • In humans, about 30% of all loci show polymorphism with a 6% chance of a pair of randomly drawn alleles at a locus being different Lewontin and Hubby (1966) Harris(1966) 8 The rise of DNA sequencing GATAAGACGGTGATACTCACGCGACGGGCTTGGGCGCCGACTCGTTCAGACGGTGACCCAACTTATCCGATCGACCC CGGGTCCCGATTTAGACTCGGTATCATTTCTGGTGATTATCGCCTGCAGGTTCAAGAACACGTTTGCAGCAAGAAGT GAGGGATTTTGTCAGTGATCCCAGTCTACGGAGCCAGTCACCTCTGGTAGTGAAATTTTATTCGTTCATCTTCATAT AAGTCGCAGACCGCACGATGGGGGACAGAATACTCGCACAGGAAGAACCGCGATGAACCGAGGTAACCTAACATCCT