Milk protein genetic variation in Butana cattle€¦ · 10.03.2015, A. Said Ahmed 1 Ammar Said...
Transcript of Milk protein genetic variation in Butana cattle€¦ · 10.03.2015, A. Said Ahmed 1 Ammar Said...
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10.03.2015, A. Said Ahmed
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Ammar Said Ahmed
Züchtungsbiologie und molekulare Genetik, Humboldt‐Universität zu Berlin, Invalidenstraβe 42, 10115 Berlin, Deutschland
Milk protein genetic variation in Butana cattle
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Outline
Background Milk composition MP genes structural organization Potential significance of MP variants Sudanese Butana cattle
Methodology Animals and samples DNA sequencing Genotyping Data analysis
Results
Conclusion
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Methodology Results Conclusion
Composition of milk protein
Mainly divided into two fractions:
Soluble whey protein (α-LA) and (β-LG)
coded by: LALBA and LGB genes.
Insoluble casein (αs1, β, αs2, and ĸ-caseins)
coded by: CSN1S1, CSN2, CSN1S2 and CSN3 genes.
Whey 20%
Casein 80%
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Solids 13%
Water 87%
protein 27%
Lactose 37%
Fat 30%
Ash 6%
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Casein genes cluster
The four casein genes mapped to chromosome 6 in a tightly linked 250-kb cluster.
chromosome 6
CSN1S1 CSN2 CSN1S2 CSN3
αs1 ß αs2 ƙ
LALBA and LGB, were mapped on chromosome 5 and 11.
Milk protein genes structural organization
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Methodology Results Conclusion
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Why milk protein variants are of interest?
MP variants = SNPs at encoding genes Amino acid exchange or deletion
Influences on milk performance traits Breed characterization, biodiversity and phylogeny studies Evolutionary histories of cattle breeds Influences on human nutrition
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Methodology Results Conclusion
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Introduced into Africa from South Asia (around 670 AD)
The second best zebu dairy breeds in the world (DAGRIS, 2007)
Well adapted to the harsh environment
Deep red coat color
Longevity
Disease resistance
Milk yield (2.264 ± 131 liters in 283 ±11 days)
Butana breed characteristics
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Methodology Results Conclusion
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10.03.2015, A. Said Ahmed
Methodology Results Conclusion
This work aims at:
Assessing allelic variation of the main milk protein
genes that are characteristic of Butana dairy cattle
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Samples Blood samples from 50 unrelated individuals from Butana area in the north of Sudan.
Area of the study
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Background Results Conclusion
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Sequencing
Sequencing of the six bovine MP genes was carried out using genomic DNA of five
Butana cattle.
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Background Results Conclusion
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Genotyping of SNPs at milk protein loci
Allele specific primers
Genotyping = KASP assays
Statistical analysis
Estimation of allele and haplotype frequencies
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Background Results Conclusion
Gene Exon SNP position
CSN1S1 17 6:87157262 A>G
CSN1S2 3 6:87266177 C>T
CSN3 4 6:87390573 C>T
6:87390576 T>C
6:87390612 C>A
LALBA 1 5:31347973 G>A
2 5:31348386 G>A
LGB 3 11:103303475 G>A
4 11:103304757 T>C
Sequence analysis
Editing and alignment = DNA Baser v3 and Clustalw2
Comparative analysis = reference sequence (UMD3.1 genome database)
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Sequence variants in exon and exon flanking regions of bovine CSN1S1, CSN2, CSN1S2, CSN3, LALBA and LGB genes
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Background Methodology Conclusion
68
7
9
4
14
46
2 1
8
Intronic
synonymous
Non-synonymous
5‘ UTR
3‘ UTR
Total number of SNPs (n = 98) 3.3 SNPs per 100 bp
Novel SNPs (n = 57)
Distribution of identified SNPs and novel SNPs in Butana cattle
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Sequence variants in exons of analyzed MP genes in Butana cattle
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Background Methodology Conclusion
Milk Protein
gene
Protein
variant
Location within
gene
1BTA
chromosomal
position
Amino acid
exchange 2AF
CSN1S1 B Reference - - 0.34
C Exon 17 6:87157262A>G Glu207Gly 0.66
CSN1S2 A Reference - - 0.61
B Exon 3 6:87266177C>T Ser23Phe 0.39
CSN3
A Reference - - 0.59
H
Exon 4
6:87390573C>T Thr156Ile 0.25
B 6:87390576T>C Thr157Ile
0.16 6:87390612C>A Asp169Ala
LALBA
B Reference - - 0.46
A Exon 1 5:31347973G>A Arg29Gln 0.19
E Exon 2 5:31348386A>G Ile60Val 0.35
LGB
B Reference - - 0.88
A Exon 3 11:103303475G>A Gly80Asp
0.12 Exon 4 11:103304757T>C Val134Ala
1Bos taurus autosome (BTA) position relative to reference sequence (UMD3.1)
2AF: allele frequencies are given for 50 genotyped Butana cattle.
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Haplotypes in Butana cattle comprising five DNA polymorphisms in the genes CSN1S1, CSN1S2, and CSN3 of the casein gene cluster
Casein protein variant
HT CSN1S1 CSN1S2 CSN3 Haplotype
frequency
1 B A A 0.25
2 B A B 0.05
3 B A H 0.08
4 B B A 0.03
5 C A A 0.29
6 C A B 0.04
7 C A H 0.04
8 C B A 0.21
9 C B H 0.01
10 C B B 0.01
HT, Haplotype number
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Background Methodology Conclusion
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Conclusion
The current study identified a high number of polymorphisms in the bovine milk
protein genes in Butana cattle.
Nine SNPs were detected in the coding regions of the examined genes with an
influence on the amino acid sequence of the encoded milk proteins.
The numerous non-coding SNPs do not influence the amino acid sequence of
milk protein genes; some of them may be located in functionally important
sequence regions.
The high variability of the milk protein genes in Butana dairy cattle provides a
resource for the development, utilization, and conservation of the local breed.
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Background Methodology Results
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Thank you for your attention!
• Cattle owners in Sudan
• Atbra Animal breeding research station
• Dr. Ahmed Musa Hussain
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Breeding Biology and Molecular
Genetics
Humboldt University in Berlin
Prof. Dr. Gudrun Brockmann
Dr. Monika Reissmann
Angelika Ackermann
Dorothea Schemmel
Saria Almarzook Ralf Bortfeldt
Diana Karweina Ramona Möller
Susanne Kreuzer Danny Arends
Stefan Kärst Jan Tros
Seabstian Heise Uwe Müller