Branched-chain fatty acids (FAs) are commonly found in many organisms from bacteria to human. In human, over 70 mono- and dimethyl branched acids are found in normal Vernix caseosa , 18-methyleicosanoic acid in disease hair , methylated odd-chain fatty acid (C17) in disease brain , branched or odd-chain FAs in disease blood.
Some branched FAs are known to have specific essential roles.
- 17Ciso for protein biosynthesis 
- 21Canteiso for hydrophobicity of hair fiber
- C15iso for anticancer 
- C15iso and C17iso for C. elegans development 
Iso and anteiso configuration
Monomethyl branched-chain FAs with a single methyl group attached next to the terminal carbon is called as iso configuration. If a single methyl group is attached to second-next to the terminal carbon, it is called anteiso configuration. Both configurations are prevalent in bacteria, especially thermophilic and cold-tolerant species .
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List of branched chain fatty acids
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