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2014 ; 66
(11
): 671-4
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Parallel evolution of a self-signal: humans and new world monkeys independently
lost the cell surface sugar Neu5Gc
#MMPMID25124893
Springer SA
; Diaz SL
; Gagneux P
Immunogenetics
2014[Nov]; 66
(11
): 671-4
PMID25124893
show ga
Human sialic acid biology is unusual and thought to be unique among mammals.
Humans lack a functional cytidine monophosphate-N-acetylneuraminic acid
hydroxylase (CMAH) protein and cannot synthesize the sugar Neu5Gc, an innate
mammalian signal of self. Losing this sugar changed how humans interact with some
of our deadliest pathogens: malaria, influenza, and streptococcus among others.
We show that the New World monkeys, comprising the third of all primate species,
have human-like sialic acid biology. They have lost Neu5Gc because of an
independent CMAH inactivation ~30 million years ago (mya) (compared to ~3 mya in
hominids). This parallel loss of Neu5Gc opens sialic acid biology to comparative
phylogenetic analysis and reveals an unexpected conservation priority. New World
monkeys risk infection by human pathogens that can recognize cells in the absence
of Neu5Gc. This striking molecular convergence provides a mechanism that could
explain the long-standing observation that New World monkeys are susceptible to
some human diseases that cannot be transmitted to other primates.