Patients with BAM have reduced serum FGF19 which may be useful in diagnosis. We propose a mechanism whereby impaired FGF19 feedback inhibition causes excessive bile acid synthesis that exceeds the normal capacity for ileal reabsorption, producing bile acid diarrhea.
Most cases of IBAM are unlikely to be caused by genetic variation in FABP6 or by major differences in transporter transcript expression. Our evidence indicates that other factors, such as regulation of expression of the basolateral bile acid transporter, should be considered as possible causes.
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