A counter gradient of Activin A and follistatin instructs the timing of hair cell differentiation in the murine cochlea.

Abstract:

:The mammalian auditory sensory epithelium has one of the most stereotyped cellular patterns known in vertebrates. Mechano-sensory hair cells are arranged in precise rows, with one row of inner and three rows of outer hair cells spanning the length of the spiral-shaped sensory epithelium. Aiding such precise cellular patterning, differentiation of the auditory sensory epithelium is precisely timed and follows a steep longitudinal gradient. The molecular signals that promote auditory sensory differentiation and instruct its graded pattern are largely unknown. Here, we identify Activin A and its antagonist follistatin as key regulators of hair cell differentiation and show, using mouse genetic approaches, that a local gradient of Activin A signaling within the auditory sensory epithelium times the longitudinal gradient of hair cell differentiation. Furthermore, we provide evidence that Activin-type signaling regulates a radial gradient of terminal mitosis within the auditory sensory epithelium, which constitutes a novel mechanism for limiting the number of inner hair cells being produced.

journal_name

Elife

journal_title

eLife

authors

Prajapati-DiNubila M,Benito-Gonzalez A,Golden EJ,Zhang S,Doetzlhofer A

doi

10.7554/eLife.47613

subject

Has Abstract

pub_date

2019-06-12 00:00:00

issn

2050-084X

pii

47613

journal_volume

8

pub_type

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