Cortical tethering of mitochondria by the anchor protein Mcp5 enables uniparental inheritance

Chacko, Leeba Ann and Mehta, Kritika and Ananthanarayanan, Vaishnavi (2019) Cortical tethering of mitochondria by the anchor protein Mcp5 enables uniparental inheritance. In: JOURNAL OF CELL BIOLOGY, 218 (11). pp. 3560-3571.

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Abstract

During sexual reproduction in eukaryotes, processes such as active degradation and dilution of paternal mitochondria ensure maternal mitochondrial inheritance. In the isogamous organism fission yeast, we employed high-resolution fluorescence microscopy to visualize mitochondrial inheritance during meiosis by differentially labeling mitochondria of the two parental cells. Remarkably, mitochondria, and thereby mitochondrial DNA from the parental cells, did not mix upon zygote formation but remained segregated at the poles by attaching to clusters of the anchor protein Mcp5 via its coiled-coil domain. We observed that this tethering of parental mitochondria to the poles results in uniparental inheritance of mitochondria, wherein two of the four spores formed subsequently contained mitochondria from one parent and the other spores contained mitochondria from the other parent. Further, the presence of dynein on an Mcp5 cluster precluded the attachment of mitochondria to the same cluster. Taken together, we reveal a distinct mechanism that achieves uniparental inheritance by segregation of parental mitochondria.

Item Type:	Journal Article
Publication:	JOURNAL OF CELL BIOLOGY
Publisher:	ROCKEFELLER UNIV PRESS
Additional Information:	Copyright of this article belongs to ROCKEFELLER UNIV PRESS
Keywords:	NUCLEAR-MOVEMENT; MOTOR-PROTEIN; SACCHAROMYCES-CEREVISIAE; FISSION; DYNEIN; RECOMBINATION; GENES; MICROTUBULES; TRANSMISSION; MOTILITY
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering
Date Deposited:	09 Dec 2019 10:28
Last Modified:	09 Dec 2019 10:28
URI:	http://eprints.iisc.ac.in/id/eprint/63939

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