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BMC Cell Biol. 2017 Mar 23;18(1):16. doi: 10.1186/s12860-017-0132-1.

Testis-specific ATP synthase peripheral stalk subunits required for tissue-specific mitochondrial morphogenesis in Drosophila.

Author information

1
Department of Biology, Davidson College, Davidson, NC, USA.
2
Departments of Developmental Biology and Genetics, Stanford University School of Medicine, Stanford, CA, USA.
3
Department of Biology, Davidson College, Davidson, NC, USA. kahales@davidson.edu.
4
Departments of Developmental Biology and Genetics, Stanford University School of Medicine, Stanford, CA, USA. kahales@davidson.edu.

Abstract

BACKGROUND:

In Drosophila early post-meiotic spermatids, mitochondria undergo dramatic shaping into the Nebenkern, a spherical body with complex internal structure that contains two interwrapped giant mitochondrial derivatives. The purpose of this study was to elucidate genetic and molecular mechanisms underlying the shaping of this structure.

RESULTS:

The knotted onions (knon) gene encodes an unconventionally large testis-specific paralog of ATP synthase subunit d and is required for internal structure of the Nebenkern as well as its subsequent disassembly and elongation. Knon localizes to spermatid mitochondria and, when exogenously expressed in flight muscle, alters the ratio of ATP synthase complex dimers to monomers. By RNAi knockdown we uncovered mitochondrial shaping roles for other testis-expressed ATP synthase subunits.

CONCLUSIONS:

We demonstrate the first known instance of a tissue-specific ATP synthase subunit affecting tissue-specific mitochondrial morphogenesis. Since ATP synthase dimerization is known to affect the degree of inner mitochondrial membrane curvature in other systems, the effect of Knon and other testis-specific paralogs of ATP synthase subunits may be to mediate differential membrane curvature within the Nebenkern.

KEYWORDS:

ATP synthase; Cristae; Drosophila melanogaster; Mitochondria; Spermatogenesis

PMID:
28335714
PMCID:
PMC5364652
DOI:
10.1186/s12860-017-0132-1
[Indexed for MEDLINE]
Free PMC Article

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