Subcellular Genomics: Pervasive within-mitochondrion SNV heteroplasmy revealed by single mitochondrion sequencing

• Published in: Cell reports (Cambridge) Vol. 21; no. 10; pp. 2706 - 2713
• Main Authors: Morris, Jacqueline, Na, Young-Ji, Zhu, Hua, Lee, Jae-Hee, Giang, Hoa, Ulyanova, Alexandra V., Baltuch, Gordon H., Brem, Steven, Chen, H. Isaac, Kung, David K., Lucas, Timothy H., O’Rourke, Donald M., Wolf, John A., Grady, M. Sean, Sul, Jai-Yoon, Kim, Junhyong, Eberwine, James
• Format: Journal Article
• Language: English
• Published: 05-12-2017
• ISSN: 2211-1247
• DOI: 10.1016/j.celrep.2017.11.031

A number of mitochondrial diseases arise from Single Nucleotide Variant (SNV) accumulation in multiple mitochondria. Here we present a method for identification of variants present at the single mitochondrion level in individual mouse and human neuronal cells allowing for extremely high resolution study of mitochondrial mutation dynamics. We identified extensive heteroplasmy between individual mitochondrion, along with three high confidence variants in mouse and one in human that were present in multiple mitochondria across cells. The pattern of variation revealed by single mitochondrion data shows surprisingly pervasive levels of heteroplasmy in inbred mice. Distribution of SNV loci suggests inheritance of variants across generations resulting in Poisson jackpot lines with large SNV load. Comparison of human and mouse variants suggests that the two species might employ distinct modes of somatic segregation. Single mitochondrion resolution revealed mitochondria mutational dynamics that we hypothesize to affect risk probabilities for mutations reaching disease thresholds.
Morris et al. use independent sequencing of multiple individual mitochondria from mouse and human brain cells to show high pervasiveness of mutations. The mutations are heteroplasmic within single mitochondria and within and between cells. These findings suggest mechanisms by which mutations accumulate over time, resulting in mitochondrial dysfunction and disease.