De novo mutation rate estimation in wolves of known pedigree.

Abstract:

:Knowledge of mutation rates is crucial for calibrating population genetics models of demographic history in units of years. However, mutation rates remain challenging to estimate because of the need to identify extremely rare events. We estimated the nuclear mutation rate in wolves by identifying de novo mutations in a pedigree of seven wolves. Putative de novo mutations were discovered by whole-genome sequencing and were verified by Sanger sequencing of parents and offspring. Using stringent filters and an estimate of the false negative rate in the remaining observable genome, we obtain an estimate of ∼4.5 x 10-9 per base pair per generation and provide conservative bounds from 2.6 x 10-9 and 7.1 x 10-9. Although our estimate is consistent with recent mutation rate estimates from ancient DNA (4.0 x 10-9 and 3.0-4.5 x 10-9), it implies a wider possible range. We also examined the consequences of our rate and the accompanying interval for dating several critical events in canid demographic history. For example, applying our full range of rates to coalescent models of dog and wolf demographic history implies a wide set of possible divergence times between the ancestral populations of dogs and extant Eurasian wolves (16,000 - 64,000 years ago) although our point estimate indicates a date between 25,000 and 33,000 years ago. Aside from one study in mice, ours provides the only direct mammalian mutation rate outside of primates, and is likely to be vital to future investigations of mutation rate evolution.

journal_name

Mol Biol Evol

authors

Koch E,Schweizer RM,Schweizer TM,Stahler DR,Smith DW,Wayne RK,Novembre J

doi

10.1093/molbev/msz159

subject

Has Abstract

pub_date

2019-07-12 00:00:00

eissn

0737-4038

issn

1537-1719

pii

5531468

pub_type

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