Forward-looking statements This document contains forward-looking statements. All statements other than statements of historical facts contained in this document, including statements regarding possible or assumed future

Wave Life Sciences Corporate

Presentation September 10, 2018 Exhibit 99.1

Forward-looking statements This

document contains forward-looking statements. All statements other than statements of historical facts contained in this document, including statements regarding possible or assumed future results of operations, preclinical and clinical studies,

business strategies, research and development plans, collaborations and partnerships, regulatory activities and timing thereof, competitive position, potential growth opportunities, use of proceeds and the effects of competition are forward-looking

statements. These statements involve known and unknown risks, uncertainties and other important factors that may cause the actual results, performance or achievements of Wave Life Sciences Ltd. (the "Company") to be materially different

from any future results, performance or achievements expressed or implied by the forward-looking statements. In some cases, you can identify forward-looking statements by terms such as "may," "will," "should,"

"expect," "plan," "aim," "anticipate," "could," "intend," "target," "project," "contemplate," "believe," "estimate,"

"predict," "potential" or "continue" or the negative of these terms or other similar expressions. The forward-looking statements in this presentation are only predictions. The Company has based these

forward-looking statements largely on its current expectations and projections about future events and financial trends that it believes may affect the Company's business, financial condition and results of operations. These forward-looking

statements speak only as of the date of this presentation and are subject to a number of risks, uncertainties and assumptions, including those listed under Risk Factors in the Company's Form 10-K and other filings with the SEC, some of which

cannot be predicted or quantified and some of which are beyond the Company's control. The events and circumstances reflected in the Company's forward-looking statements may not be achieved or occur, and actual results could differ

materially from those projected in the forward-looking statements. Moreover, the Company operates in a dynamic industry and economy. New risk factors and uncertainties may emerge from time to time, and it is not possible for management to predict

all risk factors and uncertainties that the Company may face. Except as required by applicable law, the Company does not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information,

future events, changed circumstances or otherwise.

We are leading a new era of precision

medicine in which rationally designed nucleic acid therapies are the key to delivering safer, more effective treatments for serious, genetically defined diseases

Architects of transformation Wave Life

Sciences is a clinical-stage, genetic medicines company unlocking the potential of a proprietary chemistry platform that enables the precise design, optimization and production of stereopure nucleic acid therapies. Wave has reinvented the design,

synthesis and manufacture of nucleic acid therapies to potentially optimize potency, durability and safety PRECISION Ability to design nucleic acid compounds that have one defined and consistent profile SCALE Platform potential across multiple

modalities and tissues Internal expertise and capacity for large-scale GMP manufacturing Wave's chemistry platform is built on a foundation of two core capabilities:

WAVE RATIONAL DESIGN Stereochemistry

enables precise control, ability to optimize critical constructs into one defined and consistent profile Building the optimal, stereopure medicine STANDARD OLIGONUCLEOTIDE APPROACHES Pharmacologic properties include >500,000 permutations in every

dose Impact: Unreliable therapeutic effects Unintended off-target effects Impact: Potential for safer, more effective, targeted medicines that can address difficult-to-treat diseases

Source: Iwamoto N, et al. Control of

phosphorothioate stereochemistry substantially increases the efficacy of antisense oligonucleotides. Nature Biotechnology. 2017. Creating a new class of oligonucleotides WAVE RATIONAL DESIGN

Optimizing potency and durability

across multiple tissues CNS Muscle Liver MALAT1 Knockdown in Mice Knockdown of Serum hAPOC3 Protein Levels in Mice Two 5 mg/kg doses on Days 1&3 PBS Stereopure Eye MALAT1 Knockdown in Non-Human Primates Single 450 g IVT injection 10 Weeks

after single 100 g injection DMD: Percent Skipped Transcript in mdx23 Mice Stereorandom Stereopure Single 150 mg/kg IV injection Data represented in this slide from in vivo studies. CNS: PBS = phosphate buffered saline; Ctx = cortex; Str =

striatum; Cb = cerebellum; Hp = hippocampus; SC = spinal cord. Retina Gastroc

Stereochemistry allows for Human TLR9

activation assay with 5mC modified CpG containing MOE gapmer Cytokine induction in human PBMC assay Chemistry affects immune activation Complement Activation Human TLR9 Activation Cytokine Induction Complement activation in non-human primate serum

assay Data represented in this slide from in vitro studies. MOE = 2 -O-methoxyethylribose; PBMC = peripheral blood mononuclear cell; TLR9 = toll-like receptor 9. Stereorandom Stereopure Stereorandom Stereopure

MUSCLE Pipeline spanning multiple

modalities, novel targets CLINICAL NEXT ANTICIPATED MILESTONES CANDIDATE DISCOVERY ESTIMATED U.S. PREVALENCE* TARGET BIOMARKER MECHANISM PARTNER WAVE'S COMMERCIAL RIGHTS CNS A Huntington's disease ~10k / ~35k mHTT SNP1 mHTT Phase 1b/2a

Top line data H1 2019 Takeda 50% Global A Huntington's disease ~10k / ~35k mHTT SNP2 mHTT Phase 1b/2a Top line data H1 2019 Takeda 50% Global A Amyotrophic lateral sclerosis ~1,800 C9orf72 Dipeptide Trial initiation Q4 2018 Takeda 50% Global A

Frontotemporal dementia ~7,000 C9orf72 Dipeptide Trial initiation Q4 2018 Takeda 50% Global S Spinocerebellar ataxia 3 ATXN3 Takeda 50% Global Candidate by YE 2018 ~4,500 CNS diseases Multiple Takeda Milestones & Royalties OPHTHALMOLOGY

HEPATIC S Metabolic liver diseases APOC3 Triglyceride Pfizer Milestones & Royalties Metabolic liver diseases Multiple (4) Pfizer Milestones & Royalties *Estimates of U.S. prevalence and addressable population by target based on

publicly available data and are approximate; for Huntington's disease, numbers approximate manifest and pre-manifest populations, respectively. During a four-year term, Wave and Takeda may collaborate on up to six preclinical targets

at any one time. Pfizer has nominated four undisclosed targets in addition to APOC3. E = exon skipping. A = allele-specific silencing. S = silencing. E Duchenne muscular dystrophy ~2,000 Exon 51 Dystrophin Phase 1 Top line data Q4 2018

- 100% Global E Duchenne muscular dystrophy ~1,250 Exon 53 Dystrophin - 100% Global Neuromuscular diseases Multiple - 100% Global Retinal diseases Multiple - 100% Global

Huntington's Disease

Huntington's Disease: a

hereditary, fatal disorder Autosomal dominant disease, characterized by cognitive decline, psychiatric illness and chorea; fatal No approved disease-modifying therapies Expanded CAG triplet repeat in HTT gene results in production of mutant

huntingtin protein (mHTT); accumulation of mHTT causes progressive loss of neurons in the brain Wildtype (healthy) HTT protein critical for neuronal function; suppression may have detrimental long-term consequences 30,000 people with

Huntington's disease in the US; another 200,000 at risk of developing the condition Sources: Auerbach W, et al. Hum Mol Genet. 2001;10:2515-2523. Dragatsis I, et al. Nat Genet. 2000;26:300-306. Leavitt BR, et al. J Neurochem.

2006;96:1121-1129. Nasir J, et al. Cell. 1995;81:811-823. Reiner A, et al. J Neurosci. 2001;21:7608-7619. White JK, et al. Nat Genet. 1997;17:404-410. Zeitlin S, et al. Nat Genet. 1995;11:155-163. Carroll JB, et al. Mol Ther. 2011;19:2178-2185. DNA

CAG Repeat RNA wildtype (healthy) allele RNA mutant allele Normal CAG Repeat Expanded CAG Repeat Healthy protein (HTT) Mutant protein (mHTT) Neuro HD

Utilize association between single

nucleotide polymorphisms (SNPs) and genetic mutations to specifically target errors in genetic disorders, including HD. Allele-specificity possible by targeting SNPs associated with expanded long CAG repeat in mHTT gene Approach aims to lower mHTT

transcript while leaving healthy HTT relatively intact Potential to provide treatment for up to 70% of HD population (either oligo alone could address approximately 50% of HD population) Wave approach: novel, allele-specific silencing expanded CAG

repeat SNP 1 ~50% of patients SNP 2 ~50% of patients ~20% of patients may carry both SNP1 AND SNP 2 Source: Kay, et al. Personalized gene silencing therapeutics for Huntington disease. Clin Genet 2014: 86: 29-36 Total: Due to overlap, an

estimated ~70% of the total HD patient population carry SNP 1 and/or SNP 2 Neuro HD

placebo-controlled multi-ascending-dose trials for WVE-120101, WVE-120102 Primary objective: assess safety and tolerability of intrathecal doses in early manifest HD patients Additional objectives: exploratory pharmacokinetic, pharmacodynamic,

clinical and MRI endpoints Two simultaneous Phase 1b/2a clinical trials Pre-screening blood test to determine presence of SNP 1 or SNP 2 Approximately 50 patients per trial Key inclusion criteria: age 25 to 65, stage I or II HD Top

line data anticipated H1 2019 Neuro HD

Selective reduction of mHTT mRNA

& protein Reporter Cell Line* Neuro HD

Demonstrated delivery to brain

tissue WVE-120101 and WVE-120102 distribution in cynomolgus non-human primate brain following intrathecal bolus injection Demonstrated delivery to brain tissue CIC = cingulate cortex. CN = caudate nucleus. In Situ Hybridization ViewRNA stained

tissue Red dots are WVE-120102 oligonucleotide. Arrow points to nuclear and perinuclear distribution of WVE-120102 in caudate nucleus Red dots are WVE-120101 oligonucleotide. Arrow points to nuclear and perinuclear distribution of WVE- 120101 in

cingulate cortex CIC = cingulate cortex In Situ Hybridization ViewRNA stained tissue Neuro HD CN = caudate nucleus

Duchenne Muscular Dystrophy (DMD)

DMD: a progressive, fatal childhood

disorder Fatal, X-linked genetic neuromuscular disorder characterized by progressive, irreversible loss of muscle function, including heart and lung Genetic mutation in dystrophin gene prevents the production of dystrophin protein, a critical

component of healthy muscle function Symptom onset in early childhood; one of the most serious genetic diseases in children worldwide Current disease modifying treatments have demonstrated minimal dystrophin expression and clinical benefit has not

been established Impacts 1 in every 5,000 newborn boys each year; 20,000 new cases annually worldwide Neuro DMD

Wave approach: meaningful

restoration of dystrophin production through exon skipping Neuro DMD Meaningful restoration of dystrophin production is expected to result in therapeutic benefit Exon-skipping antisense approaches may enable production of functional dystrophin

protein Initial patient populations are those amenable to Exon 51 and Exon 53 skipping

WVE-210201 Phase 1 clinical trial

initiated November 2017 Design: Multicenter, double-blind, placebo-controlled, single ascending dose study with I.V. administration Primary endpoint: Safety and tolerability Inclusion criteria: ages 5 to 18, amenable to exon 51 skipping Ambulatory

and non-ambulatory boys eligible, including those previously treated with eteplirsen (following appropriate washout period) Readout expected Q4 2018 Open-label extension (OLE) with muscle biopsy and 2-years of follow-up WVE-210201 planned

efficacy study Efficacy readout anticipated H2 2019 Design: Double-blind, placebo-controlled, multi-dose study assessing dystrophin expression and clinical outcomes Measurement of dystrophin via standardized Western Blot Interim analysis of

dystrophin expression in muscle biopsies Exploring intravenous and subcutaneous formulations for WVE-210201 Exon 51: WVE-210201 clinical program Neuro DMD

Exon 51: improved skipping

efficiency RNA skipping determined by quantitative RT-PCR Wave isomers demonstrated a dose-dependent increase in skipping efficiency Free uptake at 10uM concentration of each compound with no transfection agent Same foundational

stereopure chemistry for Wave isomers; individually optimized to assess ideal profile Neuro DMD Dose Response on Skipping Efficiency (mRNA, in vitro) (4 days)

Dystrophin protein restoration in

vitro was quantified to be between 50-100% of normal skeletal muscle tissue lysates, as compared to about 1% by drisapersen and eteplirsen analogs Exon 51: increased dystrophin restoration *Analogs dystrophin (400-427 kDa) vinculin (120 kDa) Marker

Mock Drisapersen* Eteplirsen* WVE-210201 WV-isomer 2 WV-isomer 3 Skeletal Muscle Tissue lysates Marker 0 M Skeletal Muscle Tissue (2 fold less lysate) 0.1 M 0.3 M 1 M 3 M 10 M Skeletal Muscle Tissue dystrophin

(400-427 kDa) vinculin (120 kDa) Experimental conditions: DMD protein restoration by Western Blot in patient-derived myotubes with clear dose effect. Free uptake at 10uM concentration of each compound with no transfection agent WVE-210201

Exon 51: in vivo target engagement

of WVE-210201 in healthy non-human primate 5 doses @ 30 mg/kg /week for 4 weeks healthy NHP by subcutaneous dosing Nested PCR Assay Neuro DMD Experimental conditions: Muscle tissues were collected 2 days after the last dose and fresh frozen.

Total RNAs were extracted with phenol/chloroform and converted to cDNA using high capacity kit. Nested PCR assay was performed and analyzed by fragment analyzer.

Exon 51: no apparent tissue

accumulation observed Standard oligonucleotides tend to accumulate in liver and kidney Wave rationally designed oligonucleotides optimized to allow compound to clear more effectively WVE-210201 demonstrated wide tissue distribution in dose dependent

fashion No apparent accumulation observed after multiple doses Single in vivo I.V. dose at 30 mpk in MDX 23 mice Neuro DMD Experimental description: Oligo quantifications in tissues were performed using hybridization ELISA assay

Wave stereopure surrogate yields

substantial natural dystrophin protein restoration in mdx 23 mice 70-90% of natural dystrophin production in vivo An exon 23 skipping molecule with a similar profile to WVE-210201 Level of transcript production observed in vivo correlates strongly

to what was observed in vitro at the same 10uM doses Protein production after 1 month of treatment (4 weekly doses) *Numbers indicate individual animals Methods: mdx 23 mice received 4 weekly IV doses (150 mg/kg). Tissues collected 96 hours post

final dose. Protein expression determined by western blot. Neuro DMD

Exon 53: targeting oligonucleotide

rapidly distributes to muscle within 24 hours after injection Bright field view 63x oil Nucleus: Hematoxylin; Light Blue Wave oligo: ViewRNA, Fast Red Nucleus: Hoechst33342; Blue Wave oligo: Fast Red/Cy3; Pink Red Fluorescence channel view Z Stack

view Data derived from in vivo preclinical research. Methods: A single dose of stereopure ASO 30 mg/kg IV was administered to mdx 23 mice. Tissues collected 24 hours post dose and ASO was detected in muscles using ViewRNA. Neuro DMD

RNA skipping determined by

quantitative RT-PCR Free uptake at 10uM and 3uM concentration of each compound with no transfection agent Exon 53 Program: improved skipping efficiency Neuro DMD Percentage Exon 53 Skipping of Preliminary Wave Isomers WVE 53 Compound E WVE 53

Compound F WVE 53 Compound E WVE 53 Compound F Wave early Exon 53 data suggests skipping efficiency up to 70%

C9orf72 Amyotrophic Lateral

Sclerosis (ALS) Frontotemporal Dementia (FTD)