rs145680314

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_178452.6(DNAAF1):c.1354C>A(p.Pro452Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00131 in 1,612,856 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00081 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0014 ( 1 hom. )

Consequence

DNAAF1
NM_178452.6 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:2

Conservation

PhyloP100: -0.0150

Variant links:

Genes affected

DNAAF1 (HGNC:30539): (dynein axonemal assembly factor 1) The protein encoded by this gene is cilium-specific and is required for the stability of the ciliary architecture. It is involved in the regulation of microtubule-based cilia and actin-based brush border microvilli. Mutations in this gene are associated with primary ciliary dyskinesia-13. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

DNAAF1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.013773799).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00081 (123/151836) while in subpopulation NFE AF= 0.00147 (100/67924). AF 95% confidence interval is 0.00124. There are 0 homozygotes in gnomad4. There are 53 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNAAF1	NM_178452.6 link	c.1354C>A	p.Pro452Thr	missense_variant	Exon 8 of 12	ENST00000378553.10	NP_848547.4	Q8NEP3-1A0A140VJN4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
DNAAF1	ENST00000378553.10 link	c.1354C>A	p.Pro452Thr	missense_variant	Exon 8 of 12	1	NM_178452.6	ENSP00000367815.5	Q8NEP3-1
DNAAF1	ENST00000563818.5 link	n.1031C>A		non_coding_transcript_exon_variant	Exon 4 of 8	2
DNAAF1	ENST00000570298.5 link	n.1508C>A		non_coding_transcript_exon_variant	Exon 8 of 11	2
DNAAF1	ENST00000563093.5 link	n.1226-60C>A		intron_variant	Intron 8 of 10	2		ENSP00000457373.1	Q8NEP3-3

Frequencies

GnomAD3 genomes

AF:

0.000811

AC:

123

AN:

151722

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000340

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

Gnomad ASJ

AF:

0.000576

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000471

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00147

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.000761

AC:

191

AN:

250984

Hom.:

AF XY:

0.000854

AC XY:

116

AN XY:

135758

show subpopulations

Gnomad AFR exome

AF:

0.000495

Gnomad AMR exome

AF:

0.000202

Gnomad ASJ exome

AF:

0.00159

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.000185

Gnomad NFE exome

AF:

0.00131

Gnomad OTH exome

AF:

0.000653

GnomAD4 exome

AF:

0.00137

AC:

1995

AN:

1461020

Hom.:

Cov.:

AF XY:

0.00135

AC XY:

978

AN XY:

726860

show subpopulations

Gnomad4 AFR exome

AF:

0.000209

Gnomad4 AMR exome

AF:

0.000158

Gnomad4 ASJ exome

AF:

0.00134

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000313

Gnomad4 FIN exome

AF:

0.000506

Gnomad4 NFE exome

AF:

0.00164

Gnomad4 OTH exome

AF:

0.00119

GnomAD4 genome

AF:

0.000810

AC:

123

AN:

151836

Hom.:

Cov.:

AF XY:

0.000714

AC XY:

AN XY:

74246

show subpopulations

Gnomad4 AFR

AF:

0.000339

Gnomad4 AMR

AF:

0.0000656

Gnomad4 ASJ

AF:

0.000576

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000471

Gnomad4 NFE

AF:

0.00147

Gnomad4 OTH

AF:

0.000474

Alfa

AF:

0.00135

Hom.:

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00221

AC:

ExAC

AF:

0.000807

AC:

EpiCase

AF:

0.00164

EpiControl

AF:

0.00124

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Primary ciliary dyskinesia

Uncertain:3

Aug 21, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 452 of the DNAAF1 protein (p.Pro452Thr). This variant is present in population databases (rs145680314, gnomAD 0.2%), including at least one homozygous and/or hemizygous individual. This variant has not been reported in the literature in individuals affected with DNAAF1-related conditions. ClinVar contains an entry for this variant (Variation ID: 216831). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Jan 08, 2019

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.P452T variant (also known as c.1354C>A), located in coding exon 8 of the DNAAF1 gene, results from a C to A substitution at nucleotide position 1354. The proline at codon 452 is replaced by threonine, an amino acid with highly similar properties. This amino acid position is well conserved on very limited sequence alignment. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Mar 02, 2021

UNC Molecular Genetics Laboratory, University of North Carolina at Chapel Hill

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Primary ciliary dyskinesia 13

Uncertain:1Benign:1

Sep 16, 2022

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified

Uncertain:1

Jul 26, 2019

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant classified as Uncertain Significance - Favor Benign. The p.Pro452Thr variant in DNAAF1 has not been previously reported in individuals with primary ciliary dyskinesia but has been reported in ClinVar (Variation ID 216831). It has also been identified in 0.13% (171/128786) of European chromosomes and in 0.15% (16/10346) of Ashkenazi Jewish chromosomes by gnomAD (http://gnomad.broadinstitute.org). Computational prediction tools and conservation analysis suggest that this variant may not impact the protein, though this information is not predictive enough to rule out pathogenicity. In summary, while the clinical significance of this variant is uncertain, these data suggest that it is more likely to be benign. ACMG/AMP Criteria applied: BP4. -

not provided

Uncertain:1

Jul 14, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

DNAAF1-related disorder

Benign:1

Jan 31, 2022

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.069

BayesDel_addAF

Benign

-0.52

BayesDel_noAF

Benign

-0.56

CADD

Benign

2.8

DANN

Benign

0.15

DEOGEN2

Benign

0.0072

Eigen

Benign

-0.82

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.011

LIST_S2

Benign

0.54

M_CAP

Benign

0.0015

MetaRNN

Benign

0.014

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.4

PrimateAI

Benign

0.24

PROVEAN

Benign

-0.39

REVEL

Benign

0.030

Sift

Pathogenic

0.0

Sift4G

Benign

0.77

Polyphen

0.84

Vest4

0.22

MVP

0.24

MPC

0.074

ClinPred

0.020

GERP RS

0.54

Varity_R

0.090

gMVP

0.14

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over