NM_178452.6:c.1300_1322delGGAGATGGAGAGCCAGAGGGGAC

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_178452.6(DNAAF1):c.1300_1322delGGAGATGGAGAGCCAGAGGGGAC(p.Gly434ProfsTer4) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000173 in 1,582,856 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. G434G) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00019 ( 0 hom. )

Consequence

DNAAF1
NM_178452.6 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5

Conservation

PhyloP100: 1.03

Publications

1 publications found

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 Gene-Disease associations (from GenCC):

primary ciliary dyskinesia 13
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, PanelApp Australia
primary ciliary dyskinesia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

DNAAF1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 16-84170123-AGGACGGAGATGGAGAGCCAGAGG-A is Pathogenic according to our data. Variant chr16-84170123-AGGACGGAGATGGAGAGCCAGAGG-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 525404.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNAAF1	NM_178452.6 link	c.1300_1322delGGAGATGGAGAGCCAGAGGGGAC	p.Gly434ProfsTer4	frameshift_variant	Exon 8 of 12	ENST00000378553.10	NP_848547.4	Q8NEP3-1A0A140VJN4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNAAF1	ENST00000378553.10 link	c.1300_1322delGGAGATGGAGAGCCAGAGGGGAC	p.Gly434ProfsTer4	frameshift_variant	Exon 8 of 12	1	NM_178452.6	ENSP00000367815.5		Q8NEP3-1

Frequencies

GnomAD3 genomes

AF:

0.0000527

AC:

AN:

151692

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000118

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000239

AC:

AN:

251330

AF XY:

0.0000147

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000528

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000186

AC:

266

AN:

1431164

Hom.:

AF XY:

0.000166

AC XY:

118

AN XY:

711350

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

32758

American (AMR)

AF:

0.00

AC:

AN:

43438

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24796

East Asian (EAS)

AF:

0.00

AC:

AN:

36814

South Asian (SAS)

AF:

0.00

AC:

AN:

83274

European-Finnish (FIN)

AF:

0.0000189

AC:

AN:

52878

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5484

European-Non Finnish (NFE)

AF:

0.000238

AC:

260

AN:

1093172

Other (OTH)

AF:

0.0000854

AC:

AN:

58550

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.365

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000527

AC:

AN:

151692

Hom.:

Cov.:

AF XY:

0.0000675

AC XY:

AN XY:

74094

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41228

American (AMR)

AF:

0.00

AC:

AN:

15246

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5166

South Asian (SAS)

AF:

0.00

AC:

AN:

4792

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10562

Middle Eastern (MID)

AF:

0.00

AC:

AN:

312

European-Non Finnish (NFE)

AF:

0.000118

AC:

AN:

67928

Other (OTH)

AF:

0.00

AC:

AN:

2080

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.419

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000868

Hom.:

Bravo

AF:

0.0000567

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Primary ciliary dyskinesia

Pathogenic:2

Dec 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Gly434Profs*4) in the DNAAF1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in DNAAF1 are known to be pathogenic (PMID: 19944400, 19944405). This variant is present in population databases (rs745495583, gnomAD 0.006%). This premature translational stop signal has been observed in individual(s) with primary ciliary dyskinesia (PMID: 19944405). ClinVar contains an entry for this variant (Variation ID: 525404). For these reasons, this variant has been classified as Pathogenic. -

Aug 24, 2021

Ambry Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1300_1322del23 pathogenic mutation, located in coding exon 8 of the DNAAF1 gene, results from a deletion of 23 nucleotides at nucleotide positions 1300 to 1322, causing a translational frameshift with a predicted alternate stop codon (p.G434Pfs*4). This alteration was detected along with another DNAAF1 translational frameshift mutation in an individual with primary ciliary dyskinesia (PCD) (Duquesnoy P et al. Am J Hum Genet, 2009 Dec;85:890-6). This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Primary ciliary dyskinesia 13

Pathogenic:1

Dec 29, 2023

Fulgent Genetics, Fulgent Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Pathogenic:1

Oct 08, 2024

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 19944400, 19944405, Carretero-Vilarroig2024[casereport], 27996046) -

DNAAF1-related disorder

Pathogenic:1

Jan 12, 2024

PreventionGenetics, part of Exact Sciences

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The DNAAF1 c.1300_1322del23 variant is predicted to result in a frameshift and premature protein termination (p.Gly434Profs*4). This variant has been reported with a second DNAAF1 variant in an individual with primary ciliary dyskinesia (Duquesnoy et al. 2009. PubMed ID: 19944405) and in the heterozygous state in an individual with testicular cancer (Litchfield et al. 2016. PubMed ID: 27996046). At PreventionGenetics, this variant has been detected in the homozygous state in individuals who received testing for ciliopathies (Internal Data). This variant is reported in 0.0062% of alleles in individuals of European (non-Finnish) descent in gnomAD. Frameshift variants in DNAAF1 are expected to be pathogenic. This variant is interpreted as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

1.0

Mutation Taster

=33/167

disease causing (ClinVar)

(source)

Splicing

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

Publications

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NM_178452.6:c.1300_1322delGGAGATGGAGAGCCAGAGGGGAC

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over