rs752795172

Positions:

• chr14-49634762-C-A
• chr14-49634762-C-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_018139.3(DNAAF2):​c.388G>T​(p.Glu130Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000694 in 1,441,572 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 35)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: DNAAF2 NM_018139.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.675

Genes affected

DNAAF2 (HGNC:20188): (dynein axonemal assembly factor 2) This gene encodes a highly conserved protein involved in the preassembly of dynein arm complexes which power cilia. These complexes are found in some cilia and are assembled in the cytoplasm prior to transport for cilia formation. Mutations in this gene have been associated with primary ciliary dyskinesia. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 14-49634762-C-A is Pathogenic according to our data. Variant chr14-49634762-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 411173.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNAAF2	NM_018139.3	c.388G>T	p.Glu130Ter	stop_gained	1/3	ENST00000298292.13
DNAAF2	NM_001083908.2	c.388G>T	p.Glu130Ter	stop_gained	1/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNAAF2	ENST00000298292.13	c.388G>T	p.Glu130Ter	stop_gained	1/3	1	NM_018139.3	P2
DNAAF2	ENST00000406043.3	c.388G>T	p.Glu130Ter	stop_gained	1/2	1		A2

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome AF: 6.94e-7 AC: 1 AN: 1441572 Hom.: 0 Cov.: 98 AF XY: 0.00000140 AC XY: 1 AN XY: 716628

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.04e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 35

ExAC AF: 0.00000848 AC: 1

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 24, 2016

This sequence change creates a premature translational stop signal at codon 130 (p.Glu130*) of the DNAAF2 gene. It is expected to result in an absent or disrupted protein product. While this particular variant has not been reported in the literature, truncating variants in DNAAF2 are known to be pathogenic (PMID: 19052621). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	36
DANN	Uncertain	1.0
Eigen	Uncertain	0.43
Eigen_PC	Benign	0.22
FATHMM_MKL	Benign	0.38	N
MutationTaster	Benign	1.0	A;A
Vest4		0.056
GERP RS		3.5

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

Other links and lift over

dbSNP: rs752795172; hg19: chr14-50101480;