rs7156297

chr14-49635072-G-Achr14-49635072-G-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_018139.3(DNAAF2):c.78C>T(p.Ala26=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00254 in 1,585,936 control chromosomes in the GnomAD database, including 70 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. A26A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.013 (39 hom., cov: 32)
  • Exomes 𝑓: 0.0015 (31 hom.)
• Consequence: DNAAF2 NM_018139.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: 0.792

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 Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.51).
• BP6: Variant 14-49635072-G-A is Benign according to our data. Variant chr14-49635072-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 221190.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-49635072-G-A is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=0.792 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0127 (1942/152362) while in subpopulation AFR AF= 0.0437 (1819/41588). AF 95% confidence interval is 0.0421. There are 39 homozygotes in gnomad4. There are 939 alleles in male gnomad4 subpopulation. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 39 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNAAF2	NM_018139.3	c.78C>T	p.Ala26=	synonymous_variant	1/3	ENST00000298292.13
DNAAF2	NM_001083908.2	c.78C>T	p.Ala26=	synonymous_variant	1/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNAAF2	ENST00000298292.13	c.78C>T	p.Ala26=	synonymous_variant	1/3	1	NM_018139.3	P2
DNAAF2	ENST00000406043.3	c.78C>T	p.Ala26=	synonymous_variant	1/2	1		A2

Frequencies

GnomAD3 genomes AF: 0.0127 AC: 1939 AN: 152242 Hom.: 39 Cov.: 32

Gnomad AFR AF: 0.0438

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00451

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.00637

Gnomad NFE AF: 0.000412

Gnomad OTH AF: 0.0110

GnomAD3 exomes AF: 0.00284 AC: 560 AN: 197016 Hom.: 7 AF XY: 0.00217 AC XY: 235 AN XY: 108064

Gnomad AFR exome AF: 0.0444

Gnomad AMR exome AF: 0.00212

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000155

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000274

Gnomad OTH exome AF: 0.00118

GnomAD4 exome AF: 0.00146 AC: 2090 AN: 1433574 Hom.: 31 Cov.: 34 AF XY: 0.00128 AC XY: 910 AN XY: 710698

Gnomad4 AFR exome AF: 0.0453

Gnomad4 AMR exome AF: 0.00260

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000219

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000217

Gnomad4 OTH exome AF: 0.00342

GnomAD4 genome AF: 0.0127 AC: 1942 AN: 152362 Hom.: 39 Cov.: 32 AF XY: 0.0126 AC XY: 939 AN XY: 74502

Gnomad4 AFR AF: 0.0437

Gnomad4 AMR AF: 0.00451

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.000412

Gnomad4 OTH AF: 0.0109

Alfa AF: 0.00277 Hom.: 1

Bravo AF: 0.0145

Asia WGS AF: 0.00346 AC: 12 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Primary ciliary dyskinesia 10 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Jan 06, 2022	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Primary ciliary dyskinesia Benign:2

Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Dec 15, 2014	This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 29, 2024	- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Feb 19, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.51
Cadd	Benign	13
Dann	Benign	0.96

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: rs7156297; hg19: chr14-50101790;