19-55159201-G-A

Variant names:

• chr19-55159201-G-A
• rs757426979
• NM_001256715.2:c.1487C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001256715.2(DNAAF3):​c.1487C>T​(p.Pro496Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P496H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: DNAAF3 NM_001256715.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.608
• Publications: 2 publications found

Genes affected

DNAAF3 (HGNC:30492): (dynein axonemal assembly factor 3) The protein encoded by this gene is required for the assembly of axonemal inner and outer dynein arms and plays a role in assembling dynein complexes for transport into cilia. Defects in this gene are a cause of primary ciliary dyskinesia type 2 (CILD2). Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2012]

ENSG00000267110 (HGNC:):

DNAAF3-AS1 (HGNC:55292): (DNAAF3 antisense RNA 1)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07975945).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001256715.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DNAAF3	NM_001256715.2	MANE Select	c.1487C>T	p.Pro496Leu	missense	Exon 12 of 12	NP_001243644.1
	DNAAF3	NM_001256714.1		c.1688C>T	p.Pro563Leu	missense	Exon 12 of 12	NP_001243643.1
	DNAAF3	NM_178837.4		c.1628C>T	p.Pro543Leu	missense	Exon 12 of 12	NP_849159.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DNAAF3	ENST00000524407.7	TSL:1 MANE Select	c.1487C>T	p.Pro496Leu	missense	Exon 12 of 12	ENSP00000432046.3
	DNAAF3	ENST00000455045.5	TSL:1	c.1325C>T	p.Pro442Leu	missense	Exon 12 of 12	ENSP00000394343.1
	DNAAF3	ENST00000528412.5	TSL:1	n.*1275C>T		non_coding_transcript_exon	Exon 12 of 12	ENSP00000433826.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Aug 11, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a DNAAF3-related disease. This sequence change replaces proline with leucine at codon 563 of the DNAAF3 protein (p.Pro563Leu). The proline residue is moderately conserved and there is a moderate physicochemical difference between proline and leucine.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0048	T
Eigen	Benign	-0.87
Eigen_PC	Benign	-0.95
FATHMM_MKL	Benign	0.040	N
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.0069	T
MetaRNN	Benign	0.080	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.90	L
PhyloP100		0.61
PrimateAI	Benign	0.30	T
PROVEAN	Uncertain	-2.5	D
REVEL	Benign	0.026
Sift	Uncertain	0.017	D
Sift4G	Uncertain	0.0080	D
Polyphen		0.0010	B
Vest4		0.088
MutPred		0.21		Gain of helix (P = 0.0496)
MVP		0.16
MPC		0.62
ClinPred		0.44	T
GERP RS		0.33
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.1
Varity_R		0.035
gMVP		0.41
Mutation Taster		=97/3	polymorphism

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

Other links and lift over

dbSNP: rs757426979; hg19: chr19-55670569;