14-49634844-G-T

Variant names:

• chr14-49634844-G-T
• rs1555328112
• NM_018139.3:c.306C>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_018139.3(DNAAF2):​c.306C>A​(p.Ser102Arg) 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. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 35)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: DNAAF2 NM_018139.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.57

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11165124).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNAAF2	NM_018139.3	c.306C>A	p.Ser102Arg	missense_variant	Exon 1 of 3	ENST00000298292.13	NP_060609.2
DNAAF2	NM_001083908.2	c.306C>A	p.Ser102Arg	missense_variant	Exon 1 of 2		NP_001077377.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNAAF2	ENST00000298292.13	c.306C>A	p.Ser102Arg	missense_variant	Exon 1 of 3	1	NM_018139.3	ENSP00000298292.8
DNAAF2	ENST00000406043.3	c.306C>A	p.Ser102Arg	missense_variant	Exon 1 of 2	1		ENSP00000384862.3

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1393200 Hom.: 0 Cov.: 98 AF XY: 0.00 AC XY: 0 AN XY: 686954

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 35

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

May 10, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces serine with arginine at codon 102 of the DNAAF2 protein (p.Ser102Arg). The serine residue is moderately conserved and there is a moderate physicochemical difference between serine and arginine. While this variant is not present in population databases, the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This variant has not been reported in the literature in individuals with DNAAF2-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The arginine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.38
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0053	T;.
Eigen	Benign	-0.33
Eigen_PC	Benign	-0.22
FATHMM_MKL	Benign	0.029	N
LIST_S2	Benign	0.61	T;T
M_CAP	Benign	0.042	D
MetaRNN	Benign	0.11	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.9	L;L
PrimateAI	Uncertain	0.66	T
PROVEAN	Benign	-2.3	N;N
REVEL	Benign	0.055
Sift	Benign	0.095	T;T
Sift4G	Benign	0.42	T;T
Polyphen		0.034	B;B
Vest4		0.14
MutPred		0.41		Gain of catalytic residue at V98 (P = 6e-04);Gain of catalytic residue at V98 (P = 6e-04);
MVP		0.42
MPC		0.68
ClinPred		0.43	T
GERP RS		5.3
Varity_R		0.25
gMVP		0.49

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: rs1555328112; hg19: chr14-50101562;