chr16-84145533-C-A

Position:

• chr16-84145533-C-A

Variant summary

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

The NM_178452.6(DNAAF1):​c.93C>A​(p.His31Gln) 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. 15/21 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. H31Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: DNAAF1 NM_178452.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.101

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]

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=0.14080524).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNAAF1	NM_178452.6	c.93C>A	p.His31Gln	missense_variant	1/12	ENST00000378553.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNAAF1	ENST00000378553.10	c.93C>A	p.His31Gln	missense_variant	1/12	1	NM_178452.6	P1
DNAAF1	ENST00000567918.5	c.93C>A	p.His31Gln	missense_variant, NMD_transcript_variant	1/7	1
DNAAF1	ENST00000570298.5	n.247C>A		non_coding_transcript_exon_variant	1/11	2
DNAAF1	ENST00000563093.5	c.93C>A	p.His31Gln	missense_variant, NMD_transcript_variant	1/11	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1400988 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 691300

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.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 23, 2019

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with DNAAF1-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces histidine with glutamine at codon 31 of the DNAAF1 protein (p.His31Gln). The histidine residue is moderately conserved and there is a small physicochemical difference between histidine and glutamine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	19
DANN	Benign	0.90
DEOGEN2	Benign	0.0041	T
Eigen	Benign	-0.29
Eigen_PC	Benign	-0.42
FATHMM_MKL	Benign	0.11	N
LIST_S2	Benign	0.63	T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.14	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.9	L
MutationTaster	Benign	0.98	N;N
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-2.1	N
REVEL	Benign	0.11
Sift	Uncertain	0.0020	D
Sift4G	Benign	0.068	T
Polyphen		1.0	D
Vest4		0.12
MutPred		0.069		Loss of methylation at R36 (P = 0.104);
MVP		0.37
MPC		0.16
ClinPred		0.62	D
GERP RS		2.4
Varity_R		0.12
gMVP		0.19

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs780631154; hg19: chr16-84179138;