chr7-780097-T-C

Position:

• chr7-780097-T-C

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_017802.4(DNAAF5):​c.2384T>C​(p.Leu795Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. L795L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: DNAAF5 NM_017802.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 5.52

Genes affected

DNAAF5 (HGNC:26013): (dynein axonemal assembly factor 5) The protein encoded by this gene is essential for the preassembly or stability of axonemal dynein arms, and is found only in organisms with motile cilia and flagella. Mutations in this gene are associated with primary ciliary dyskinesia-18, a disorder characterized by abnormalities of motile cilia. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Feb 2013]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.957
• PP5: Variant 7-780097-T-C is Pathogenic according to our data. Variant chr7-780097-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 39684.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNAAF5	NM_017802.4	c.2384T>C	p.Leu795Pro	missense_variant	12/13	ENST00000297440.11
DNAAF5	XM_024446813.2	c.2239+4935T>C		intron_variant
DNAAF5	NR_075098.2	n.2344T>C		non_coding_transcript_exon_variant	12/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNAAF5	ENST00000297440.11	c.2384T>C	p.Leu795Pro	missense_variant	12/13	1	NM_017802.4	P1
DNAAF5	ENST00000403952.3	c.659T>C	p.Leu220Pro	missense_variant	5/6	1
DNAAF5	ENST00000440747.5	c.1790T>C	p.Leu597Pro	missense_variant	12/13	2
DNAAF5	ENST00000461576.1	n.194T>C		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Primary ciliary dyskinesia 18 Pathogenic:1 Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Oct 05, 2012	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Primary ciliary dyskinesia Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 26, 2022

For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects DNAAF5 function (PMID: 23040496). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt DNAAF5 protein function. ClinVar contains an entry for this variant (Variation ID: 39684). This missense change has been observed in individual(s) with primary ciliary dyskinesia (PCD) (PMID: 23040496). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 795 of the DNAAF5 protein (p.Leu795Pro). -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Feb 07, 2022

Airway epithelial cells from an affected individual showed reduced DNAAF5 levels, absent dynein arms, and loss of ciliary beating (Horani et al., 2012); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 23040496, 23477994, 31534215, 31028937) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.44	T;T
Eigen	Uncertain	0.37
Eigen_PC	Benign	0.21
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.86	D;T
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.96	D;D
MetaSVM	Uncertain	-0.090	T
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.67	T
PROVEAN	Pathogenic	-6.2	D;D
REVEL	Uncertain	0.60
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0020	D;D
Polyphen		1.0	D;D
Vest4		0.98
MutPred		0.72		Gain of loop (P = 0.0045);.;
MVP		0.38
MPC		0.88
ClinPred		0.99	D
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.83
gMVP		0.85

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: rs397514561; hg19: chr7-819734;