15-55430756-G-A

Position:

• chr15-55430756-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_130810.4(DNAAF4):​c.1177C>T​(p.Leu393Phe) 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DNAAF4 NM_130810.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.38

Genes affected

DNAAF4 (HGNC:21493): (dynein axonemal assembly factor 4) This gene encodes a tetratricopeptide repeat domain-containing protein. The encoded protein interacts with estrogen receptors and the heat shock proteins, Hsp70 and Hsp90. An homologous protein in rat has been shown to function in neuronal migration in the developing neocortex. A chromosomal translocation involving this gene is associated with a susceptibility to developmental dyslexia. Mutations in this gene are associated with deficits in reading and spelling. Alternative splicing results in multiple transcript variants. Read-through transcription also exists between this gene and the downstream cell cycle progression 1 (CCPG1) gene. [provided by RefSeq, Mar 2011]

DNAAF4-CCPG1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.881

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DNAAF4	NM_130810.4	c.1177C>T	p.Leu393Phe	missense_variant	10/10	ENST00000321149.7	NP_570722.2
DNAAF4-CCPG1	NR_037923.1	n.1408+1741C>T		intron_variant, non_coding_transcript_variant
DNAAF4	NM_001033559.3	c.1071C>T	p.His357=	synonymous_variant	9/9		NP_001028731.1
DNAAF4	NM_001033560.2	c.1047+4149C>T		intron_variant			NP_001028732.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DNAAF4	ENST00000321149.7	c.1177C>T	p.Leu393Phe	missense_variant	10/10	1	NM_130810.4	ENSP00000323275	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 17, 2023

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. This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 393 of the DNAAF4 protein (p.Leu393Phe). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DNAAF4-related conditions. ClinVar contains an entry for this variant (Variation ID: 960625). 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 DNAAF4 protein function. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.066	T;T
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.91	D;.
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.88	D;D
MetaSVM	Uncertain	0.39	D
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Uncertain	0.70	T
PROVEAN	Uncertain	-2.5	.;D
REVEL	Uncertain	0.64
Sift	Uncertain	0.0090	.;D
Sift4G	Uncertain	0.0090	D;D
Polyphen		1.0	D;D
Vest4		0.78
MutPred		0.73		Gain of methylation at K394 (P = 0.037);Gain of methylation at K394 (P = 0.037);
MVP		0.89
MPC		0.33
ClinPred		0.99	D
GERP RS		5.6
Varity_R		0.39
gMVP		0.44

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: rs2057479362; hg19: chr15-55722954;