Genetic Variant DNAAF4:p.Arg270Gly (chr15-55439557-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_130810.4(DNAAF4):c.808C>G(p.Arg270Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,648 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R270Q) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

DNAAF4
NM_130810.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.70

Publications

3 publications found

Variant links:

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 links:

DNAAF4-CCPG1 (HGNC:43019): (DNAAF4-CCPG1 readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring dyslexia susceptibility 1 candidate 1 (DYX1C1) and cell cycle progression 1 (CCPG1) genes on chromosome 15. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is thus unlikely to produce a protein product. [provided by RefSeq, Mar 2011]

DNAAF4-CCPG1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNAAF4	NM_130810.4 link	c.808C>G	p.Arg270Gly	missense_variant	Exon 7 of 10	ENST00000321149.7	NP_570722.2	Q8WXU2-1
DNAAF4	NM_001033560.2 link	c.808C>G	p.Arg270Gly	missense_variant	Exon 7 of 9		NP_001028732.1	Q8WXU2-2A0A0S2Z5Z4
DNAAF4	NM_001033559.3 link	c.808C>G	p.Arg270Gly	missense_variant	Exon 7 of 9		NP_001028731.1	Q8WXU2-3
DNAAF4-CCPG1	NR_037923.1 link	n.1063C>G		non_coding_transcript_exon_variant	Exon 6 of 16

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNAAF4	ENST00000321149.7 link	c.808C>G	p.Arg270Gly	missense_variant	Exon 7 of 10	1	NM_130810.4	ENSP00000323275.3		Q8WXU2-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461648

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727146

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53308

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111918

Other (OTH)

AF:

0.00

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

0.0035

BayesDel_noAF

Benign

-0.23

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.10

.;.;T;T

Eigen

Uncertain

0.25

Eigen_PC

Benign

0.16

FATHMM_MKL

Uncertain

0.89

LIST_S2

Uncertain

0.92

D;D;D;.

M_CAP

Benign

0.044

MetaRNN

Uncertain

0.69

D;D;D;D

MetaSVM

Benign

-0.55

PhyloP100

1.7

PrimateAI

Benign

0.33

PROVEAN

Pathogenic

-5.7

D;D;D;D

REVEL

Uncertain

0.35

Sift

Uncertain

0.0040

D;D;D;D

Sift4G

Uncertain

0.0040

D;D;D;D

Polyphen

0.90

P;P;D;D

Vest4

0.61

MutPred

0.46

Loss of stability (P = 0.0466);Loss of stability (P = 0.0466);Loss of stability (P = 0.0466);Loss of stability (P = 0.0466);

MVP

0.82

MPC

0.25

ClinPred

0.99

GERP RS

2.0

Varity_R

0.56

gMVP

0.73

Mutation Taster

=67/33

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over