rs776836168

Positions:

• chr3-52349229-G-A

Variant summary

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

The NM_015512.5(DNAH1):​c.2335G>A​(p.Val779Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,544 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: DNAH1 NM_015512.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.42

Genes affected

DNAH1 (HGNC:2940): (dynein axonemal heavy chain 1) This gene encodes an inner dynein arm heavy chain that provides structural support between the radial spokes and the outer doublet of the sperm tail. Naturally occurring mutations in this gene are associated with primary ciliary dyskinesia and multiple morphological anomalies of the flagella that result in asthenozoospermia and male infertility. Mice with a homozygous knockout of the orthologous gene are viable but have reduced sperm motility and are infertile. [provided by RefSeq, Feb 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DNAH1	NM_015512.5	c.2335G>A	p.Val779Met	missense_variant	14/78	ENST00000420323.7	NP_056327.4
DNAH1	XM_017006129.2	c.2335G>A	p.Val779Met	missense_variant	15/80		XP_016861618.1
DNAH1	XM_017006130.2	c.2335G>A	p.Val779Met	missense_variant	15/79		XP_016861619.1
DNAH1	XM_017006131.2	c.2335G>A	p.Val779Met	missense_variant	15/79		XP_016861620.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DNAH1	ENST00000420323.7	c.2335G>A	p.Val779Met	missense_variant	14/78	1	NM_015512.5	ENSP00000401514	P1
DNAH1	ENST00000486752.5	n.2596G>A		non_coding_transcript_exon_variant	14/77	2
DNAH1	ENST00000497875.1	n.2500G>A		non_coding_transcript_exon_variant	15/21	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461544 Hom.: 0 Cov.: 34 AF XY: 0.00000413 AC XY: 3 AN XY: 727062

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: 0.00000270

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000113

ExAC AF: 0.00000826 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Spermatogenic failure 18;C4539798:Ciliary dyskinesia, primary, 37 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 11, 2021

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 779 of the DNAH1 protein (p.Val779Met). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DNAH1-related conditions. ClinVar contains an entry for this variant (Variation ID: 478427). 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: "Benign"; Align-GVGD: "Class C0"). 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	Benign	0.17
BayesDel_addAF	Benign	-0.091	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	23
DANN	Uncertain	0.99
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.34
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.0073	T
MetaRNN	Uncertain	0.59	D
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.13
Sift	Benign	0.075	T
Sift4G	Benign	0.15	T
Vest4		0.65
MutPred		0.66		Gain of catalytic residue at V779 (P = 0.1965);
MVP		0.44
MPC		0.14
ClinPred		0.82	D
GERP RS		5.5
gMVP		0.54

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

LitVar

Other links and lift over

dbSNP: rs776836168; hg19: chr3-52383245;