chr7-37850421-A-G

Position:

• chr7-37850421-A-G

Variant summary

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

The NM_016616.5(NME8):​c.77A>G​(p.Asn26Ser) 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. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: NME8 NM_016616.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.20

Genes affected

NME8 (HGNC:16473): (NME/NM23 family member 8) This gene encodes a protein with an N-terminal thioredoxin domain and three C-terminal nucleoside diphosphate kinase (NDK) domains, but the NDK domains are thought to be catalytically inactive. The sea urchin ortholog of this gene encodes a component of sperm outer dynein arms, and the protein is implicated in ciliary function. Mutations in this gene are implicated in primary ciliary dyskinesia type 6.[provided by RefSeq, Nov 2009]

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=0.17852879).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NME8	NM_016616.5	c.77A>G	p.Asn26Ser	missense_variant	4/18	ENST00000199447.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NME8	ENST00000199447.9	c.77A>G	p.Asn26Ser	missense_variant	4/18	1	NM_016616.5	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia 6 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 20, 2017

In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with an NME8-related disease. This sequence change replaces asparagine with serine at codon 26 of the NME8 protein (p.Asn26Ser). The asparagine residue is moderately conserved and there is a small physicochemical difference between asparagine and serine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.73
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0032	T;T
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.33
FATHMM_MKL	Benign	0.75	D
LIST_S2	Benign	0.45	.;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.18	T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	1.1	L;L
MutationTaster	Benign	1.0	D;N;N
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.7	N;N
REVEL	Benign	0.15
Sift	Benign	0.73	T;T
Sift4G	Benign	0.38	T;T
Polyphen		0.59	P;P
Vest4		0.40
MutPred		0.47		Loss of catalytic residue at N26 (P = 0.0266);Loss of catalytic residue at N26 (P = 0.0266);
MVP		0.39
MPC		0.15
ClinPred		0.85	D
GERP RS		4.0
Varity_R		0.057
gMVP		0.15

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1554360744; hg19: chr7-37890023; COSMIC: COSV52252689;