2-209772141-G-T

Variant names:

• chr2-209772141-G-T
• rs906070422
• NM_001371986.1:c.69G>T

Variant summary

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

The NM_001371986.1(UNC80):​c.69G>T​(p.Gln23His) variant causes a missense change. The variant allele was found at a frequency of 0.00000143 in 1,395,670 control chromosomes in the GnomAD database, with no homozygous occurrence. 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)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: UNC80 NM_001371986.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.79

Genes affected

UNC80 (HGNC:26582): (unc-80 homolog, NALCN channel complex subunit) The protein encoded by this gene is a component of a voltage-independent 'leak' ion-channel complex, in which it performs essential functions, such as serving as a bridge between two other components (sodium leak channel non-selective and UNC79) and as a scaffold for Src kinases. Leak channels play an importnat role in establishment and maintenance of resting membrane potentials in neurons. Mutations in this gene are associated with congenital infantile encephalopathy, intellectual disability and growth issues. [provided by RefSeq, Aug 2016]

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, 0.847

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UNC80	NM_001371986.1	c.69G>T	p.Gln23His	missense_variant	Exon 1 of 65	ENST00000673920.1	NP_001358915.1
UNC80	NM_032504.2	c.69G>T	p.Gln23His	missense_variant	Exon 1 of 64		NP_115893.1
UNC80	NM_182587.4	c.69G>T	p.Gln23His	missense_variant	Exon 1 of 63		NP_872393.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UNC80	ENST00000673920.1	c.69G>T	p.Gln23His	missense_variant	Exon 1 of 65		NM_001371986.1	ENSP00000501211.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000143 AC: 2 AN: 1395670 Hom.: 0 Cov.: 31 AF XY: 0.00000145 AC XY: 1 AN XY: 688456

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: 0.00000186

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Mar 06, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamine, which is neutral and polar, with histidine, which is basic and polar, at codon 23 of the UNC80 protein (p.Gln23His). This variant is not present in population databases (gnomAD no frequency). 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. 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: "Not Available"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Not Available"). This variant has not been reported in the literature in individuals affected with UNC80-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.090
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.35	T;.
Eigen	Uncertain	0.28
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Benign	0.22	N
LIST_S2	Uncertain	0.96	D;D
M_CAP	Pathogenic	0.61	D
MetaRNN	Pathogenic	0.85	D;D
MetaSVM	Benign	-0.58	T
MutationAssessor	Benign	2.0	M;M
PrimateAI	Pathogenic	0.96	D
PROVEAN	Uncertain	-2.8	D;D
REVEL	Uncertain	0.38
Sift	Uncertain	0.0050	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.99	D;.
Vest4		0.75
MutPred		0.54		Loss of MoRF binding (P = 0.0949);Loss of MoRF binding (P = 0.0949);
MVP		0.34
MPC		0.64
ClinPred		0.97	D
GERP RS		4.3
Varity_R		0.67
gMVP		0.92

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: rs906070422; hg19: chr2-210636865;