19-13135251-G-A

Position:

• chr19-13135251-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The ENST00000292431.5(NACC1):​c.44G>A​(p.Ser15Asn) 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: 32)
• Consequence: NACC1 ENST00000292431.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.82

Genes affected

NACC1 (HGNC:20967): (nucleus accumbens associated 1) This gene encodes a member of the BTB/POZ protein family. BTB/POZ proteins are involved in several cellular processes including proliferation, apoptosis and transcription regulation. The encoded protein is a transcriptional repressor that plays a role in stem cell self-renewal and pluripotency maintenance. The encoded protein also suppresses transcription of the candidate tumor suppressor Gadd45GIP1, and expression of this gene may play a role in the progression of multiple types of cancer. A pseudogene of this gene is located on the short arm of chromosome 9. [provided by RefSeq, Feb 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), NACC1. . Gene score misZ 4.1668 (greater than the threshold 3.09). Trascript score misZ 3.946 (greater than threshold 3.09). GenCC has associacion of gene with neurodevelopmental disorder with epilepsy, cataracts, feeding difficulties, and delayed brain myelination, NACC1-related neurodevelopmental disorder with epilepsy, cataracts and episodic irritability.
• BP4: Computational evidence support a benign effect (MetaRNN=0.13226548).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NACC1	NM_052876.4	c.44G>A	p.Ser15Asn	missense_variant	2/6	ENST00000292431.5	NP_443108.1
NACC1	XM_005259721.4	c.44G>A	p.Ser15Asn	missense_variant	3/7		XP_005259778.1
NACC1	XM_047438118.1	c.44G>A	p.Ser15Asn	missense_variant	2/6		XP_047294074.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NACC1	ENST00000292431.5	c.44G>A	p.Ser15Asn	missense_variant	2/6	1	NM_052876.4	ENSP00000292431	P1
NACC1	ENST00000586171.3	c.44G>A	p.Ser15Asn	missense_variant	3/7	5		ENSP00000467120	P1
NACC1	ENST00000700232.1	c.44G>A	p.Ser15Asn	missense_variant	2/6			ENSP00000514870	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

Jan 25, 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. 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 not expected to disrupt NACC1 protein function. This variant has not been reported in the literature in individuals affected with NACC1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces serine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 15 of the NACC1 protein (p.Ser15Asn). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.73
CADD	Benign	23
DANN	Uncertain	0.98
DEOGEN2	Benign	0.032	T;T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.14
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.77	T;T
M_CAP	Benign	0.0034	T
MetaRNN	Benign	0.13	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.1	.;L
MutationTaster	Benign	0.78	N
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.5	.;N
REVEL	Benign	0.11
Sift	Benign	0.30	.;T
Sift4G	Benign	0.33	T;T
Polyphen		0.0010	.;B
Vest4		0.070
MutPred		0.34		Loss of helix (P = 0.3949);Loss of helix (P = 0.3949);
MVP		0.14
MPC		1.1
ClinPred		0.23	T
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.29
gMVP		0.46

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: rs2019685284; hg19: chr19-13246065;