chr4-102529837-T-C

Position:

• chr4-102529837-T-C

Variant summary

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

The NM_001382628.1(NFKB1):​c.2T>C​(p.Met1?) variant causes a start lost, splice region 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. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: NFKB1 NM_001382628.1 start_lost, splice_region
• Scores: Splicing: ADA: 0.2222
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 3.37

Genes affected

NFKB1 (HGNC:7794): (nuclear factor kappa B subunit 1) This gene encodes a 105 kD protein which can undergo cotranslational processing by the 26S proteasome to produce a 50 kD protein. The 105 kD protein is a Rel protein-specific transcription inhibitor and the 50 kD protein is a DNA binding subunit of the NF-kappa-B (NFKB) protein complex. NFKB is a transcription regulator that is activated by various intra- and extra-cellular stimuli such as cytokines, oxidant-free radicals, ultraviolet irradiation, and bacterial or viral products. Activated NFKB translocates into the nucleus and stimulates the expression of genes involved in a wide variety of biological functions. Inappropriate activation of NFKB has been associated with a number of inflammatory diseases while persistent inhibition of NFKB leads to inappropriate immune cell development or delayed cell growth. NFKB is a critical regulator of the immediate-early response to viral infection. Alternative splicing results in multiple transcript variants encoding different isoforms, at least one of which is proteolytically processed. [provided by RefSeq, Aug 2020]

NFKB1 (HGNC:):

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
NFKB1	NM_003998.4	c.41T>C	p.Met14Thr	missense_variant, splice_region_variant	3/24	ENST00000226574.9	NP_003989.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NFKB1	ENST00000226574.9	c.41T>C	p.Met14Thr	missense_variant, splice_region_variant	3/24	1	NM_003998.4	ENSP00000226574.4
NFKB1	ENST00000505458.5	c.41T>C	p.Met14Thr	missense_variant, splice_region_variant	3/24	1		ENSP00000424790.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 23, 2020	This sequence change replaces methionine with threonine at codon 14 of the NFKB1 protein (p.Met14Thr). The methionine residue is highly conserved and there is a moderate physicochemical difference between methionine and threonine. 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: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with NFKB1-related conditions. This variant is not present in population databases (ExAC no frequency). -
Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2022	NFKB1: PM2 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.058	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.18	.;T;.;.;T;T
Eigen	Benign	0.057
Eigen_PC	Benign	0.17
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.66	T;.;T;T;T;T
M_CAP	Benign	0.0085	T
MetaRNN	Benign	0.19	T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.9	L;L;.;.;L;.
MutationTaster	Benign	0.98	D;D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-1.1	N;N;N;N;N;N
REVEL	Benign	0.085
Sift	Pathogenic	0.0	D;D;D;T;D;D
Sift4G	Uncertain	0.015	D;D;D;D;D;D
Polyphen		0.77	P;P;.;.;P;.
Vest4		0.49
MutPred		0.24		Gain of glycosylation at M14 (P = 0.0381);Gain of glycosylation at M14 (P = 0.0381);.;.;Gain of glycosylation at M14 (P = 0.0381);Gain of glycosylation at M14 (P = 0.0381);
MVP		0.52
MPC		1.3
ClinPred		0.89	D
GERP RS		5.0
Varity_R		0.55
gMVP		0.59

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.22
dbscSNV1_RF	Benign	0.42
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: rs1741168290; hg19: chr4-103450994;