20-50191538-C-T

Variant names:

• chr20-50191538-C-T
• rs2081577990
• NM_005194.4:c.505C>T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_005194.4(CEBPB):​c.505C>T​(p.Pro169Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000012 in 1,162,710 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 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)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: CEBPB NM_005194.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.76

Genes affected

CEBPB (HGNC:1834): (CCAAT enhancer binding protein beta) This intronless gene encodes a transcription factor that contains a basic leucine zipper (bZIP) domain. The encoded protein functions as a homodimer but can also form heterodimers with CCAAT/enhancer-binding proteins alpha, delta, and gamma. Activity of this protein is important in the regulation of genes involved in immune and inflammatory responses, among other processes. The use of alternative in-frame AUG start codons results in multiple protein isoforms, each with distinct biological functions. [provided by RefSeq, Oct 2013]

CEBPB-AS1 (HGNC:51226): (CEBPB antisense RNA 1)

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.22986558).
• BS2: High AC in GnomAdExome4 at 14 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CEBPB	NM_005194.4	c.505C>T	p.Pro169Ser	missense_variant	Exon 1 of 1	ENST00000303004.5	NP_005185.2
CEBPB	NM_001285878.1	c.436C>T	p.Pro146Ser	missense_variant	Exon 1 of 1		NP_001272807.1
CEBPB	NM_001285879.1	c.-90C>T		5_prime_UTR_variant	Exon 1 of 1		NP_001272808.1
CEBPB-AS1	NR_125739.1	n.407-116G>A		intron_variant	Intron 1 of 6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CEBPB	ENST00000303004.5	c.505C>T	p.Pro169Ser	missense_variant	Exon 1 of 1	6	NM_005194.4	ENSP00000305422.3
CEBPB-AS1	ENST00000613921.1	n.-40G>A		upstream_gene_variant		3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000120 AC: 14 AN: 1162710 Hom.: 0 Cov.: 33 AF XY: 0.0000106 AC XY: 6 AN XY: 564416

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: 0.0000134

Gnomad4 OTH exome AF: 0.0000214

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jun 07, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.505C>T (p.P169S) alteration is located in exon 1 (coding exon 1) of the CEBPB gene. This alteration results from a C to T substitution at nucleotide position 505, causing the proline (P) at amino acid position 169 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Benign	0.15	T
Eigen	Benign	-0.53
Eigen_PC	Benign	-0.37
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.42	T
M_CAP	Pathogenic	0.84	D
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	1.1	L
PrimateAI	Pathogenic	0.89	D
PROVEAN	Benign	-0.51	N
REVEL	Benign	0.20
Sift	Benign	0.19	T
Sift4G	Benign	0.54	T
Polyphen		0.043	B
Vest4		0.14
MutPred		0.33		Gain of phosphorylation at P169 (P = 0.0026);
MVP		0.92
MPC		1.4
ClinPred		0.20	T
GERP RS		2.4
Varity_R		0.14
gMVP		0.25

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: rs2081577990; hg19: chr20-48808075;