rs1060502123

Positions:

• chr19-33302355-C-G

Variant summary

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

The NM_004364.5(CEBPA):​c.60G>C​(p.Gln20His) variant causes a missense change. The variant allele was found at a frequency of 0.0000205 in 1,169,970 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q20R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000021 (0 hom.)
• Consequence: CEBPA NM_004364.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 4.72

Genes affected

CEBPA (HGNC:1833): (CCAAT enhancer binding protein alpha) This intronless gene encodes a transcription factor that contains a basic leucine zipper (bZIP) domain and recognizes the CCAAT motif in the promoters of target genes. The encoded protein functions in homodimers and also heterodimers with CCAAT/enhancer-binding proteins beta and gamma. Activity of this protein can modulate the expression of genes involved in cell cycle regulation as well as in body weight homeostasis. Mutation of this gene is associated with acute myeloid leukemia. The use of alternative in-frame non-AUG (GUG) and AUG start codons results in protein isoforms with different lengths. Differential translation initiation is mediated by an out-of-frame, upstream open reading frame which is located between the GUG and the first AUG start codons. [provided by RefSeq, Dec 2013]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.22986072).
• BS2: High AC in GnomAdExome4 at 24 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CEBPA	NM_004364.5	c.60G>C	p.Gln20His	missense_variant	1/1	ENST00000498907.3
CEBPA	NM_001287424.2	c.165G>C	p.Gln55His	missense_variant	1/1
CEBPA	NM_001287435.2	c.18G>C	p.Gln6His	missense_variant	1/1
CEBPA	NM_001285829.2	c.-298G>C		5_prime_UTR_variant	1/1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CEBPA	ENST00000498907.3	c.60G>C	p.Gln20His	missense_variant	1/1		NM_004364.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000205 AC: 24 AN: 1169970 Hom.: 0 Cov.: 32 AF XY: 0.0000159 AC XY: 9 AN XY: 565934

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: 0.0000248

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Acute myeloid leukemia Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Nov 28, 2023	This sequence change replaces glutamine, which is neutral and polar, with histidine, which is basic and polar, at codon 20 of the CEBPA protein (p.Gln20His). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CEBPA-related conditions. ClinVar contains an entry for this variant (Variation ID: 408753). 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 CEBPA protein function with a negative predictive value of 80%. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Oct 21, 2023	- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

May 05, 2023

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 21455213, 16735515, 17671234) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.24	T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.19
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.52	T
M_CAP	Pathogenic	0.78	D
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.50	N
MutationTaster	Benign	0.99	D
PrimateAI	Pathogenic	0.93	D
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.069
Sift	Uncertain	0.0010	D
Sift4G	Benign	0.063	T
Polyphen		0.010	B
Vest4		0.20
MutPred		0.10		Gain of glycosylation at S17 (P = 0.1182);
MVP		0.44
ClinPred		0.57	D
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.18
gMVP		0.42

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: rs1060502123; hg19: chr19-33793261;