19-33302236-G-A

Position:

• chr19-33302236-G-A

Variant summary

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

The NM_004364.5(CEBPA):​c.179C>T​(p.Thr60Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000224 in 1,341,120 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000022 (0 hom.)
• Consequence: CEBPA NM_004364.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.855

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 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
CEBPA	NM_004364.5	c.179C>T	p.Thr60Met	missense_variant	1/1	ENST00000498907.3	NP_004355.2
CEBPA	NM_001287424.2	c.284C>T	p.Thr95Met	missense_variant	1/1		NP_001274353.1
CEBPA	NM_001287435.2	c.137C>T	p.Thr46Met	missense_variant	1/1		NP_001274364.1
CEBPA	NM_001285829.2	c.-179C>T		5_prime_UTR_variant	1/1		NP_001272758.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CEBPA	ENST00000498907.3	c.179C>T	p.Thr60Met	missense_variant	1/1		NM_004364.5	ENSP00000427514	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000937 AC: 1 AN: 106676 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 58920

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.000141

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000224 AC: 3 AN: 1341120 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 661340

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: 0.00000286

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000312 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Acute myeloid leukemia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 23, 2023

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 60 of the CEBPA protein (p.Thr60Met). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. 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: 408746). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.66
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.46	T
Eigen	Benign	0.13
Eigen_PC	Benign	0.12
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.89	D
M_CAP	Pathogenic	0.92	D
MetaRNN	Uncertain	0.49	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.97	L
MutationTaster	Benign	0.98	N
PrimateAI	Pathogenic	0.96	D
PROVEAN	Benign	-1.7	N
REVEL	Benign	0.063
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.050	T
Polyphen		1.0	D
Vest4		0.24
MutPred		0.23		Gain of sheet (P = 0.0221);
MVP		0.45
ClinPred		0.39	T
GERP RS		2.9
Varity_R		0.21
gMVP		0.39

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: rs1060502119; hg19: chr19-33793142;