chr19-33302197-A-C

Position:

• chr19-33302197-A-C

Variant summary

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

The NM_004364.5(CEBPA):​c.218T>G​(p.Phe73Cys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CEBPA NM_004364.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.84

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.218T>G	p.Phe73Cys	missense_variant	1/1	ENST00000498907.3	NP_004355.2
CEBPA	NM_001287424.2	c.323T>G	p.Phe108Cys	missense_variant	1/1		NP_001274353.1
CEBPA	NM_001287435.2	c.176T>G	p.Phe59Cys	missense_variant	1/1		NP_001274364.1
CEBPA	NM_001285829.2	c.-140T>G		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.218T>G	p.Phe73Cys	missense_variant	1/1		NM_004364.5	ENSP00000427514	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

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

Jun 01, 2019

This sequence change replaces phenylalanine with cysteine at codon 73 of the CEBPA protein (p.Phe73Cys). The phenylalanine residue is moderately conserved and there is a large physicochemical difference between phenylalanine and cysteine. While this variant is not present in population databases, the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This variant has not been reported in the literature in individuals with CEBPA-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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	1.0
BayesDel_addAF	Benign	0.0043	T
BayesDel_noAF	Benign	-0.23
CADD	Pathogenic	29
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.42	T
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.84	T
M_CAP	Pathogenic	0.96	D
MetaRNN	Uncertain	0.66	D
MetaSVM	Benign	-0.82	T
MutationAssessor	Uncertain	2.0	M
MutationTaster	Benign	0.96	D
PrimateAI	Pathogenic	0.98	D
PROVEAN	Uncertain	-2.4	N
REVEL	Benign	0.28
Sift	Benign	0.15	T
Sift4G	Benign	0.10	T
Polyphen		1.0	D
Vest4		0.50
MutPred		0.43		Loss of catalytic residue at F73 (P = 0.0337);
MVP		0.54
ClinPred		0.92	D
GERP RS		4.1
Varity_R		0.42
gMVP		0.41

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: rs1555742258; hg19: chr19-33793103;