Genetic Variant CEBPA:p.Pro187_Pro189dup (chr19-33301848-G-GGGCGGCGGC) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_004364.5(CEBPA):c.558_566dupGCCGCCGCC(p.Pro187_Pro189dup) variant causes a disruptive inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000229 in 1,310,768 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000068 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000017 ( 0 hom. )

Consequence

CEBPA
NM_004364.5 disruptive_inframe_insertion

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.21

Variant links:

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]

CEBPA links:

ENSG00000267727 (HGNC:):

ENSG00000267727 links:

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ACMG classification

Classification made for transcript

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 rank	MANE	Protein	UniProt
CEBPA	NM_004364.5 link	c.558_566dupGCCGCCGCC	p.Pro187_Pro189dup	disruptive_inframe_insertion	Exon 1 of 1	ENST00000498907.3	NP_004355.2	P49715-1
CEBPA	NM_001287424.2 link	c.663_671dupGCCGCCGCC	p.Pro222_Pro224dup	disruptive_inframe_insertion	Exon 1 of 1		NP_001274353.1	P49715-4
CEBPA	NM_001287435.2 link	c.516_524dupGCCGCCGCC	p.Pro173_Pro175dup	disruptive_inframe_insertion	Exon 1 of 1		NP_001274364.1	P49715-2
CEBPA	NM_001285829.2 link	c.201_209dupGCCGCCGCC	p.Pro68_Pro70dup	disruptive_inframe_insertion	Exon 1 of 1		NP_001272758.1	P49715-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CEBPA	ENST00000498907.3 link	c.558_566dupGCCGCCGCC	p.Pro187_Pro189dup	disruptive_inframe_insertion	Exon 1 of 1	6	NM_004364.5	ENSP00000427514.1		P49715-1
ENSG00000267727	ENST00000587312.1 link	n.403_411dupGGCGGCGGC		non_coding_transcript_exon_variant	Exon 2 of 2	3

Frequencies

GnomAD3 genomes

AF:

0.00000675

AC:

AN:

148062

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000244

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000172

AC:

AN:

1162706

Hom.:

Cov.:

AF XY:

0.00000176

AC XY:

AN XY:

568590

show subpopulations

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:

0.0000208

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000675

AC:

AN:

148062

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

72100

show subpopulations

Gnomad4 AFR

AF:

0.0000244

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Acute myeloid leukemia

Uncertain:1

Jul 08, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant, c.558_566dup, results in the insertion of 3 amino acid(s) of the CEBPA protein (p.Pro187_Pro189dup), but otherwise preserves the integrity of the reading frame. 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. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

19-33301848-GGGCGGCGGCGGC-GGGCGGCGGCGGCGGCGGCGGC

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over