chr22-23290381-T-A

Position:

• chr22-23290381-T-A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_004327.4(BCR):​c.2750T>A​(p.Val917Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as not provided (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: BCR NM_004327.4 missense
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 7.77

Genes affected

BCR (HGNC:1014): (BCR activator of RhoGEF and GTPase) A reciprocal translocation between chromosomes 22 and 9 produces the Philadelphia chromosome, which is often found in patients with chronic myelogenous leukemia. The chromosome 22 breakpoint for this translocation is located within the BCR gene. The translocation produces a fusion protein which is encoded by sequence from both BCR and ABL, the gene at the chromosome 9 breakpoint. Although the BCR-ABL fusion protein has been extensively studied, the function of the normal BCR gene product is not clear. The unregulated tyrosine kinase activity of BCR-ABL1 contributes to the immortality of leukaemic cells. The BCR protein has serine/threonine kinase activity and is a GTPase-activating protein for p21rac and other kinases. Two transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Jan 2020]

BCR (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.949

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BCR	NM_004327.4	c.2750T>A	p.Val917Asp	missense_variant	14/23	ENST00000305877.13	NP_004318.3
BCR	NM_021574.3	c.2750T>A	p.Val917Asp	missense_variant	14/22		NP_067585.2
LOC107985554	XR_001755448.2	n.148A>T		non_coding_transcript_exon_variant	1/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BCR	ENST00000305877.13	c.2750T>A	p.Val917Asp	missense_variant	14/23	1	NM_004327.4	ENSP00000303507.8
BCR	ENST00000359540.7	c.2750T>A	p.Val917Asp	missense_variant	14/22	1		ENSP00000352535.3
BCR	ENST00000487968.5	n.2120T>A		non_coding_transcript_exon_variant	5/5	2
BCR	ENST00000419722.6	n.7+760T>A		intron_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

Chronic myelogenous leukemia, BCR-ABL1 positive Other:1

not provided, no classification provided

literature only

Laboratory of Molecular Diagnostics and Monitoring of CML and Ph+ Leukemias, Institute of Hematology and Blood Transfusion

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.41
CADD	Pathogenic	30
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.83	D;.
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D;D
M_CAP	Pathogenic	0.53	D
MetaRNN	Pathogenic	0.95	D;D
MetaSVM	Uncertain	0.65	D
MutationAssessor	Pathogenic	2.9	M;M
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-5.6	D;D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.97
MutPred		0.79		Loss of sheet (P = 0.0181);Loss of sheet (P = 0.0181);
MVP		0.97
MPC		1.5
ClinPred		1.0	D
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.95
gMVP		0.95

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: rs527236143; hg19: chr22-23632568;