NM_004327.4:c.2707+21G>T

Variant names:

• chr22-23289642-G-T
• rs527236142
• NM_004327.4:c.2707+21G>T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004327.4(BCR):​c.2707+21G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000693 in 1,443,694 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 not provided (no stars).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: BCR NM_004327.4 intron
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: -0.837

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]

LOC107985554 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BCR	NM_004327.4	c.2707+21G>T		intron_variant	Intron 13 of 22	ENST00000305877.13	NP_004318.3
BCR	NM_021574.3	c.2707+21G>T		intron_variant	Intron 13 of 21		NP_067585.2
LOC107985554	XR_001755448.2	n.315+572C>A		intron_variant	Intron 1 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BCR	ENST00000305877.13	c.2707+21G>T		intron_variant	Intron 13 of 22	1	NM_004327.4	ENSP00000303507.8
BCR	ENST00000359540.7	c.2707+21G>T		intron_variant	Intron 13 of 21	1		ENSP00000352535.3
BCR	ENST00000487968.5	n.1381G>T		non_coding_transcript_exon_variant	Exon 5 of 5	2
BCR	ENST00000419722.6	n.7+21G>T		intron_variant	Intron 1 of 4	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.93e-7 AC: 1 AN: 1443694 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 719284

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: 9.13e-7

Gnomad4 OTH exome AF: 0.00

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

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

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	0.65
DANN	Benign	0.44

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: rs527236142; hg19: chr22-23631829;