Genetic Variant BLM:c.2824-2333G>A (chr15-90788316-G-A) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBA1

The NM_000057.4(BLM):c.2824-2333G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.443 in 151,852 control chromosomes in the GnomAD database, including 17,207 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.44 ( 17207 hom., cov: 31)

Consequence

BLM
NM_000057.4 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.725

Publications

17 publications found

Variant links:

Genes affected

BLM (HGNC:1058): (BLM RecQ like helicase) The Bloom syndrome is an autosomal recessive disorder characterized by growth deficiency, microcephaly and immunodeficiency among others. It is caused by homozygous or compound heterozygous mutation in the gene encoding DNA helicase RecQ protein on chromosome 15q26. This Bloom-associated helicase unwinds a variety of DNA substrates including Holliday junction, and is involved in several pathways contributing to the maintenance of genome stability. Identification of pathogenic Bloom variants is required for heterozygote testing in at-risk families. [provided by RefSeq, May 2020]

BLM Gene-Disease associations (from GenCC):

Bloom syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Myriad Women’s Health, Labcorp Genetics (formerly Invitae), G2P, Laboratory for Molecular Medicine, Orphanet, Genomics England PanelApp, ClinGen
osteosarcoma
Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
breast cancer
Inheritance: AD Classification: NO_KNOWN Submitted by: Ambry Genetics
hereditary nonpolyposis colon cancer
Inheritance: AD Classification: NO_KNOWN Submitted by: Ambry Genetics

BLM links:

ENSG00000300894 (HGNC:):

ENSG00000300894 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-1.0).

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.713 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BLM	NM_000057.4 link	c.2824-2333G>A		intron_variant	Intron 14 of 21	ENST00000355112.8	NP_000048.1	P54132

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BLM	ENST00000355112.8 link	c.2824-2333G>A		intron_variant	Intron 14 of 21	1	NM_000057.4	ENSP00000347232.3		P54132

Frequencies

GnomAD3 genomes

AF:

0.443

AC:

67173

AN:

151734

Hom.:

17166

Cov.:

show subpopulations

Gnomad AFR

AF:

0.720

Gnomad AMI

AF:

0.319

Gnomad AMR

AF:

0.326

Gnomad ASJ

AF:

0.275

Gnomad EAS

AF:

0.293

Gnomad SAS

AF:

0.255

Gnomad FIN

AF:

0.384

Gnomad MID

AF:

0.301

Gnomad NFE

AF:

0.346

Gnomad OTH

AF:

0.398

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome

AF:

0.443

AC:

67274

AN:

151852

Hom.:

17207

Cov.:

AF XY:

0.436

AC XY:

32368

AN XY:

74194

show subpopulations

African (AFR)

AF:

0.720

AC:

29835

AN:

41418

American (AMR)

AF:

0.327

AC:

4986

AN:

15266

Ashkenazi Jewish (ASJ)

AF:

0.275

AC:

955

AN:

3470

East Asian (EAS)

AF:

0.294

AC:

1517

AN:

5164

South Asian (SAS)

AF:

0.254

AC:

1222

AN:

4808

European-Finnish (FIN)

AF:

0.384

AC:

4037

AN:

10508

Middle Eastern (MID)

AF:

0.303

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.346

AC:

23507

AN:

67910

Other (OTH)

AF:

0.397

AC:

836

AN:

2106

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.507

Heterozygous variant carriers

1695

3391

5086

6782

8477

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

580

1160

1740

2320

2900

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.366

Hom.:

46491

Bravo

AF:

0.452

Asia WGS

AF:

0.298

AC:

1037

AN:

3472

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-1.0

CADD

Benign

0.41

(source)

DANN

Benign

0.63

PhyloP100

-0.72

Mutation Taster

=100/0

polymorphism (auto)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over