7-66994329-G-A

Variant names:

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_016038.4(SBDS):c.141C>T(p.Leu47Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00452 in 1,612,664 control chromosomes in the GnomAD database, including 45 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0076 ( 9 hom., cov: 32)

Exomes 𝑓: 0.0042 ( 36 hom. )

Consequence

SBDS
NM_016038.4 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:8

Conservation

PhyloP100: -0.801

Publications

10 publications found

Variant links:

Genes affected

SBDS (HGNC:19440): (SBDS ribosome maturation factor) This gene encodes a highly conserved protein that plays an essential role in ribosome biogenesis. The encoded protein interacts with elongation factor-like GTPase 1 to disassociate eukaryotic initiation factor 6 from the late cytoplasmic pre-60S ribosomal subunit allowing assembly of the 80S subunit. Mutations within this gene are associated with the autosomal recessive disorder Shwachman-Bodian-Diamond syndrome. This gene has a closely linked pseudogene that is distally located. [provided by RefSeq, Jan 2017]

SBDS Gene-Disease associations (from GenCC):

Shwachman-Diamond syndrome
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
Shwachman-Diamond syndrome 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia

SBDS links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.52).

BP6

Variant 7-66994329-G-A is Benign according to our data. Variant chr7-66994329-G-A is described in ClinVar as Benign. ClinVar VariationId is 21536.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-0.801 with no splicing effect.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.00765 (1163/152066) while in subpopulation EAS AF = 0.0334 (173/5182). AF 95% confidence interval is 0.0293. There are 9 homozygotes in GnomAd4. There are 590 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 9 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SBDS	NM_016038.4 link	c.141C>T	p.Leu47Leu	synonymous_variant	Exon 2 of 5	ENST00000246868.7	NP_057122.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SBDS	ENST00000246868.7 link	c.141C>T	p.Leu47Leu	synonymous_variant	Exon 2 of 5	1	NM_016038.4	ENSP00000246868.2

Frequencies

GnomAD3 genomes

AF:

0.00763

AC:

1159

AN:

151950

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00427

Gnomad ASJ

AF:

0.00259

Gnomad EAS

AF:

0.0333

Gnomad SAS

AF:

0.00831

Gnomad FIN

AF:

0.00397

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00447

Gnomad OTH

AF:

0.0115

GnomAD2 exomes

AF:

0.00653

AC:

1641

AN:

251316

AF XY:

0.00599

show subpopulations

Gnomad AFR exome

AF:

0.0126

Gnomad AMR exome

AF:

0.00309

Gnomad ASJ exome

AF:

0.00258

Gnomad EAS exome

AF:

0.0336

Gnomad FIN exome

AF:

0.00343

Gnomad NFE exome

AF:

0.00361

Gnomad OTH exome

AF:

0.00538

GnomAD4 exome

AF:

0.00419

AC:

6123

AN:

1460598

Hom.:

Cov.:

AF XY:

0.00422

AC XY:

3065

AN XY:

726670

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0105

AC:

352

AN:

33432

American (AMR)

AF:

0.00333

AC:

149

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00237

AC:

AN:

26108

East Asian (EAS)

AF:

0.0250

AC:

993

AN:

39652

South Asian (SAS)

AF:

0.00584

AC:

503

AN:

86202

European-Finnish (FIN)

AF:

0.00305

AC:

163

AN:

53356

Middle Eastern (MID)

AF:

0.0144

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00309

AC:

3438

AN:

1111012

Other (OTH)

AF:

0.00630

AC:

380

AN:

60362

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.396

Heterozygous variant carriers

263

525

788

1050

1313

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

136

272

408

544

680

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00765

AC:

1163

AN:

152066

Hom.:

Cov.:

AF XY:

0.00794

AC XY:

590

AN XY:

74334

show subpopulations

African (AFR)

AF:

0.0121

AC:

504

AN:

41496

American (AMR)

AF:

0.00426

AC:

AN:

15252

Ashkenazi Jewish (ASJ)

AF:

0.00259

AC:

AN:

3472

East Asian (EAS)

AF:

0.0334

AC:

173

AN:

5182

South Asian (SAS)

AF:

0.00832

AC:

AN:

4808

European-Finnish (FIN)

AF:

0.00397

AC:

AN:

10580

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00447

AC:

304

AN:

67956

Other (OTH)

AF:

0.0118

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

121

181

242

302

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<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:

0.00478

Hom.:

Bravo

AF:

0.00747

EpiCase

AF:

0.00486

EpiControl

AF:

0.00362

ClinVar

Significance: Benign

Submissions summary: Benign:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Mar 03, 2015

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jun 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

SBDS: BP4, BP7, BS1, BS2

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

Shwachman-Diamond syndrome 1

Benign:2

Jul 20, 2016

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Jul 28, 2017

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not specified

Benign:1

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Inborn genetic diseases

Benign:1

Jul 31, 2017

Ambry Genetics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

Hereditary cancer-predisposing syndrome

Benign:1

May 18, 2025

Molecular Diagnostics Laboratory, Catalan Institute of Oncology

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BA1 c.141C>T, located in exon 2 of the SBDS gene, is predicted to result in no amino acid change, p.(Leu47=). R24This variant is found in 641/19234 (8 homozygotes) with a filter allele frequency of 3% at 99% confidence in the gnomAD v2.1.1 database (East Asian non-cancer data set)(BA1). The SpliceAI algorithm predicts no significant impact on splicing. This variant has been only reported in ClinVar database (7x benign) and in the LOVD database (3x benign). Based on currently available information, the variant c.141C>T is classified as a benign variant according to ACMG guidelines.

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.52

CADD

Benign

6.7

(source)

DANN

Benign

0.75

PhyloP100

-0.80

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.080

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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over