7-66994211-C-G

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_016038.4(SBDS):c.258+1G>C variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.0000149 in 1,613,862 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

SBDS
NM_016038.4 splice_donor, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6O:1

Conservation

PhyloP100: 6.75

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 3.4, offset of 4, new splice context is: tggGTaaca. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.

PP5

Variant 7-66994211-C-G is Pathogenic according to our data. Variant chr7-66994211-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 21538.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SBDS	NM_016038.4 link	c.258+1G>C		splice_donor_variant, intron_variant	Intron 2 of 4	ENST00000246868.7	NP_057122.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SBDS	ENST00000246868.7 link	c.258+1G>C		splice_donor_variant, intron_variant	Intron 2 of 4	1	NM_016038.4	ENSP00000246868.2		Q9Y3A5

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251448

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135902

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000144

AC:

AN:

1461730

Hom.:

Cov.:

AF XY:

0.0000151

AC XY:

AN XY:

727164

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

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:

0.0000162

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152132

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74308

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000565

Hom.:

Bravo

AF:

0.0000151

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Shwachman-Diamond syndrome 1

Pathogenic:2Other:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.258+1G>C variant occurs in a canonical splice site (donor) and is therefore predicted to disrupt or distort the normal gene product. The c.258+1G>C variant has been reported in three studies and is found in a total of four patients with Shwachmann-Diamond syndrome in a compound heterozygous state (Boocock et al. 2003; Woloszynek et al. 2004; Hassan et al. 2009). The variant was absent from 148 controls and is not found in the 1000 Genomes Project, the Exome Sequencing Project, or the Exome Aggregation Consortium. The c.258+1G>C splice donor variant interrupts the intron 2 invariant splice donor site which results in the use of a cryptic splice donor site at cDNA position 251-252. The abnormally spliced mRNA results in a frameshift at amino acid position 84 with subsequent premature truncation of the protein after an additional three amino acids (Boocock et al. 2003; Woloszynek et al. 2004). A different variant at the c.258+2 position in the same intron 2 invariant splice donor site results in an identical frameshift and is one of the most common known pathogenic variants in the SBDS gene. Based on the collective evidence, the c.258+1G>C variant is classified as pathogenic for Shwachmann-Diamond syndrome. -

Feb 07, 2025

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

The c.258+1G>C variant in SBDS has been reported, in the compound heterozygous state, in at least 1 individual with Shwachman-Diamond syndrome (DOI:10.1016/j.rmedc.2009.02.001), and has been identified in 0.003% (2/74904) African/African American chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs113993992). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. The presence of a known pseudogene, SBDSP1, can impact the reliability of allele frequencies. This variant has also been reported in ClinVar (Variation ID: 21538) and has been interpreted as pathogenic by multiple submitters. This variant is located in the 5' splice region. SpliceAI predictions indicate use of an out-of-frame cryptic splice site 8 bases from the intron-exon boundary, providing evidence that this variant may cause a frameshift and lead to a premature termination codon downstream. This alteration is then predicted to lead to a truncated or absent protein. However, this information is not predictive enough to determine pathogenicity. This variant is also within the same splice donor/acceptor, ¬±1,2 dinucleotide as a known pathogenic variant (Variant ID: 3196). Loss of function of the SBDS gene is an established disease mechanism in autosomal recessive Shwachman-Diamond syndrome. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive Shwachman-Diamond syndrome. ACMG/AMP criteria applied: PVS1, PM2_supporting, PM3_supporting, PS1_supporting (Richards 2015). -

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Aplastic anemia

Pathogenic:1

Mar 13, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Pathogenic:1

Sep 21, 2023

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.258+1G>C intronic pathogenic mutation results from a G to C substitution one nucleotide after coding exon 2 of the SBDS gene. This mutation was first reported in two alleles from 158 unrelated families with at least one individual with Shwachman-Diamond syndrome (SDS) (Boocock GR et al. Nat. Genet., 2003 Jan;33:97-101). In another study, this mutation was identified in conjunction with the common c.258+2T>C pathogenic mutation in an individual suspected to have SDS; however, the phase of the alterations was not provided (Woloszynek JR et al. Blood, 2004 Dec;104:3588-90). In our internal cohort, this mutation was confirmed in trans with a complex allele including c.258+2T>C in an individual with pancytopenia, pancreatic insufficiency, and skeletal abnormalities. In addition to the clinical data presented in the literature, alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as a disease-causing mutation. -

Aplastic anemia;C4692625:Shwachman-Diamond syndrome 1

Pathogenic:1

Nov 22, 2021

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

SBDS NM_016038.3 exon 2 c.258+1G>C: This variant has been reported in the literature in at least 2 individuals (zygosity unclear) with Shwachman-Diamond Syndrome (Boocock 2003 PMID:12496757, Woloszynek 2004 PMID:15284109). This variant is present in 3/126700 European alleles in the Genome Aggregation Database (http://gnomad.broadinstitute.org/rs113993992). This variant is present in ClinVar (Variation ID:21538). Evolutionary conservation and computational predictive tools for this variant are limited or unavailable. Of note, this variant alters the consensus splice sequence (+/- 1,2) which is predicted to result in an absent or abnormal protein. Loss of function has been reported as a disease mechanism for this gene and disease (Woloszynek 2004 PMID:15284109). In summary, this variant is classified as pathogenic . -

not provided

Pathogenic:1

Jul 07, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Canonical splice site variant in intron 2 of the SBDS gene, for which loss-of-function is a known mechanism of disease (Nelson & Meyers, 2018); Not observed at a significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 28971907, 23351992, 20301722, 12496757, 17916435, 24898207, 15284109) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Pathogenic

0.36

CADD

Pathogenic

DANN

Uncertain

0.99

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.89

FATHMM_MKL

Pathogenic

0.99

GERP RS

4.3

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.94

SpliceAI score (max)

1.0

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.79

Position offset: 9

DS_DL_spliceai

1.0

Position offset: 1

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.

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