Genetic Variant SBDS:p.Cys216Tyr (chr7-66988477-C-T) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1PM2BP4

The NM_016038.4(SBDS):c.647G>A(p.Cys216Tyr) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

SBDS
NM_016038.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.30

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 Uncertain_significance. Variant got 3 ACMG points.

PM1

In a chain Ribosome maturation protein SBDS (size 248) in uniprot entity SBDS_HUMAN there are 4 pathogenic changes around while only 1 benign (80%) in NM_016038.4

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.3509229).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SBDS	NM_016038.4 link	c.647G>A	p.Cys216Tyr	missense_variant	Exon 5 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.647G>A	p.Cys216Tyr	missense_variant	Exon 5 of 5	1	NM_016038.4	ENSP00000246868.2		Q9Y3A5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1461510

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727066

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Dec 01, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.C216Y variant (also known as c.647G>A), located in coding exon 5 of the SBDS gene, results from a G to A substitution at nucleotide position 647. The cysteine at codon 216 is replaced by tyrosine, an amino acid with highly dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Pathogenic

0.36

BayesDel_noAF

Pathogenic

0.28

CADD

Benign

DANN

Benign

0.50

DEOGEN2

Uncertain

0.54

D;T

Eigen

Benign

-0.21

Eigen_PC

Benign

0.017

FATHMM_MKL

Uncertain

0.92

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Uncertain

0.093

MetaRNN

Benign

0.35

T;T

MetaSVM

Uncertain

0.057

MutationAssessor

Benign

0.78

N;.

PrimateAI

Uncertain

0.57

PROVEAN

Benign

-1.8

N;.

REVEL

Uncertain

0.63

Sift

Benign

1.0

T;.

Sift4G

Benign

1.0

T;T

Polyphen

0.0020

B;.

Vest4

0.50

MutPred

0.44

Loss of sheet (P = 0.1907);Loss of sheet (P = 0.1907);

MVP

0.93

MPC

0.78

ClinPred

0.64

GERP RS

5.0

Varity_R

0.85

gMVP

0.72

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

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