Genetic Variant STT3B:p.Thr75Thr (chr3-31533223-C-T) – ACMG Classification: Benign (-7 pts)

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 0P and 7B. BP4_StrongBP6_ModerateBP7

The NM_178862.3(STT3B):c.225C>T(p.Thr75Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000567 in 1,481,742 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000058 ( 1 hom. )

Consequence

STT3B
NM_178862.3 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 1.92

Publications

0 publications found

Variant links:

Genes affected

STT3B (HGNC:30611): (STT3 oligosaccharyltransferase complex catalytic subunit B) The protein encoded by this gene is a catalytic subunit of a protein complex that transfers oligosaccharides onto asparagine residues. Defects in this gene are a cause of congenital disorder of glycosylation Ix (CDG1X). [provided by RefSeq, Jun 2014]

STT3B Gene-Disease associations (from GenCC):

STT3B-congenital disorder of glycosylation
Inheritance: AR, Unknown Classification: SUPPORTIVE, LIMITED Submitted by: G2P, PanelApp Australia, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)

STT3B links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

BP4

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

BP6

Variant 3-31533223-C-T is Benign according to our data. Variant chr3-31533223-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 1589528.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=1.92 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_178862.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STT3B	NM_178862.3	MANE Select	c.225C>T	p.Thr75Thr	synonymous	Exon 1 of 16	NP_849193.1	Q8TCJ2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
STT3B	ENST00000295770.4	TSL:1 MANE Select	c.225C>T	p.Thr75Thr	synonymous	Exon 1 of 16	ENSP00000295770.2	Q8TCJ2
STT3B	ENST00000453168.5	TSL:1	n.586C>T		non_coding_transcript_exon	Exon 1 of 10
STT3B	ENST00000935233.1		c.225C>T	p.Thr75Thr	synonymous	Exon 1 of 16	ENSP00000605292.1

Frequencies

GnomAD3 genomes

AF:

0.0000462

AC:

AN:

151642

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000197

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:

0.0000442

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000551

AC:

AN:

108856

AF XY:

0.0000667

show subpopulations

Gnomad AFR exome

AF:

0.000250

Gnomad AMR exome

AF:

0.000237

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000247

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000579

AC:

AN:

1329992

Hom.:

Cov.:

AF XY:

0.0000503

AC XY:

AN XY:

656484

show subpopulations

African (AFR)

AF:

0.0000367

AC:

AN:

27244

American (AMR)

AF:

0.000256

AC:

AN:

27390

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

22818

East Asian (EAS)

AF:

0.00

AC:

AN:

28208

South Asian (SAS)

AF:

0.0000136

AC:

AN:

73312

European-Finnish (FIN)

AF:

0.00

AC:

AN:

47056

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5294

European-Non Finnish (NFE)

AF:

0.0000613

AC:

AN:

1044558

Other (OTH)

AF:

0.0000739

AC:

AN:

54112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<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:

0.0000461

AC:

AN:

151750

Hom.:

Cov.:

AF XY:

0.0000674

AC XY:

AN XY:

74176

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41496

American (AMR)

AF:

0.000197

AC:

AN:

15246

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5126

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10436

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.0000442

AC:

AN:

67842

Other (OTH)

AF:

0.00

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.546

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<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:

0.0000686

Hom.:

Bravo

AF:

0.0000756

ClinVar

ClinVar submissions

Significance:Likely benign

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

STT3B-congenital disorder of glycosylation (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.52

CADD

Benign

(source)

DANN

Uncertain

0.98

PhyloP100

1.9

PromoterAI

0.011

Neutral

(source)

Mutation Taster

=100/0

polymorphism

(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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over