chr5-177600217-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_007255.3(B4GALT7):c.7C>T(p.Pro3Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000905 in 1,391,766 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000096 ( 0 hom. )

Consequence

B4GALT7
NM_007255.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.461

Publications

1 publications found

Variant links:

Genes affected

B4GALT7 (HGNC:930): (beta-1,4-galactosyltransferase 7) This gene is a member of the beta-1,4-galactosyltransferase (beta4GalT) family. Family members encode type II membrane-bound glycoproteins that appear to have exclusive specificity for the donor substrate UDP-galactose. Each beta4GalT member has a distinct function in the biosynthesis of different glycoconjugates and saccharide structures. As type II membrane proteins, they have an N-terminal hydrophobic signal sequence that directs the protein to the Golgi apparatus which then remains uncleaved to function as a transmembrane anchor. The enzyme encoded by this gene attaches the first galactose in the common carbohydrate-protein linkage (GlcA-beta1,3-Gal-beta1,3-Gal-beta1,4-Xyl-beta1-O-Ser) found in proteoglycans. This enzyme differs from other beta4GalTs because it lacks the conserved Cys residues found in beta4GalT1-beta4GalT6 and it is located in cis-Golgi instead of trans-Golgi. Mutations in this gene have been associated with the progeroid form of Ehlers-Danlos syndrome. [provided by RefSeq, Oct 2009]

B4GALT7 Gene-Disease associations (from GenCC):

Ehlers-Danlos syndrome, spondylodysplastic type, 1
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia, G2P, Ambry Genetics
Ehlers-Danlos syndrome, spondylodysplastic type
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

B4GALT7 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.10048148).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
B4GALT7	NM_007255.3 link	c.7C>T	p.Pro3Ser	missense_variant	Exon 1 of 6	ENST00000029410.10	NP_009186.1	Q9UBV7
B4GALT7	XM_047416681.1 link	c.-1104C>T		5_prime_UTR_variant	Exon 1 of 7		XP_047272637.1
B4GALT7	XM_047416682.1 link	c.-389C>T		5_prime_UTR_variant	Exon 1 of 7		XP_047272638.1
B4GALT7	XM_047416680.1 link	c.-2269C>T		upstream_gene_variant			XP_047272636.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
B4GALT7	ENST00000029410.10 link	c.7C>T	p.Pro3Ser	missense_variant	Exon 1 of 6	1	NM_007255.3	ENSP00000029410.5		Q9UBV7

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152012

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:

0.000103

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00

AC:

AN:

68996

AF XY:

0.00

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000960

AC:

119

AN:

1239754

Hom.:

Cov.:

AF XY:

0.0000873

AC XY:

AN XY:

607368

show subpopulations

African (AFR)

AF:

0.0000390

AC:

AN:

25652

American (AMR)

AF:

0.00

AC:

AN:

22698

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

21184

East Asian (EAS)

AF:

0.00

AC:

AN:

27484

South Asian (SAS)

AF:

0.00

AC:

AN:

60886

European-Finnish (FIN)

AF:

0.0000673

AC:

AN:

29720

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3572

European-Non Finnish (NFE)

AF:

0.000110

AC:

110

AN:

998486

Other (OTH)

AF:

0.000120

AC:

AN:

50072

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152012

Hom.:

Cov.:

AF XY:

0.0000539

AC XY:

AN XY:

74228

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41430

American (AMR)

AF:

0.00

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5170

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10556

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

67964

Other (OTH)

AF:

0.00

AC:

AN:

2088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.518

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000529

ExAC

AF:

0.0000114

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Ehlers-Danlos syndrome progeroid type

Uncertain:1

Aug 09, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 3 of the B4GALT7 protein (p.Pro3Ser). This variant is present in population databases (rs749515076, gnomAD 0.005%). This variant has not been reported in the literature in individuals affected with B4GALT7-related conditions. ClinVar contains an entry for this variant (Variation ID: 1443885). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Jun 27, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis indicates that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.071

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.44

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.019

Eigen

Benign

-0.51

Eigen_PC

Benign

-0.31

FATHMM_MKL

Benign

0.47

LIST_S2

Benign

0.65

M_CAP

Uncertain

0.26

MetaRNN

Benign

0.10

MetaSVM

Benign

-0.96

MutationAssessor

Benign

0.86

PhyloP100

0.46

PrimateAI

Pathogenic

0.82

PROVEAN

Benign

-0.66

REVEL

Benign

0.078

Sift

Benign

0.61

Sift4G

Benign

0.49

Polyphen

0.0010

Vest4

0.12

MutPred

0.26

Gain of phosphorylation at P3 (P = 0.0081);

MVP

0.73

MPC

0.15

ClinPred

0.21

GERP RS

3.3

PromoterAI

0.062

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.062

gMVP

0.43

Mutation Taster

=85/15

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

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chr5-177600217-C-T

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