Genetic Variant C1GALT1C1:p.His171Gln (chrX-120626654-G-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_001011551.3(C1GALT1C1):c.513C>A(p.His171Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000108 in 1,207,282 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 7 hemizygotes in GnomAD. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 2 hem., cov: 24)

Exomes 𝑓: 0.000010 ( 0 hom. 5 hem. )

Consequence

C1GALT1C1
NM_001011551.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.441

Variant links:

Genes affected

C1GALT1C1 (HGNC:24338): (C1GALT1 specific chaperone 1) This gene encodes a type II transmembrane protein that is similar to the core 1 beta1,3-galactosyltransferase 1, which catalyzes the synthesis of the core-1 structure, also known as Thomsen-Friedenreich antigen, on O-linked glycans. This gene product lacks the galactosyltransferase activity itself, but instead acts as a molecular chaperone required for the folding, stability and full activity of the core 1 beta1,3-galactosyltransferase 1. Mutations in this gene have been associated with Tn syndrome. Alternatively spliced transcript variants encoding the same protein have been identified. [provided by RefSeq, Dec 2009]

C1GALT1C1 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High Hemizygotes in GnomAd4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
C1GALT1C1	NM_001011551.3 link	c.513C>A	p.His171Gln	missense_variant	Exon 2 of 2	ENST00000304661.6	NP_001011551.1	Q96EU7
C1GALT1C1	NM_152692.5 link	c.513C>A	p.His171Gln	missense_variant	Exon 3 of 3		NP_689905.1	Q96EU7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
C1GALT1C1	ENST00000304661.6 link	c.513C>A	p.His171Gln	missense_variant	Exon 2 of 2	1	NM_001011551.3	ENSP00000304364.5		Q96EU7
C1GALT1C1	ENST00000371313.2 link	c.513C>A	p.His171Gln	missense_variant	Exon 3 of 3	1		ENSP00000360363.2		Q96EU7

Frequencies

GnomAD3 genomes

AF:

0.0000179

AC:

AN:

111939

Hom.:

Cov.:

AF XY:

0.0000586

AC XY:

AN XY:

34131

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:

0.0000376

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

180159

Hom.:

AF XY:

0.0000616

AC XY:

AN XY:

64923

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:

0.0000619

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000100

AC:

AN:

1095343

Hom.:

Cov.:

AF XY:

0.0000138

AC XY:

AN XY:

361097

show subpopulations

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:

0.0000131

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000179

AC:

AN:

111939

Hom.:

Cov.:

AF XY:

0.0000586

AC XY:

AN XY:

34131

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:

0.0000376

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.0000227

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000297

AC:

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 08, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.513C>A (p.H171Q) alteration is located in exon 3 (coding exon 1) of the C1GALT1C1 gene. This alteration results from a C to A substitution at nucleotide position 513, causing the histidine (H) at amino acid position 171 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.29

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Benign

-0.27

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.44

T;T

FATHMM_MKL

Uncertain

0.83

LIST_S2

Benign

0.76

.;T

M_CAP

Benign

0.019

MetaRNN

Uncertain

0.71

D;D

MetaSVM

Benign

-0.90

MutationAssessor

Benign

1.8

L;L

PrimateAI

Uncertain

0.62

PROVEAN

Pathogenic

-5.0

D;D

REVEL

Benign

0.22

Sift

Benign

0.21

T;T

Sift4G

Uncertain

0.054

T;T

Polyphen

0.98

D;D

Vest4

0.54

MutPred

0.45

Loss of catalytic residue at H171 (P = 0.0265);Loss of catalytic residue at H171 (P = 0.0265);

MVP

0.69

MPC

0.39

ClinPred

0.60

GERP RS

3.2

Varity_R

0.58

gMVP

0.78

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