Genetic Variant SLC35C1:c.-481G>A (chr11-45805321-G-A) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_001425156.1(SLC35C1):c.-32+5G>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000685 in 1,022,076 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000034 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000074 ( 0 hom. )

Consequence

SLC35C1
NM_001425156.1 splice_region, intron

Scores

Splicing: ADA: 0.0002460

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.223

Variant links:

Genes affected

SLC35C1 (HGNC:20197): (solute carrier family 35 member C1) This gene encodes a GDP-fucose transporter that is found in the Golgi apparatus. Mutations in this gene result in congenital disorder of glycosylation type IIc. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2009]

SLC35C1 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.76).

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.0000743 (65/875282) while in subpopulation NFE AF= 0.0000816 (64/784712). AF 95% confidence interval is 0.0000653. There are 0 homozygotes in gnomad4_exome. There are 30 alleles in male gnomad4_exome subpopulation. Median coverage is 29. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC35C1	NM_018389.5 link	c.-481G>A		5_prime_UTR_variant	Exon 1 of 2	ENST00000314134.4	NP_060859.4	Q96A29-1B3KQH0

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
SLC35C1	ENST00000314134 link	c.-481G>A	5_prime_UTR_variant	Exon 1 of 2	1	NM_018389.5	ENSP00000313318.3	Q96A29-1
SLC35C1	ENST00000442528.2 link	c.-31-489G>A	intron_variant	Intron 1 of 2	1		ENSP00000412408.2	Q96A29-2
SLC35C1	ENST00000526817.2 link	c.-31-489G>A	intron_variant	Intron 1 of 2	2		ENSP00000432145.2	Q96A29-2E9PS26
SLC35C1	ENST00000530471.1 link	c.-32+5G>A	splice_region_variant, intron_variant	Intron 1 of 1	3		ENSP00000432669.1	E9PPI4

Frequencies

GnomAD3 genomes

AF:

0.0000341

AC:

AN:

146794

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000254

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:

0.0000599

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000743

AC:

AN:

875282

Hom.:

Cov.:

AF XY:

0.0000735

AC XY:

AN XY:

408266

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:

0.0000816

Gnomad4 OTH exome

AF:

0.0000341

GnomAD4 genome

AF:

0.0000341

AC:

AN:

146794

Hom.:

Cov.:

AF XY:

0.0000701

AC XY:

AN XY:

71310

show subpopulations

Gnomad4 AFR

AF:

0.0000254

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:

0.0000599

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Leukocyte adhesion deficiency type II

Uncertain:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.76

CADD

Benign

DANN

Benign

0.63

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00025

dbscSNV1_RF

Benign

0.0

SpliceAI score (max)

0.010

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