15-40471272-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_130468.4(CHST14):c.59G>C(p.Arg20Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000742 in 1,348,298 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R20W) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.4e-7 (0 hom.)
• Consequence: CHST14 NM_130468.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.85

Genes affected

CHST14 (HGNC:24464): (carbohydrate sulfotransferase 14) This gene encodes a member of the HNK-1 family of sulfotransferases. The encoded protein transfers sulfate to the C-4 hydroxyl of N-acetylgalactosamine residues in dermatan sulfate. Mutations in this gene have been associated with adducted thumb-clubfoot syndrome.[provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3522087).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHST14	NM_130468.4	c.59G>C	p.Arg20Pro	missense_variant	1/1	ENST00000306243.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHST14	ENST00000306243.7	c.59G>C	p.Arg20Pro	missense_variant	1/1		NM_130468.4	P1
CHST14	ENST00000559991.1	c.59G>C	p.Arg20Pro	missense_variant	1/2	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.42e-7 AC: 1 AN: 1348298 Hom.: 0 Cov.: 32 AF XY: 0.00000150 AC XY: 1 AN XY: 665270

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: 9.39e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 24, 2021

The p.R20P variant (also known as c.59G>C), located in coding exon 1 of the CHST14 gene, results from a G to C substitution at nucleotide position 59. The arginine at codon 20 is replaced by proline, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.060
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
Cadd	Uncertain	25
Dann	Uncertain	0.99
DEOGEN2	Benign	0.019	T;.
Eigen	Benign	0.14
Eigen_PC	Benign	0.19
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.56	T;T
M_CAP	Pathogenic	0.56	D
MetaRNN	Benign	0.35	T;T
MetaSVM	Benign	-0.69	T
MutationAssessor	Benign	0.0	N;.
MutationTaster	Benign	0.77	N;N
PrimateAI	Pathogenic	0.90	D
PROVEAN	Benign	-0.34	N;N
REVEL	Uncertain	0.34
Sift	Pathogenic	0.0	D;D
Sift4G	Benign	0.33	T;T
Polyphen		0.94	P;.
Vest4		0.31
MutPred		0.32		Gain of loop (P = 3e-04);Gain of loop (P = 3e-04);
MVP		0.68
MPC		1.7
ClinPred		0.58	D
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.39
gMVP		0.42

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

Other links and lift over

dbSNP: rs1894339599; hg19: chr15-40763471;