NM_130468.4:c.2T>C

Variant names:

• chr15-40471215-T-C
• NM_130468.4:c.2T>C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Supporting PM2 PP5

The NM_130468.4(CHST14):​c.2T>C​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000691 in 1,157,022 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000069 (0 hom.)
• Consequence: CHST14 NM_130468.4 start_lost
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 1.80

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 4 ACMG points.

• PVS1: Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 44 codons. Genomic position: 40471343. Lost 0.115 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-40471215-T-C is Pathogenic according to our data. Variant chr15-40471215-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 2004232.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHST14	NM_130468.4	c.2T>C	p.Met1?	start_lost	Exon 1 of 1	ENST00000306243.7	NP_569735.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHST14	ENST00000306243.7	c.2T>C	p.Met1?	start_lost	Exon 1 of 1	6	NM_130468.4	ENSP00000307297.6
CHST14	ENST00000559991.1	c.2T>C	p.Met1?	start_lost	Exon 1 of 2	5		ENSP00000453882.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000691 AC: 8 AN: 1157022 Hom.: 0 Cov.: 32 AF XY: 0.00000533 AC XY: 3 AN XY: 563284

Gnomad4 AFR exome AF: 0.0000469

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: 0.00000624

Gnomad4 OTH exome AF: 0.0000220

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1

Oct 02, 2023

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; Not observed at significant frequency in large population cohorts (gnomAD); Initiation codon variant in a gene for which loss of function is a known mechanism of disease -

Ehlers-Danlos syndrome, musculocontractural type Uncertain:1

Aug 10, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 2004232). 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. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant has not been reported in the literature in individuals affected with CHST14-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the CHST14 mRNA. The next in-frame methionine is located at codon 44. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.59	D
BayesDel_noAF	Benign	-0.090
CADD	Benign	22
DANN	Benign	0.93
DEOGEN2	Benign	0.018	T;.
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.42
FATHMM_MKL	Benign	0.32	N
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.99	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Benign	-0.72	T
PROVEAN	Benign	-0.25	N;N
REVEL	Uncertain	0.37
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.0040	B;.
Vest4		0.51
MutPred		0.98		Gain of phosphorylation at M1 (P = 0.0043);Gain of phosphorylation at M1 (P = 0.0043);
MVP		0.75
ClinPred		0.82	D
GERP RS		2.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.64
gMVP		0.67

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr15-40763414;