16-71537554-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001166395.2(CHST4):c.877T>C(p.Phe293Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,878 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: CHST4 NM_001166395.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.02

Genes affected

CHST4 (HGNC:1972): (carbohydrate sulfotransferase 4) This gene encodes an N-acetylglucosamine 6-O sulfotransferase. The encoded enzyme transfers sulfate from 3'phosphoadenosine 5'phospho-sulfate to the 6-hydroxyl group of N-acetylglucosamine on glycoproteins. This protein is localized to the Golgi and is involved in the modification of glycan structures on ligands of the lymphocyte homing receptor L-selectin. Alternate splicing in the 5' UTR results in multiple transcript variants that encode the same protein. [provided by RefSeq, Oct 2009]

ZNF19 (HGNC:12981): (zinc finger protein 19) The protein encoded by this gene contains a zinc finger, a nucleic acid-binding domain present in many transcription factors. This gene is located in a region next to ZNF23, a gene also encoding a zinc finger protein, on chromosome 16. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.976

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHST4	NM_001166395.2	c.877T>C	p.Phe293Leu	missense_variant	2/2	ENST00000539698.4
CHST4	NM_005769.2	c.877T>C	p.Phe293Leu	missense_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHST4	ENST00000539698.4	c.877T>C	p.Phe293Leu	missense_variant	2/2	1	NM_001166395.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461878 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727244

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: 0.00000809

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

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 25, 2023

The c.877T>C (p.F293L) alteration is located in exon 2 (coding exon 1) of the CHST4 gene. This alteration results from a T to C substitution at nucleotide position 877, causing the phenylalanine (F) at amino acid position 293 to be replaced by a leucine (L). 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	Pathogenic	0.89
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
Cadd	Benign	22
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.88	D;D
Eigen	Uncertain	0.67
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.96	D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Uncertain	0.73	D
MutationAssessor	Pathogenic	3.0	M;M
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.44	T
PROVEAN	Pathogenic	-5.9	D;D
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0040	D;D
Sift4G	Uncertain	0.0060	D;D
Polyphen		1.0	D;D
Vest4		0.57
MutPred		0.87		Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);
MVP		0.95
MPC		0.58
ClinPred		0.99	D
GERP RS		6.0
Varity_R		0.38
gMVP		0.62

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: rs909489388; hg19: chr16-71571457;