rs1648924366

Variant names:

• chr1-100874247-G-A
• rs1648924366
• NM_001033025.3:c.688C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001033025.3(EXTL2):​c.688C>T​(p.Pro230Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,682 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: 6.8e-7 (0 hom.)
• Consequence: EXTL2 NM_001033025.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.76
• Publications: 0 publications found

Genes affected

EXTL2 (HGNC:3516): (exostosin like glycosyltransferase 2) Enables alpha-1,4-N-acetylgalactosaminyltransferase activity and glucuronyl-galactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase activity. Involved in N-acetylglucosamine metabolic process and UDP-N-acetylgalactosamine metabolic process. Located in cytosol; endoplasmic reticulum; and nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.971

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001033025.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EXTL2	NM_001033025.3	MANE Select	c.688C>T	p.Pro230Ser	missense	Exon 5 of 5	NP_001028197.1	Q9UBQ6
	EXTL2	NM_001261441.2		c.712C>T	p.Pro238Ser	missense	Exon 6 of 6	NP_001248370.1
	EXTL2	NM_001439.4		c.688C>T	p.Pro230Ser	missense	Exon 5 of 5	NP_001430.1	Q9UBQ6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EXTL2	ENST00000370114.8	TSL:1 MANE Select	c.688C>T	p.Pro230Ser	missense	Exon 5 of 5	ENSP00000359132.3	Q9UBQ6
	EXTL2	ENST00000370113.7	TSL:1	c.688C>T	p.Pro230Ser	missense	Exon 5 of 5	ENSP00000359131.3	Q9UBQ6
	EXTL2	ENST00000886545.1		c.712C>T	p.Pro238Ser	missense	Exon 6 of 6	ENSP00000556603.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460682 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726630

African (AFR) AF: 0.00 AC: 0 AN: 33422

American (AMR) AF: 0.00 AC: 0 AN: 44542

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26094

East Asian (EAS) AF: 0.00 AC: 0 AN: 39658

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86188

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53340

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5738

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111400

Other (OTH) AF: 0.00 AC: 0 AN: 60300

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.26
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.67	D
Eigen	Pathogenic	0.76
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.064	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	-0.011	T
MutationAssessor	Uncertain	2.9	M
PhyloP100		7.8
PrimateAI	Uncertain	0.49	T
PROVEAN	Pathogenic	-7.2	D
REVEL	Pathogenic	0.72
Sift	Benign	0.052	T
Sift4G	Benign	0.12	T
Polyphen		0.96	D
Vest4		0.60
MutPred		0.85		Loss of helix (P = 0.1706)
MVP		0.93
MPC		0.60
ClinPred		1.0	D
GERP RS		6.0
Varity_R		0.50
gMVP		0.66
Mutation Taster		=36/64	disease causing

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

Other links and lift over

dbSNP: rs1648924366; hg19: chr1-101339803;