chr6-116125413-A-C

Position:

• chr6-116125413-A-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PP3_Moderate BS1_Supporting BS2

The NM_000493.4(COL10A1):​c.80T>G​(p.Met27Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000103 in 1,461,588 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 13/21 in silico tools predict 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. M27T) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: COL10A1 NM_000493.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.72

Genes affected

COL10A1 (HGNC:2185): (collagen type X alpha 1 chain) This gene encodes the alpha chain of type X collagen, a short chain collagen expressed by hypertrophic chondrocytes during endochondral ossification. Unlike type VIII collagen, the other short chain collagen, type X collagen is a homotrimer. Mutations in this gene are associated with Schmid type metaphyseal chondrodysplasia (SMCD) and Japanese type spondylometaphyseal dysplasia (SMD). [provided by RefSeq, Jul 2008]

NT5DC1 (HGNC:21556): (5'-nucleotidase domain containing 1) While the exact function of the protein encoded by this gene is not known, it belongs to the 5'(3')-deoxyribonucleotidase family. [provided by RefSeq, May 2010]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.856
• BS1: Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.0000103 (15/1461588) while in subpopulation EAS AF= 0.000378 (15/39632). AF 95% confidence interval is 0.000233. There are 0 homozygotes in gnomad4_exome. There are 8 alleles in male gnomad4_exome subpopulation. Median coverage is 38. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High AC in GnomAdExome4 at 15 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL10A1	NM_000493.4	c.80T>G	p.Met27Arg	missense_variant	2/3	ENST00000651968.1
NT5DC1	NM_152729.3	c.529+7468A>C		intron_variant		ENST00000319550.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL10A1	ENST00000651968.1	c.80T>G	p.Met27Arg	missense_variant	2/3		NM_000493.4	P1
NT5DC1	ENST00000319550.9	c.529+7468A>C		intron_variant		1	NM_152729.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000103 AC: 15 AN: 1461588 Hom.: 0 Cov.: 38 AF XY: 0.0000110 AC XY: 8 AN XY: 727098

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000378

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

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

Metaphyseal chondrodysplasia, Schmid type Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

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
AlphaMissense	Benign	0.082
BayesDel_addAF	Uncertain	0.061	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	16
DANN	Benign	0.93
DEOGEN2	Benign	0.22	T;T;.;.
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.31
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.20	T;.;T;T
M_CAP	Benign	0.061	D
MetaRNN	Pathogenic	0.86	D;D;D;D
MetaSVM	Benign	-0.74	T
MutationAssessor	Benign	0.0	N;N;.;.
MutationTaster	Benign	0.010	P;P;P
PrimateAI	Benign	0.47	T
PROVEAN	Benign	0.41	N;N;N;N
REVEL	Uncertain	0.33
Sift	Benign	0.15	T;T;D;D
Sift4G	Benign	0.67	T;T;.;.
Polyphen		0.0	B;B;.;.
Vest4		0.17
MutPred		0.73		Gain of disorder (P = 0.0466);Gain of disorder (P = 0.0466);Gain of disorder (P = 0.0466);Gain of disorder (P = 0.0466);
MVP		0.86
MPC		0.0076
ClinPred		0.74	D
GERP RS		6.1
Varity_R		0.19
gMVP		0.55

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: rs1064583; hg19: chr6-116446576;