chr8-93754957-T-A

Position:

• chr8-93754957-T-A

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP6

The NM_153704.6(TMEM67):​c.43T>A​(p.Ser15Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000123 in 1,461,846 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. S15S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: TMEM67 NM_153704.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:1
• Conservation: PhyloP100: -0.0130

Genes affected

TMEM67 (HGNC:28396): (transmembrane protein 67) The protein encoded by this gene localizes to the primary cilium and to the plasma membrane. The gene functions in centriole migration to the apical membrane and formation of the primary cilium. Multiple transcript variants encoding different isoforms have been found for this gene. Defects in this gene are a cause of Meckel syndrome type 3 (MKS3) and Joubert syndrome type 6 (JBTS6). [provided by RefSeq, Nov 2008]

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08945152).
• BP6: Variant 8-93754957-T-A is Benign according to our data. Variant chr8-93754957-T-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 928828.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TMEM67	NM_153704.6	c.43T>A	p.Ser15Thr	missense_variant	1/28	ENST00000453321.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TMEM67	ENST00000453321.8	c.43T>A	p.Ser15Thr	missense_variant	1/28	1	NM_153704.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000835 AC: 21 AN: 251436 Hom.: 0 AF XY: 0.0000662 AC XY: 9 AN XY: 135904

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000607

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000123 AC: 18 AN: 1461846 Hom.: 0 Cov.: 31 AF XY: 0.00000963 AC XY: 7 AN XY: 727222

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000402

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ExAC AF: 0.0000659 AC: 8

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Aug 19, 2020

Variant summary: TMEM67 c.43T>A (p.Ser15Thr) results in a conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 8.4e-05 in 251436 control chromosomes, predominantly at a frequency of 0.00061 within the Latino subpopulation in the gnomAD database. This frequency is lower than the estimated maximum allele frequency expected for a pathogenic variant in TMEM67 causing Joubert Syndrome 6 (0.00061 vs 0.004), allowing no conclusion about variant significance. To our knowledge, no occurrence of c.43T>A in individuals affected with Joubert Syndrome 6 and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Meckel syndrome, type 3;C1853153:Joubert syndrome 6;C1865794:RHYNS syndrome;C2673874:Bardet-Biedl syndrome 14;C3150796:Nephronophthisis 11;C5435651:COACH syndrome 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 20, 2021

- -

Meckel-Gruber syndrome;C0431399:Familial aplasia of the vermis Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Sep 12, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Uncertain	-0.040
CADD	Benign	2.1
DANN	Benign	0.83
DEOGEN2	Benign	0.074	T;.
Eigen	Benign	-0.65
Eigen_PC	Benign	-0.80
FATHMM_MKL	Benign	0.067	N
LIST_S2	Benign	0.47	T;T
M_CAP	Benign	0.039	D
MetaRNN	Benign	0.089	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.1	M;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-0.16	N;N
REVEL	Benign	0.24
Sift	Benign	0.17	T;T
Sift4G	Benign	0.89	T;T
Polyphen		0.0010	B;.
Vest4		0.13
MutPred		0.46		Loss of MoRF binding (P = 0.1233);Loss of MoRF binding (P = 0.1233);
MVP		0.96
MPC		0.11
ClinPred		0.061	T
GERP RS		-0.19
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.071
gMVP		0.47

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: rs748221725; hg19: chr8-94767185;