16-66566742-C-G

Position:

• chr16-66566742-C-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_052999.4(CMTM1):​c.229C>G​(p.Pro77Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,461,618 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: CMTM1 NM_052999.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.14

Genes affected

CMTM1 (HGNC:19172): (CKLF like MARVEL transmembrane domain containing 1) This gene belongs to the chemokine-like factor gene superfamily, a novel family that is similar to the chemokine and the transmembrane 4 superfamilies of signaling molecules. The protein encoded by this gene may play an important role in testicular development. Alternatively spliced transcript variants encoding different isoforms have been identified. Naturally occurring read-through transcription occurs between this locus and the neighboring locus CKLF (chemokine-like factor).[provided by RefSeq, Feb 2011]

CKLF-CMTM1 (HGNC:39977): (CKLF-CMTM1 readthrough) This locus represents naturally occurring read-through transcription between the neighboring CKLF (chemokine-like factor) and CMTM1 (CKLF-like MARVEL transmembrane domain containing 1) genes on chromosome 16. The read-through transcript produces a fusion protein that shares sequence identity with each individual gene product. [provided by RefSeq, Feb 2011]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.05949855).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CMTM1	NM_052999.4	c.229C>G	p.Pro77Ala	missense_variant	1/4	ENST00000379500.7	NP_443725.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CMTM1	ENST00000379500.7	c.229C>G	p.Pro77Ala	missense_variant	1/4	1	NM_052999.4	ENSP00000368814.2
CKLF-CMTM1	ENST00000616804.5	c.237+8394C>G		intron_variant		2		ENSP00000479319.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1461618 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727094

Gnomad4 AFR exome AF: 0.0000299

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: 0.00000360

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 31

Bravo AF: 0.0000151

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

Oct 04, 2024

The c.229C>G (p.P77A) alteration is located in exon 1 (coding exon 1) of the CMTM1 gene. This alteration results from a C to G substitution at nucleotide position 229, causing the proline (P) at amino acid position 77 to be replaced by an alanine (A). 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
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.74
CADD	Benign	4.4
DANN	Benign	0.89
DEOGEN2	Benign	0.021	T;.;.
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.011	N
LIST_S2	Benign	0.56	T;T;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.059	T;T;T
MetaSVM	Benign	-1.1	T
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-1.9	N;N;N
REVEL	Benign	0.014
Sift	Benign	0.069	T;D;D
Sift4G	Benign	0.24	T;T;T
Polyphen		0.018	B;.;B
Vest4		0.050
MutPred		0.15		Loss of glycosylation at P77 (P = 0.0259);Loss of glycosylation at P77 (P = 0.0259);Loss of glycosylation at P77 (P = 0.0259);
MVP		0.040
MPC		0.93
ClinPred		0.22	T
GERP RS		-3.6
gMVP		0.079

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: rs992537787; hg19: chr16-66600645;