rs765907815

Positions:

• chr11-123083728-G-A
• chr11-123083728-G-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_024769.5(CLMP):​c.508C>T​(p.Arg170*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000123 in 1,461,832 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 Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: CLMP NM_024769.5 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 1.19

Genes affected

CLMP (HGNC:24039): (CXADR like membrane protein) This gene encodes a type I transmembrane protein that is localized to junctional complexes between endothelial and epithelial cells and may have a role in cell-cell adhesion. Expression of this gene in white adipose tissue is implicated in adipocyte maturation and development of obesity. This gene is also essential for normal intestinal development and mutations in the gene are associated with congenital short bowel syndrome. [provided by RefSeq, Aug 2015]

CLMP (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-123083728-G-A is Pathogenic according to our data. Variant chr11-123083728-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 224071.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLMP	NM_024769.5	c.508C>T	p.Arg170*	stop_gained	4/7	ENST00000448775.4	NP_079045.1
LOC124902775	XR_007062927.1	n.1585G>A		non_coding_transcript_exon_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CLMP	ENST00000448775.4	c.508C>T	p.Arg170*	stop_gained	4/7	1	NM_024769.5	ENSP00000405577.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251452 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135900

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000123 AC: 18 AN: 1461832 Hom.: 0 Cov.: 31 AF XY: 0.00000688 AC XY: 5 AN XY: 727210

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: 0.0000144

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Congenital short bowel syndrome, autosomal recessive Pathogenic:1

Likely pathogenic, criteria provided, single submitter

curation

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Jan 25, 2023

The homozygous p.Arg170Ter variant in CLMP was identified by our study in one individual with anemia. The p.Arg170Ter variant in CLMP has been previously reported in 2 affected relatives from one family with congenital short bowel syndrome (PMID: 27352967) but has been identified in 0.0009% (1/113732) of European (non-Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs765907815). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. These affected individuals and the individual identified by our study were homozygotes, which increases the likelihood that the p.Arg170Ter variant is pathogenic. This variant has also been reported in ClinVar (Variation ID: 224071) and has been interpreted as pathogenic by Clinical Genetics, Erasmus University Medical Center and OMIM. This nonsense variant leads to a premature termination codon at position 170, which is predicted to lead to a truncated or absent protein. Loss of function of the CLMP gene is strongly associated to congenital short bowel syndrome. In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic for autosomal recessive congenital short bowel syndrome. ACMG/AMP Criteria applied: PVS1_Strong, PM2_Supporting, PM3 (Richards 2015). -

Intestinal pseudo-obstruction Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Clinical Genetics, Erasmus University Medical Center

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- -

Congenital short bowel syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Mar 10, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.29
CADD	Pathogenic	36
DANN	Uncertain	1.0
Eigen	Uncertain	0.36
Eigen_PC	Benign	0.078
FATHMM_MKL	Benign	0.015	N
Vest4		0.72
GERP RS		2.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs765907815; hg19: chr11-122954436; COSMIC: COSV101507384;