NM_178232.4:c.791T>C

Variant names:

• chr15-88878972-A-G
• rs1212209034
• NM_178232.4:c.791T>C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_178232.4(HAPLN3):​c.791T>C​(p.Leu264Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,456,142 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: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: HAPLN3 NM_178232.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.11

Genes affected

HAPLN3 (HGNC:21446): (hyaluronan and proteoglycan link protein 3) This gene belongs to the hyaluronan and proteoglycan binding link protein gene family. The protein encoded by this gene may function in hyaluronic acid binding and cell adhesion. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.758

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HAPLN3	NM_178232.4	c.791T>C	p.Leu264Pro	missense_variant	Exon 4 of 5	ENST00000359595.8	NP_839946.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HAPLN3	ENST00000359595.8	c.791T>C	p.Leu264Pro	missense_variant	Exon 4 of 5	1	NM_178232.4	ENSP00000352606.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1456142 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 723952

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: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jan 09, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.791T>C (p.L264P) alteration is located in exon 4 (coding exon 3) of the HAPLN3 gene. This alteration results from a T to C substitution at nucleotide position 791, causing the leucine (L) at amino acid position 264 to be replaced by a proline (P). 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
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.034	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.24	T;.
Eigen	Benign	-0.021
Eigen_PC	Benign	0.031
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.62	T;T
M_CAP	Benign	0.012	T
MetaRNN	Pathogenic	0.76	D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Pathogenic	3.1	M;.
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-4.7	D;D
REVEL	Benign	0.18
Sift	Uncertain	0.0020	D;D
Sift4G	Uncertain	0.0020	D;D
Polyphen		0.11	B;.
Vest4		0.66
MutPred		0.72		Loss of sheet (P = 0.007);.;
MVP		0.30
MPC		0.36
ClinPred		0.99	D
GERP RS		3.1
Varity_R		0.67
gMVP		0.88

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: rs1212209034; hg19: chr15-89422203;